HYDROcodone bitartrate 2.5 MG / acetaminophen 500 MG Oral Tablet

WARNINGS

Respiratory Depression: At high doses or in sensitive patients, hydrocodone may produce dose-related respiratory depression by acting directly on the brain stem respiratory center.

Hydrocodone also affects the center that controls respiratory rhythm, and may produce irregular and periodic breathing.

Head Injury and Increased Intracranial Pressure: The respiratory depressant effects of narcotics and their capacity to elevate cerebrospinal fluid pressure may be markedly exaggerated in the presence of head injury, other intracranial lesions or a preexisting increase in intracranial pressure.

Furthermore, narcotics produce adverse reactions which may obscure the clinical course of patients with head injuries.

Acute Abdominal Conditions: The administration of narcotics may obscure the diagnosis or clinical course of patients with acute abdominal conditions.

Misuse, Abuse, and Diversion of Opioids: Hydrocodone bitartrate and acetaminophen tablets contain hydrocodone, an opioid agonist, and is a Schedule III controlled substance.

Opioid agonists have the potential for being abused and are sought by abusers and people with addiction disorders, and are subject to diversion.

Hydrocodone bitartrate and acetaminophen tablets can be abused in a manner similar to other opioid agonists, legal or illicit.

This should be considered when prescribing or dispensing hydrocodone bitartrate and acetaminophen tablets in situations where the physician or pharmacist is concerned about an increased risk of misuse, abuse or diversion (see DRUG ABUSE AND DEPENDENCE ).

DRUG INTERACTIONS

Drug Interactions: Patients receiving other narcotic analgesics, antihistamines, antipsychotics, antianxiety agents, or other CNS depressants (including alcohol) concomitantly with hydrocodone bitartrate and acetaminophen tablets may exhibit an additive CNS depression.

When combined therapy is contemplated, the dose of one or both agents should be reduced.

The use of MAO inhibitors or tricyclic antidepressants with hydrocodone preparations may increase the effect of either the antidepressant or hydrocodone.

OVERDOSAGE

Following an acute overdosage, toxicity may result from hydrocodone or acetaminophen.

Signs and Symptoms: Hydrocodone: Serious overdose with hydrocodone is characterized by respiratory depression (a decrease in respiratory rate and/or tidal volume, Cheyne-Stokes respiration, cyanosis), extreme somnolence progressing to stupor or coma, skeletal muscle flaccidity, cold and clammy skin, and sometimes bradycardia and hypotension.

In severe overdosage, apnea, circulatory collapse, cardiac arrest and death may occur.

Acetaminophen: In acetaminophen overdosage: dose-dependent, potentially fatal hepatic necrosis is the most serious adverse effect.

Renal tubular necrosis, hypoglycemic coma, and thrombocytopenia may also occur.

Early symptoms following a potentially hepatotoxic overdose may include: nausea, vomiting, diaphoresis and general malaise.

Clinical and laboratory evidence of hepatic toxicity may not be apparent until 48 to 72 hours post-ingestion.

In adults, hepatic toxicity has rarely been reported with acute overdoses of less than 10 grams, or fatalities with less than 15 grams.

Treatment: A single or multiple overdose with hydrocodone and acetaminophen is a potentially lethal polydrug overdose, and consultation with a regional poison control center is recommended.

Immediate treatment includes support of cardiorespiratory function and measures to reduce drug absorption.

Vomiting should be induced mechanically, or with syrup of ipecac, if the patient is alert (adequate pharyngeal and laryngeal reflexes).

Oral activated charcoal (1 g/kg) should follow gastric emptying.

The first dose should be accompanied by an appropriate cathartic.

If repeated doses are used, the cathartic might be included with alternate doses as required.

Hypotension is usually hypovolemic and should respond to fluids.

Vasopressors and other supportive measures should be employed as indicated.

A cuffed endotracheal tube should be inserted before gastric lavage of the unconscious patient and, when necessary, to provide assisted respiration.

Meticulous attention should be given to maintaining adequate pulmonary ventilation.

In severe cases of intoxication, peritoneal dialysis, or preferably hemodialysis may be considered.

If hypoprothrombinemia occurs due to acetaminophen overdose, vitamin K should be administered intravenously.

Naloxone, a narcotic antagonist, can reverse respiratory depression and coma associated with opioid overdose.

Naloxone hydrochloride 0.4 mg to 2 mg is given parenterally.

Since the duration of action of hydrocodone may exceed that of the naloxone, the patient should be kept under continuous surveillance and repeated doses of the antagonist should be administered as needed to maintain adequate respiration.

A narcotic antagonist should not be administered in the absence of clinically significant respiratory or cardiovascular depression.

If the dose of acetaminophen may have exceeded 140 mg/kg, acetylcysteine should be administered as early as possible.

Serum acetaminophen levels should be obtained, since levels four or more hours following ingestion help predict acetaminophen toxicity.

Do not await acetaminophen assay results before initiating treatment.

Hepatic enzymes should be obtained initially, and repeated at 24-hour intervals.

Methemoglobinemia over 30% should be treated with methylene blue by slow intravenous administration.

The toxic dose for acetaminophen for adults is 10 g.

DESCRIPTION

Hydrocodone bitartrate and acetaminophen is supplied in tablet form for oral administration.

Hydrocodone bitartrate is an opioid analgesic and antitussive and occurs as fine, white crystals or as a crystalline powder.

It is affected by light.

The chemical name is 4,5α-epoxy-3-methoxy-17-methylmorphinan-6-one tartrate (1:1) hydrate (2:5).

It has the following structural formula: Acetaminophen, 4′-hydroxyacetanilide, a slightly bitter, white, odorless, crystalline powder, is a non-opiate, non-salicylate analgesic and antipyretic.

It has the following structural formula: Hydrocodone Bitartrate and Acetaminophen Tablets, USP 2.5 mg/500 mg Each tablet contains: Hydrocodone Bitartrate ………….

2.5 mg Acetaminophen …………………….

500 mg In addition each tablet contains the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, crospovidone, FD&C Red #3, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized corn starch, stearic acid, and sucrose.

Meets USP Dissolution Test 1.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 5 mg/325 mg Each tablet contains: Hydrocodone Bitartrate ……………..

5 mg Acetaminophen ………………………..

325 mg In addition, each tablet contains the following inactive ingredients: croscarmellose sodium, lactose monohydrate, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized starch, sodium lauryl sulfate, stearic acid and sugar spheres which are composed of starch derived from corn, FD&C Red #40, FD&C Yellow #6, and sucrose.

Meets USP Dissolution Test 2.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 5 mg/500 mg Each tablet contains: Hydrocodone Bitartrate ………….

5 mg Acetaminophen …………………….

500 mg In addition each tablet contains the following inactive ingredients: hypromellose, lactose monohydrate, magnesium stearate, and sodium starch glycolate.

Meets USP Dissolution Test 1.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 7.5 mg/325 mg Each tablet contains: Hydrocodone Bitartrate ………….

7.5 mg Acetaminophen …………………….

325 mg In addition, each tablet contains the following inactive ingredients: croscarmellose sodium, FD&C Red #40 aluminum lake, FD&C Yellow #6 aluminum lake, lactose monohydrate, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized starch, sodium lauryl sulfate, stearic acid.

Meets USP Dissolution Test 2.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 7.5 mg/500 mg Each tablet contains: Hydrocodone Bitartrate ………….

7.5 mg Acetaminophen …………………….

500 mg In addition each tablet contains the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, crospovidone, FD&C Blue #1, FD&C Yellow #5, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized corn starch, stearic acid, and sucrose.

Meets USP Dissolution Test 1.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 7.5 mg/650 mg Each tablet contains: Hydrocodone Bitartrate ………….

7.5 mg Acetaminophen …………………….

650 mg In addition each tablet contains the following inactive ingredients: croscarmellose sodium, crospovidone, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized corn starch, and stearic acid.

Meets USP Dissolution Test 1.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 7.5 mg/750 mg Each tablet contains: Hydrocodone Bitartrate ………….

7.5 mg Acetaminophen …………………….

750 mg In addition each tablet contains the following inactive ingredients: croscarmellose sodium, crospovidone, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized corn starch, and stearic acid.

Meets USP Dissolution Test 1.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 10 mg/325 mg Each tablet contains: Hydrocodone Bitartrate …………

10 mg Acetaminophen …………………….

325 mg In addition each tablet contains the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, crospovidone, D&C Yellow #10 lake, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized corn starch, and stearic acid.

Meets USP Dissolution Test 1.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 10 mg/500 mg Each tablet contains: Hydrocodone Bitartrate …………

10 mg Acetaminophen …………………….

500 mg In addition each tablet contains the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, crospovidone, D&C Red #27 aluminum lake, D&C Red #30 aluminum lake, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized corn starch, and stearic acid.

Meets USP Dissolution Test 1.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 10 mg/650 mg Each tablet contains: Hydrocodone Bitartrate …………

10 mg Acetaminophen …………………….

650 mg In addition each tablet contains the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, crospovidone, FD&C Blue #1 aluminum lake, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized corn starch, and stearic acid.

Meets USP Dissolution Test 1.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 10 mg/660 mg Each tablet contains: Hydrocodone Bitartrate …………

10 mg Acetaminophen …………………….

660 mg In addition each tablet contains the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, crospovidone, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized corn starch, and stearic acid.

Meets USP Dissolution Test 1.

This is an image of the structural formula of Hydrocodone bitartrate.

This is an image of the structural formula of Acetaminophen.

HOW SUPPLIED

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 2.5 mg/500 mg are supplied as white with bright pink specks, capsule-shaped, scored tablets, debossed “3591” on one side and debossed “V” on the reverse side.

The tablets are supplied in containers of: 8 NDC 21695-579-08 16 NDC 21695-579-16 28 NDC 21695-579-28 30 NDC 21695-579-30 60 NDC 21695-579-60 Store at 20°-25°C (68°-77°F) [see USP Controlled Room Temperature].

Dispense in a tight, light-resistant container as defined in the USP/NF with a child-resistant closure.

A Schedule CIII Narcotic.

GERIATRIC USE

Geriatric Use: Clinical studies of hydrocodone bitartrate and acetaminophen tablets did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects.

Other reported clinical experience has not identified differences in responses between the elderly and younger patients.

In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy.

Hydrocodone and the major metabolites of acetaminophen are known to be substantially excreted by the kidney.

Thus the risk of toxic reactions may be greater in patients with impaired renal function due to the accumulation of the parent compound and/or metabolites in the plasma.

Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function.

Hydrocodone may cause confusion and over-sedation in the elderly; elderly patients generally should be started on low doses of hydrocodone bitartrate and acetaminophen tablets and observed closely.

INDICATIONS AND USAGE

Hydrocodone bitartrate and acetaminophen tablets are indicated for the relief of moderate to moderately severe pain.

PEDIATRIC USE

Pediatric Use: Safety and effectiveness in pediatric patients have not been established.

PREGNANCY

Pregnancy: Teratogenic Effects: Pregnancy Category C: There are no adequate and well-controlled studies in pregnant women.

Hydrocodone bitartrate and acetaminophen tablets should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Nonteratogenic Effects: Babies born to mothers who have been taking opioids regularly prior to delivery will be physically dependent.

The withdrawal signs include irritability and excessive crying, tremors, hyperactive reflexes, increased respiratory rate, increased stools, sneezing, yawning, vomiting, and fever.

The intensity of the syndrome does not always correlate with the duration of maternal opioid use or dose.

There is no consensus on the best method of managing withdrawal.

NUSRING MOTHERS

Nursing Mothers: Acetaminophen is excreted in breast milk in small amounts, but the significance of its effects on nursing infants is not known.

It is not known whether hydrocodone is excreted in human milk.

Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from hydrocodone and acetaminophen, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.

INFORMATION FOR PATIENTS

Information for Patients: Hydrocodone, like all narcotics, may impair the mental and/or physical abilities required for the performance of potentially hazardous tasks such as driving a car or operating machinery; patients should be cautioned accordingly.

Alcohol and other CNS depressants may produce an additive CNS depression, when taken with this combination product, and should be avoided.

Hydrocodone may be habit-forming.

Patients should take the drug only for as long as it is prescribed, in the amounts prescribed, and no more frequently than prescribed.

DOSAGE AND ADMINISTRATION

Dosage should be adjusted according to the severity of the pain and the response of the patient.

However, it should be kept in mind that tolerance to hydrocodone can develop with continued use and that the incidence of untoward effects is dose related.

Hydrocodone Bitartrate and Acetaminophen Tablets, USP 2.5 mg/500 mg The usual adult dosage is one or two tablets every four to six hours as needed for pain.

The total daily dosage should not exceed 8 tablets.

Plasma-Lyte R Multiple Electrolytes Injectable Solution

WARNINGS

PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) should be used with great care, if at all, in patients with congestive heart failure, severe renal insufficiency and in clinical states in which there exists edema with sodium retention.

PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) should be used with great care, if at all, in patients with hyperkalemia, severe renal failure and in conditions in which potassium retention is present.

PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) should be used with great care in patients with metabolic or respiratory alkalosis.

The administration of lactate or acetate ions should be done with great care in those conditions in which there is an increased level or an impaired utilization of these ions, such as severe hepatic insufficiency.

PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) should not be administered simultaneously with blood through the same administration set because of the likelihood of coagulation.

The intravenous administration of PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) can cause fluid and/or solute overloading resulting in dilution of serum electrolyte concentrations, overhydration, congested states or pulmonary edema.

The risk of dilutional states is inversely proportional to the electrolyte concentrations of the injection.

The risk of solute overload causing congested states with peripheral and pulmonary edema is directly proportional to the electrolyte concentrations of the injection.

In patients with diminished renal function, administration of PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) may result in sodium or potassium retention.

PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) is not for use in the treatment of lactic acidosis.

DESCRIPTION

PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) is a sterile, nonpyrogenic isotonic solution in a single dose container for intravenous administration.

Each 100 mL contains 640 mg of Sodium Acetate Trihydrate, USP (C 2 H 3 NaO 2 •3H 2 O); 496 mg of Sodium Chloride, USP (NaCl); 89.6 mg of Sodium Lactate (C 3 H 5 NaO 3 ); 74.6 mg of Potassium Chloride, USP (KCl); 36.8 mg of Calcium Chloride, USP (CaCl 2 •2H 2 O); and 30.5 mg of Magnesium Chloride, USP (MgCl 2 •6H 2 O).

It contains no antimicrobial agents.

The pH is adjusted with hydrochloric acid.

The pH is 5.5 (4.0 to 8.0).

PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) administered intravenously has value as a source of water, electrolytes, and calories.

One liter has an ionic concentration of 140 mEq sodium, 10 mEq potassium, 5 mEq calcium, 3 mEq magnesium, 103 mEq chloride, 47 mEq acetate, and 8 mEq lactate.

The osmolarity is 312 mOsmol/L (calc).

Normal physiologic osmolarity range is approximately 280 to 310 mOsmol/L.

Administration of substantially hypertonic solutions may cause vein damage.

The caloric content is 11 kcal/L.

The VIAFLEX plastic container is fabricated from a specially formulated polyvinyl chloride (PL 146 Plastic).

The amount of water that can permeate from inside the container into the overwrap is insufficient to affect the solution significantly.

Solutions in contact with the plastic container can leach out certain of its chemical components in very small amounts within the expiration period, e.g., di-2-ethylhexyl phthalate (DEHP), up to 5 parts per million.

However, the safety of the plastic has been confirmed in tests in animals according to USP biological tests for plastic containers as well as by tissue culture toxicity studies.

HOW SUPPLIED

PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) in VIAFLEX plastic containers is available as shown below: Code Size (mL) NDC 2B2504 1000 NDC 0338-0177-04 Exposure of pharmaceutical products to heat should be minimized.

Avoid excessive heat.

It is recommended the product be stored at room temperature (25°C); brief exposure up to 40°C does not adversely affect the product.

GERIATRIC USE

Geriatric Use Clinical studies of PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects.

Other reported clinical experience has not identified differences in responses between the elderly and younger patients.

In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or drug therapy.

Do not administer unless solution is clear and seal is intact.

INDICATIONS AND USAGE

PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) is indicated as a source of water and electrolytes or as an alkalinizing agent.

PEDIATRIC USE

Pediatric Use Safety and effectiveness of PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) in pediatric patients have not been established by adequate and well controlled trials, however, the use of electrolyte solutions in the pediatric population is referenced in the medical literature.

The warnings, precautions and adverse reactions identified in the label copy should be observed in the pediatric population.

PREGNANCY

Pregnancy Teratogenic Effects Pregnancy Category C Animal reproduction studies have not been conducted with PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP).

It is also not known whether PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity.

PLASMA-LYTE R Injection (Multiple Electrolytes Injection, Type 2, USP) should be given to a pregnant woman only if clearly needed.

DOSAGE AND ADMINISTRATION

As directed by a physician.

Dosage is dependent upon the age, weight and clinical condition of the patient as well as laboratory determinations.

Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration whenever solution and container permit.

All injections in VIAFLEX plastic containers are intended for intravenous administration using sterile equipment.

Additives may be incompatible.

Complete information is not available.

Those additives known to be incompatible should not be used.

Consult with pharmacist, if available.

If, in the informed judgment of the physician, it is deemed advisable to introduce additives, use aseptic technique.

Mix thoroughly when additives have been introduced.

Do not store solutions containing additives.

RHINOCORT 32 MCG/ACTUAT Metered Dose Nasal Spray

WARNINGS

Warnings Do not use in children under 6 years of age if you have ever had an allergic reaction to any of the ingredients Ask a doctor before use if you have had recent nose ulcers or nose surgery have had a nose injury that has not healed are using a steroid medicine for asthma, allergies or skin rash have an eye infection have or had glaucoma or cataracts When using this product the growth rate of some children may be slower some symptoms may get better on the first day of treatment.

It may take up to two weeks of daily use to feel the most symptom relief.

do not share this bottle with anyone else as this may spread germs remember to tell your doctor about all medicines you take, including this one Stop use and ask a doctor if you have, or come into contact with someone who has chickenpox, measles or tuberculosis you have or develop symptoms of an infection such as persistent fever you have any change in vision you have severe or frequent nosebleeds If pregnant or breast-feeding, ask a health professional before use.

Keep out of reach of children.

In case of overdose, get medical help or contact a Poison Control Center right away.

(1-800-222-1222)

INDICATIONS AND USAGE

Uses temporarily relieves these symptoms of hay fever or other upper respiratory allergies: nasal congestion runny nose sneezing itchy nose

INACTIVE INGREDIENTS

Inactive ingredients carboxylmethyl cellulose sodium, dextrose anhydrous, disodium edetate, hydrochloric acid (for pH adjustment), microcrystalline cellulose, polysorbate 80, potassium sorbate, purified water

PURPOSE

Purpose Nasal allergy symptom reliever

KEEP OUT OF REACH OF CHILDREN

Keep out of reach of children.

In case of overdose, get medical help or contact a Poison Control Center right away.

(1-800-222-1222)

ASK DOCTOR

Ask a doctor before use if you have had recent nose ulcers or nose surgery have had a nose injury that has not healed are using a steroid medicine for asthma, allergies or skin rash have an eye infection have or had glaucoma or cataracts

DOSAGE AND ADMINISTRATION

Directions Read instructions (inside package) on how to: get a new bottle ready (primed) before first use prime bottle again if not used for two days use the spray clean the spray nozzle ADULTS AND CHILDREN 12 YEARS OF AGE AND OLDER adults and children 12 years of age and older once daily, spray 2 times into each nostril while sniffing gently once your allergy symptoms improve, reduce to 1 spray in each nostril per day CHILDREN 6 TO UNDER 12 YEARS OF AGE the growth rate of some children may be slower while using this product.

Talk to your child’s doctor if your child needs to use the spray for longer than two months a year.

children 6 to under 12 years of age an adult should supervise use once daily, spray 1 time into each nostril while sniffing gently if allergy symptoms do not improve, increase to 2 sprays in each nostril per day.

Once allergy symptoms improve, reduce to 1 spray in each nostril per day.

children under 6 years of age do not use do not use more than directed if you forget a dose, do not double the next dose do not spray into eyes or mouth if allergy symptoms do not improve after two weeks, stop using and talk to a doctor do not use for the common cold shake well before each use

PREGNANCY AND BREAST FEEDING

If pregnant or breast-feeding, ask a health professional before use.

DO NOT USE

Do not use in children under 6 years of age if you have ever had an allergic reaction to any of the ingredients

STOP USE

Stop use and ask a doctor if you have, or come into contact with someone who has chickenpox, measles or tuberculosis you have or develop symptoms of an infection such as persistent fever you have any change in vision you have severe or frequent nosebleeds

ACTIVE INGREDIENTS

Active ingredient (in each spray) Budesonide (glucocorticoid) 32 mcg

Estradiol 0.5 MG / norethindrone acetate 0.1 MG Oral Tablet

DRUG INTERACTIONS

7 Coadministration of estradiol with norethindrone acetate did not elicit any apparent influence on the pharmacokinetics of norethindrone acetate.

Similarly, no relevant interaction of norethindrone acetate on the pharmacokinetics of estradiol was found within the NETA dose range investigated in a single dose study.

Inducers and/or inhibitors of CYP3A4 may affect estrogen drug metabolism ( 7.1 ) 7.1 Metabolic Interactions Estradiol In-vitro and in-vivo studies have shown that estrogens are metabolized partially by cytochrome P450 3A4 (CYP3A4).

Therefore, inducers or inhibitors of CYP3A4 may affect estrogen drug metabolism.

Inducers of CYP3A4 such as St.

John’s wort ( Hypericumperforatum ) preparations, phenobarbital, carbamazepine, and rifampin may reduce plasma concentrations of estrogens, possibly resulting in a decrease in therapeutic effects and/or changes in the uterine bleeding profile.

Inhibitors of CYP3A4 such as erythromycin, clarithromycin, ketoconazole, itraconazole, ritonavir and grapefruit juice may increase plasma concentrations of estrogens and result in side effects.

Norethindrone Acetate Drugs or herbal products that induce or inhibit cytochrome P-450 enzymes, including CYP3A4, may decrease or increase the serum concentrations of norethindrone.

OVERDOSAGE

10 Overdosage of estrogen plus progestin may cause nausea, vomiting, breast tenderness, abdominal pain, drowsiness and fatigue, and withdrawal bleeding may occur in women.

Treatment of overdose consists of discontinuation of Activella therapy with institution of appropriate symptomatic care.

DESCRIPTION

11 Activella 1 mg/0.5 mg is a single tablet for oral administration containing 1 mg of estradiol and 0.5 mg of norethindrone acetate and the following excipients: lactose monohydrate, starch (corn), copovidone, talc, magnesium stearate, hypromellose and triacetin.

Activella 0.5 mg/0.1 mg is a single tablet for oral administration containing 0.5 mg of estradiol and 0.1 mg of norethindrone acetate and the following excipients: lactose monohydrate, starch (corn), hydroxypropylcellulose, talc, magnesium stearate, hypromellose and triacetin.

Estradiol (E 2 ), an estrogen, is a white or almost white crystalline powder.

Its chemical name is estra-1, 3, 5 (10)-triene-3, 17β-diol hemihydrate with the empirical formula of C 18 H 24 O 2, ½ H 2 O and a molecular weight of 281.4.

The structural formula of E 2 is as follows: Estradiol Norethindrone acetate (NETA), a progestin, is a white or yellowish-white crystalline powder.

Its chemical name is 17β -acetoxy-19-nor-17α -pregn-4-en-20-yn-3-one with the empirical formula of C 22 H 28 O 3 and molecular weight of 340.5.

The structural formula of NETA is as follows: Norethindrone Acetate Estradiol Norethindrone Acetate

CLINICAL STUDIES

14 14.1 Effects on Vasomotor Symptoms In a 12-week randomized clinical trial involving 92 subjects, Activella 1 mg/0.5 mg was compared to 1 mg of estradiol and to placebo.

The mean number and intensity of hot flushes were significantly reduced from baseline to week 4 and 12 in both the Activella 1 mg/0.5 mg and the 1 mg estradiol group compared to placebo (see Figure 2).

Figure 2 Mean Weekly Number of Moderate and Severe Hot Flushes in a 12-Week Study In a study conducted in Europe a total of 577 postmenopausal women were randomly assigned to either Activella 0.5 mg/0.1 mg, 0.5 mg E 2 /0.25 mg NETA, or placebo for 24 weeks of treatment.

The mean number and severity of hot flushes were significantly reduced at week 4 and week 12 in the Activella 0.5 mg/0.1 mg (see Figure 3) and 0.5 mg E 2 /0.25 mg NETA groups compared to placebo.

Figure 3 Mean Number of Moderate to Severe Hot Flushes for Weeks 0 Through 12 Figure 2 Figure 3 14.2 Effects on the Endometrium Activella 1 mg/0.5 mg reduced the incidence of estrogen-induced endometrial hyperplasia at 1 year in a randomized, controlled clinical trial.

This trial enrolled 1,176 subjects who were randomized to one of 4 arms: 1 mg estradiol unopposed (n=296), 1 mg E 2 + 0.1 mg NETA (n=294), 1 mg E 2 + 0.25 mg NETA (n=291), and Activella 1 mg/0.5 mg (n=295).

At the end of the study, endometrial biopsy results were available for 988 subjects.

The results of the 1 mg estradiol unopposed arm compared to Activella 1 mg/0.5 mg are shown in Table 4.

TABLE 4 INCIDENCE OF ENDOMETRIAL HYPERPLASIA WITH UNOPPOSED ESTRADIOL AND ACTIVELLA 1 MG/0.5 MG IN A 12-MONTH STUDY 1 mg E 2 (n=296) Activella 1 mg E 2 /0.5 mg NETA (n=295) 1 mg E 2 /0.25 mg NETA (n=291 ) 1 mg E 2 /0.1 mg NETA (n=294 ) No.

of subjects with histological evaluation at the end of the study 247 241 251 249 No.

(%) of subjects with endometrial hyperplasia at the end of the study 36 (14.6%) 1 (0.4%) 1 (0.4%) 2 (0.8%) 14.3 Effects on Uterine Bleeding or Spotting During the initial months of therapy, irregular bleeding or spotting occurred with Activella 1 mg/0.5 mg treatment.

However, bleeding tended to decrease over time, and after 12 months of treatment with Activella 1 mg/0.5 mg, about 86 percent of women were amenorrheic (see Figure 4).

Figure 4 Patients Treated with Activella 1 mg/0.5 mg with Cumulative Amenorrhea over Time Percentage of Women with no Bleeding or Spotting at any Cycle Through Cycle 13 Intent to Treat Population, LOCF Note: the percentage of patients who were amenorrheic in a given cycle and through cycle 13 is shown.

If data were missing, the bleeding value from the last reported day was carried forward (LOCF).

In the clinical trial with Activella 0.5 mg/0.1 mg, 88 percent of women were amenorrheic after 6 months of treatment (See Figure 5).

Figure 5 Figure 4 Figure 5 14.4 Effects on Bone Mineral Density The results of two randomized, multicenter, calcium-supplemented (500-1000 mg per day), placebo-controlled, 2 year clinical trials have shown that Activella 1 mg/0.5 mg and estradiol 0.5 mg are effective in preventing bone loss in postmenopausal women.

A total of 462 postmenopausal women with intact uteri and baseline BMD values for lumbar spine within 2 standard deviations of the mean in healthy young women (T-score > -2.0) were enrolled.

In a US trial, 327 postmenopausal women (mean time from menopause 2.5 to 3.1 years) with a mean age of 53 years were randomized to 7 groups (0.25 mg, 0.5 mg, and 1 mg of estradiol alone, 1 mg estradiol with 0.25 mg norethindrone acetate, 1 mg estradiol with 0.5 mg norethindrone acetate, and 2 mg estradiol with 1 mg norethindrone acetate, and placebo.) In a European trial (EU trial), 135 postmenopausal women (mean time from menopause 8.4 to 9.3 years) with a mean age of 58 years were randomized to 1 mg estradiol with 0.25 mg norethindrone acetate, 1 mg estradiol with 0.5 mg norethindrone acetate, and placebo.

Approximately 58 percent and 67 percent of the randomized subjects in the two clinical trials, respectively, completed the two clinical trials.

BMD was measured using dual-energy x-ray absorptiometry (DXA).

A summary of the results comparing Activella 1 mg/0.5 mg and estradiol 0.5 mg to placebo from the two prevention trials is shown in Table 5.

TABLE 5 PERCENTAGE CHANGE (MEAN ± SD) IN BONE MINERAL DENSITY (BMD) FOR ACTIVELLA 1 MG/0.5 MG AND 0.5 MG E 2 While Activella 0.5 mg/0.1 mg was not directly studied in these trials, the US trial showed that addition of NETA to estradiol enhances the effect on BMD; therefore the BMD changes expected from treatment with Activella 0.5 mg/0.1 mg should be at least as great as observed with estradiol 0.5 mg.

(Intent to Treat Analysis, Last Observation Carried Forward) US Trial EU Trial Placebo (n=37) 0.5 mg E 2 (n=31) Activella 1 mg/0.5 mg (n=37) Placebo (n=40) Activella 1 mg/0.5 mg (n=38) Lumbar spine -2.1 ± 2.9 2.3 ± 2.8 Significantly (p<0.001) different from placebo 3.8 ± 3.0 -0.9 ± 4.0 5.4 ± 4.8 Femoral neck -2.3 ± 3.4 0.3 ± 2.9 Significantly (p<0.007) different from placebo 1.8 ± 4.1 -1.0 ± 4.6 0.7 ± 6.1 Femoral trochanter -2.0 ± 4.3 1.7 ± 4.1 Significantly (p<0.002) different from placebo 3.7 ± 4.3 0.8 ± 6.9 6.3 ± 7.6 US = United States, EU = European The overall difference in mean percentage change in BMD at the lumbar spine in the US trial (1000 mg per day calcium) between Activella 1 mg/0.5 mg and placebo was 5.9 percent and between estradiol 0.5 mg and placebo was 4.4 percent.

In the European trial (500 mg per day calcium), the overall difference in mean percentage change in BMD at the lumbar spine was 6.3 percent.

Activella 1 mg/0.5 mg and estradiol 0.5 mg also increased BMD at the femoral neck and femoral trochanter compared to placebo.

The increase in lumbar spine BMD in the US and European clinical trials for Activella 1 mg/0.5 mg and estradiol 0.5 mg is displayed in Figure 6.

Figure 6 Percentage Change in Bone Mineral Density (BMD) ± SEM of the Lumbar Spine (L1-L4) for Activella 1 mg/0.5 mg and Estradiol 0.5 mg (Intent to Treat Analysis with Last Observation Carried Forward) Figure 6 14.5 Women’s Health Initiative Studies The WHI enrolled approximately 27,000 predominantly healthy postmenopausal women in two substudies to assess the risks and benefits of daily oral CE (0.625 mg)-alone or in combination with MPA (2.5 mg) compared to placebo in the prevention of certain chronic diseases.

The primary endpoint was the incidence of CHD (defined as nonfatal MI, silent MI and CHD death), with invasive breast cancer as the primary adverse outcome.

A “global index” included the earliest occurrence of CHD, invasive breast cancer, stroke, PE, endometrial cancer (only in the CE plus MPA substudy), colorectal cancer, hip fracture, or death due to other cause.

These substudies did not evaluate the effects of CE plus MPA or CE-alone on menopausal symptoms.

WHI Estrogen Plus Progestin Substudy The WHI estrogen plus progestin substudy was stopped early.

According to the predefined stopping rule, after an average follow-up of 5.6 years of treatment, the increased risk of invasive breast cancer and cardiovascular events exceeded the specified benefits included in the “global index.” The absolute excess risk of events included in the “global index” was 19 per 10,000 women-years.

For those outcomes included in the WHI “global index,” that reached statistical significance after 5.6 years of follow-up, the absolute excess risks per 10,000 women-years in the group treated with CE plus MPA were 7 more CHD events, 8 more strokes, 10 more PEs, and 8 more invasive breast cancers, while the absolute risk reductions per 10,000 women-years were 6 fewer colorectal cancers and 5 fewer hip fractures.

Results of the CE plus MPA substudy, which included 16,608 women (average 63 years of age, range 50 to 79; 83.9 percent White, 6.8 percent Black, 5.4 percent Hispanic, 3.9 percent Other) are presented in Table 6.

These results reflect centrally adjudicated data after an average follow-up of 5.6 years.

Table 6: Relative and Absolute Risk Seen in the Estrogen Plus Progestin Substudy of WHI at an Average of 5.6 Years Adapted from numerous WHI publications.

WHI publications can be viewed at www.nhlbi.nih.gov/whi.

, Results are based on centrally adjudicated data.

Event Relative Risk CE/MPA versus Placebo (95% nCI Nominal confidence intervals unadjusted for multiple looks and multiple comparisons.

) CE/MPA n = 8,506 Placebo n = 8,102 Absolute Risk per 10,000 Women-Years CHD events 1.23 (0.99-1.53) 41 34 Non-fatal MI 1.28 (1.00-1.63) 31 25 CHD death 1.10 (0.70-1.75) 8 8 All strokes 1.31 (1.03–1.68) 33 25 Ischemic stroke 1.44 (1.09–1.90) 26 18 Deep vein thrombosis Not included in “global index”.

1.95 (1.43–2.67) 26 13 Pulmonary embolism 2.13 (1.45–3.11) 18 8 Invasive breast cancer Includes metastatic and non-metastatic breast cancer, with the exception of in situ breast cancer.

1.24 (1.01–1.54) 41 33 Colorectal cancer 0.61 (0.42–0.87) 10 16 Endometrial cancer 0.81 (0.48–1.36) 6 7 Cervical cancer 1.44 (0.47–4.42) 2 1 Hip fracture 0.67 (0.47–0.96) 11 16 Vertebral fractures 0.65 (0.46–0.92) 11 17 Lower arm/wrist fractures 0.71 (0.59–0.85) 44 62 Total fractures 0.76 (0.69–0.83) 152 199 Overall Mortality All deaths, except from breast or colorectal cancer, definite or probable CHD, PE or cerebrovascular disease.

1.00 (0.83-1.19) 52 52 Global Index A subset of the events was combined in a “global index” defined as the earliest occurrence of CHD events, invasive breast cancer, stroke, pulmonary embolism, colorectal cancer, hip fracture, or death due to other causes.

1.13 (1.02-1.25) 184 165 Timing of the initiation of estrogen plus progestin therapy relative to the start of menopause may affect the overall risk benefit profile.

The WHI estrogen plus progestin substudy, stratified by age, showed in women 50 to 59 years of age a non-significant trend toward reduced risk for overall mortality [hazard ratio (HR) 0.69 (95 percent CI, 0.44-1.07)].

WHI Estrogen-Alone Substudy The WHI estrogen-alone substudy was stopped early because an increased risk of stroke was observed, and it was deemed that no further information would be obtained regarding the risks and benefits of estrogen-alone in predetermined primary endpoints.

Results of the estrogen-alone substudy, which included 10,739 women (average 63 years of age, range 50 to 79; 75.3 percent White, 15.1 percent Black, 6.1 percent Hispanic, 3.6 percent Other), after an average follow-up of 7.1 years, are presented in Table 7.

Table 7: Relative and Absolute Risk Seen in the Estrogen-Alone Substudy of WHI Adapted from numerous WHI publications.

WHI publications can be viewed at www.nhlbi.nih.gov/whi.

Event Relative Risk CE versus Placebo (95% nCI Nominal confidence intervals unadjusted for multiple looks and multiple comparisons.

) CE n = 5,310 Placebo n = 5,429 Absolute Risk per 10,000 Women-Years CHD events Results are based on centrally adjudicated data for an average follow-up of 7.1 years.

0.95 (0.78–1.16) 54 57 Non-fatal MI 0.91 (0.73–1.14) 40 43 CHD death 1.01(0.71–1.43) 16 16 All strokes 1.33 (1.05-1.68) 45 33 Ischemic stroke 1.55 (1.19 – 2.01) 38 25 Deep vein thrombosis , Not included in “global index”.

1.47 (1.06–2.06) 23 15 Pulmonary embolism 1.37 (0.90–2.07) 14 10 Invasive breast cancer 0.80 (0.62–1.04) 28 34 Colorectal cancer Results are based on an average follow-up of 6.8 years.

1.08 (0.75–1.55) 17 16 Hip fracture 0.65 (0.45–0.94) 12 19 Vertebral fractures , 0.64 (0.44-0.93) 11 18 Lower arm/wrist fractures , 0.58 (0.47-0.72) 35 59 Total fractures , 0.71 (0.64-0.80) 144 197 Death due to other causes , All deaths, except from breast or colorectal cancer, definite or probable CHD, PE or cerebrovascular disease.

1.08 (0.88–1.32) 53 50 Overall mortality , 1.04 (0.88–1.22) 79 75 Global Index A subset of the events was combined in a “global index,” defined as the earliest occurrence of CHD events, invasive breast cancer, stroke, pulmonary embolism, colorectal cancer, hip fracture, or death due to other causes.

1.02 (0.92–1.13) 206 201 For those outcomes included in the WHI “global index” that reached statistical significance, the absolute excess risk per 10,000 women-years in the group treated with CE-alone was 12 more strokes, while the absolute risk reduction per 10,000 women-years was 7 fewer hip fractures.

9 The absolute excess risk of events included in the “global index” was a non-significant 5 events per 10,000 women-years.

There was no difference between the groups in terms of all-cause mortality.

No overall difference for primary CHD events (nonfatal MI, silent MI and CHD death) and invasive breast cancer incidence in women receiving CE-alone compared with placebo was reported in final centrally adjudicated results from the estrogen-alone substudy, after an average follow up of 7.1 years.

Centrally adjudicated results for stroke events from the estrogen-alone substudy, after an average follow-up of 7.1 years, reported no significant difference in distribution of stroke subtype or severity, including fatal strokes, in women receiving CE-alone compared to placebo.

Estrogen-alone increased the risk for ischemic stroke, and this excess risk was present in all subgroups of women examined.

10 Timing of the initiation of estrogen-alone therapy relative to the start of menopause may affect the overall risk benefit profile.

The WHI estrogen-alone substudy, stratified by age, showed in women 50 to 59 years of age a non-significant trend toward reduced risk for CHD [HR 0.63 (95 percent CI, 0.36-1.09)] and overall mortality [HR 0.71 (95 percent CI, 0.46-1.11)] .

14.6 Women’s Health Initiative Memory Study The WHIMS estrogen plus progestin ancillary study of WHI enrolled 4,532 predominantly healthy postmenopausal women 65 years of age and older (47 percent were 65 to 69 years of age, 35 percent were 70 to 74 years of age, 18 percent were 75 years of age and older) to evaluate the effects of daily CE (0.625 mg) plus MPA (2.5 mg) on the incidence of probable dementia (primary outcome) compared to placebo.

After an average follow-up of 4 years, the relative risk of probable dementia for CE plus MPA versus placebo was 2.05 (95 percent CI, 1.21-3.48).

The absolute risk of probable dementia for CE plus MPA versus placebo was 45 versus 22 cases per 10,000 women-years.

Probable dementia as defined in this study included Alzheimer’s disease (AD), vascular dementia (VaD) and mixed types (having features of both AD and VaD).

The most common classification of probable dementia in the treatment group and the placebo group was AD.

Since the ancillary study was conducted in women 65 to 79 years of age, it is unknown whether these findings apply to younger postmenopausal women [see Warnings and Precautions ( 5.3 ), and Use in Specific Populations ( 8.5 )].

The WHIMS estrogen-alone ancillary study of WHI study enrolled 2,947 predominantly healthy hysterectomized postmenopausal women 65 to 79 years of age (45 percent were 65 to 69 years of age, 36 percent were 70 to 74 years of age, 19 percent were 75 years of age and older) to evaluate the effects of daily CE (0.625 mg)-alone on the incidence of probable dementia (primary outcome) compared to placebo.

After an average follow-up of 5.2 years, the relative risk of probable dementia for CE-alone versus placebo was 1.49 (95 percent CI, 0.83-2.66).

The absolute risk of probable dementia for CE-alone versus placebo was 37 versus 25 cases per 10,000 women-years.

Probable dementia as defined in this study included AD, VaD and mixed types (having features of both AD and VaD).

The most common classification of probable dementia in the treatment group and the placebo group was AD.

Since the ancillary study was conducted in women 65 to 79 years of age, it is unknown whether these findings apply to younger postmenopausal women [see Warnings and Precautions ( 5.3 ), and Use in Specific Populations ( 8.5 )] .

When data from the two populations were pooled as planned in the WHIMS protocol, the reported overall relative risk for probable dementia was 1.76 (95 percent CI, 1.19-2.60).

Differences between groups became apparent in the first year of treatment.

It is unknown whether these findings apply to younger postmenopausal women [see Warnings and Precautions ( 5.3 ), and Use in Specific Populations ( 8.5 )].

HOW SUPPLIED

16 /STORAGE AND HANDLING 16.1 How Supplied Activella 1 mg/0.5 mg is a white, film-coated tablet, engraved with NOVO 288 on one side and the APIS bull on the other.

It is round, 6mm in diameter and bi-convex.

(NDC 0169-5174-02).

It is supplied as 28 tablets in a calendar dial pack dispenser.

Activella 0.5 mg/0.1 mg is a white, film-coated tablet, engraved with NOVO 291 on one side and the APIS bull on the other.

It is round, 6mm in diameter and bi-convex.

(NDC 0169-5175-10).

It is supplied as 28 tablets in a calendar dial pack dispenser.

16.2 Storage and Handling Store in a dry place protected from light.

Store at 20°C to 25°C (68°F to 77°F), excursions permitted to 15°C to 30°C (59°F to 86°F).

RECENT MAJOR CHANGES

Contraindications (4) 10/2013 Warnings and Precautions, Hereditary Angioedema (5.15) 10/2013

GERIATRIC USE

8.5 Geriatric Use There have not been sufficient numbers of geriatric women involved in clinical studies utilizing Activella to determine whether those over 65 years of age differ from younger subjects in their response to Activella.

The Women’s Health Initiative Studies In the WHI estrogen plus progestin substudy (daily CE [0.625 mg] plus MPA [2.5 mg] versus placebo), there was a higher relative risk of nonfatal stroke and invasive breast cancer in women greater than 65 years of age [see Clinical Studies ( 14.5 )].

In the WHI estrogen-alone substudy (daily CE [0.625 mg]-alone versus placebo), there was a higher relative risk of stroke in women greater than 65 years of age [see Clinical Studies ( 14.5 )].

The Women’s Health Initiative Memory Study In the WHIMS ancillary studies of postmenopausal women 65 to 79 years of age, there was an increased risk of developing probable dementia in women receiving estrogen plus progestin or estrogen-alone when compared to placebo.

It is unknown whether this finding applies to younger postmenopausal women [see Warnings and Precautions ( 5.3 ), and Clinical Studies ( 14.6 )].

Since both ancillary studies were conducted in women 65 to 79 years of age, it is unknown whether these findings apply to younger postmenopausal women 8 [see Warnings and Precautions ( 5.3 ), and Clinical Studies ( 14.6 )].

DOSAGE FORMS AND STRENGTHS

3 Activella tablets are available in two strengths: Each tablet of Activella 1 mg/ 0.5 mg contains 1 mg of estradiol and 0.5 mg of norethindrone acetate.

The tablets are white, round, bi-convex, film-coated tablets engraved with NOVO 288 on one side and the APIS bull on the other.

Each tablet of Activella 0.5 mg/ 0.1 mg contains 0.5 mg of estradiol and 0.1 mg of norethindrone acetate.

The tablets are white, round, bi-convex, film-coated tablets engraved with NOVO 291 on one side and the APIS bull on the other.

Activella (estradiol/norethindrone acetate) 1 mg/0.5 mg tablet (3) Activella (estradiol/norethindrone acetate) 0.5 mg/0.1 mg tablet (3)

MECHANISM OF ACTION

12.1 Mechanism of Action Endogenous estrogens are largely responsible for the development and maintenance of the female reproductive system and secondary sexual characteristics.

Although circulating estrogens exist in a dynamic equilibrium of metabolic interconversions, estradiol is the principal intracellular human estrogen and is substantially more potent than its metabolites, estrone and estriol, at the receptor level.

The primary source of estrogen in normally cycling adult women is the ovarian follicle, which secretes 70 to 500 mcg of estradiol daily, depending on the phase of the menstrual cycle.

After menopause, most endogenous estrogen is produced by conversion of androstenedione, secreted by the adrenal cortex, to estrone in the peripheral tissues.

Thus, estrone and the sulfate-conjugated form, estrone sulfate, are the most abundant circulating estrogens in postmenopausal women.

Estrogens act through binding to nuclear receptors in estrogen-responsive tissues.

To date, two estrogen receptors have been identified.

These vary in proportion from tissue to tissue.

Circulating estrogens modulate the pituitary secretion of the gonadotropins, luteinizing hormone (LH), and FSH through a negative feedback mechanism.

Estrogens act to reduce the elevated levels of these hormones seen in postmenopausal women.

Progestin compounds enhance cellular differentiation and generally oppose the actions of estrogens by decreasing estrogen receptor levels, increasing local metabolism of estrogens to less active metabolites, or inducing gene products that blunt cellular responses to estrogen.

Progestins exert their effects in target cells by binding to specific progesterone receptors that interact with progesterone response elements in target genes.

Progesterone receptors have been identified in the female reproductive tract, breast, pituitary, hypothalamus, and central nervous system.

INDICATIONS AND USAGE

1 Activella is an estrogen and progestin combination indicated in a woman with a uterus for: Activella 1 mg/0.5 mg and 0.5 mg/0.1 mg are indicated in a woman with a uterus for: Treatment of Moderate to Severe Vasomotor Symptoms due to Menopause ( 1.1 ) Prevention of Postmenopausal Osteoporosis ( 1.3 ) Activella 1 mg/0.5 mg is also indicated in a woman with a uterus for: Treatment of Moderate to Severe Symptoms of Vulvar and Vaginal Atrophy due to Menopause ( 1.2 ) 1.1 Treatment of Moderate to Severe Vasomotor Symptoms due to Menopause 1.2 Treatment of Moderate to Severe Symptoms of Vulvar and Vaginal Atrophy due to Menopause Limitation of Use When prescribing solely for the treatment of moderate to severe symptoms of vulvar and vaginal atrophy due to menopause, topical vaginal products should be considered.

1.3 Prevention of Postmenopausal Osteoporosis Limitation of Use When prescribing solely for the prevention of postmenopausal osteoporosis, therapy should only be considered for women at significant risk of osteoporosis and non-estrogen medication should be carefully considered.

PEDIATRIC USE

8.4 Pediatric Use Activella is not indicated in children.

Clinical studies have not been conducted in the pediatric population.

PREGNANCY

8.1 Pregnancy Activella should not be used during pregnancy [see Contraindications (4) ].

There appears to be little or no increased risk of birth defects in children born to women who have used estrogens and progestins as an oral contraceptive inadvertently during early pregnancy.

NUSRING MOTHERS

8.3 Nursing Mothers Activella should not be used during lactation.

Estrogen administration to nursing women has been shown to decrease the quantity and quality of the breast milk.

Detectable amounts of estrogen and progestin have been identified in the breast milk of women receiving estrogen plus progestin therapy.

Caution should be exercised when Activella is administered to a nursing woman.

BOXED WARNING

WARNING: CARDIOVASCULAR DISORDERS, BREAST CANCER, ENDOMETRIAL CANCER AND PROBABLE DEMENTIA Estrogen Plus Progestin Therapy Cardiovascular Disorders and Probable Dementia Estrogen plus progestin therapy should not be used for the prevention of cardiovascular disease or dementia [see Warnings and Precautions ( 5.1 , 5.3 ), and Clinical Studies ( 14.5 , 14.6 )].

The Women’s Health Initiative (WHI) estrogen plus progestin substudy reported increased risks of deep vein thrombosis (DVT), pulmonary embolism (PE), stroke and myocardial infarction (MI) in postmenopausal women (50 to 79 years of age) during 5.6 years of treatment with daily oral conjugated estrogen (CE) [0.625 mg] combined with medroxyprogesterone acetate (MPA) [2.5 mg], relative to placebo [see Warnings and Precautions ( 5.1 ), and Clinical Studies ( 14.5 )] .

The WHI Memory Study (WHIMS) estrogen plus progestin ancillary study of the WHI reported an increased risk of developing probable dementia in postmenopausal women 65 years of age or older during 4 years of treatment with daily CE (0.625 mg) combined with MPA (2.5 mg), relative to placebo.

It is unknown whether this finding applies to younger postmenopausal women [see Warnings and Precautions ( 5.3 ), Use in Specific Populations ( 8.5 ), and Clinical Studies ( 14.6 )].

Breast Cancer The WHI estrogen plus progestin substudy also demonstrated an increased risk of invasive breast cancer [see Warnings and Precautions ( 5.2 ), and Clinical Studies ( 14.5 )] .

In the absence of comparable data, these risks should be assumed to be similar for other doses of CE and MPA and other combinations and dosage forms of estrogens and progestins.

Estrogens with or without progestins should be prescribed at the lowest effective doses and for the shortest duration consistent with treatment goals and risks for the individual woman.

Estrogen-Alone Therapy Endometrial Cancer There is an increased risk of endometrial cancer in a woman with a uterus who uses unopposed estrogens.

Adding a progestin to estrogen therapy has been shown to reduce the risk of endometrial hyperplasia, which may be a precursor to endometrial cancer.

Adequate diagnostic measures, including directed or random endometrial sampling when indicated, should be undertaken to rule out malignancy in postmenopausal women with undiagnosed persistent or recurring abnormal genital bleeding [see Warnings and Precautions ( 5.2 )] .

Cardiovascular Disorders and Probable Dementia Estrogen-alone therapy should not be used for the prevention of cardiovascular disease or dementia [see Warnings and Precautions ( 5.1 , 5.3 ), and Clinical Studies ( 14.5 , 14.6 )] .

The WHI estrogen-alone substudy reported increased risks of stroke and DVT in postmenopausal women (50 to 79 years of age) during 7.1 years of treatment with daily oral CE (0.625 mg)-alone, relative to placebo [see Warnings and Precautions ( 5.1 ), and Clinical Studies ( 14.5 )] .

The WHIMS estrogen-alone ancillary study of the WHI reported an increased risk of developing probable dementia in postmenopausal women 65 years of age or older during 5.2 years of treatment with daily CE (0.625 mg)-alone, relative to placebo.

It is unknown whether this finding applies to younger postmenopausal women [see Warnings and Precautions ( 5.3 ), Use in Specific Populations ( 8.5 ), and Clinical Studies ( 14.6 )] .

In the absence of comparable data, these risks should be assumed to be similar for other doses of CE and other dosage forms of estrogens.

Estrogens with or without progestins should be prescribed at the lowest effective doses and for the shortest duration consistent with treatment WARNING: CARDIOVASCULAR DISORDERS, BREAST CANCER, ENDOMETRIAL CANCER AND PROBABLE DEMENTIA See full prescribing information for complete boxed warning Estrogen Plus Progestin Therapy Estrogen plus progestin therapy should not be used for the prevention of cardiovascular disease or dementia ( 5.1 , 5.3 ) The Women’s Health Initiative (WHI) estrogen plus progestin substudy reported increased risks of deep vein thrombosis (DVT), pulmonary embolism (PE), stroke and myocardial infarction (MI) ( 5.1 ) The WHI estrogen plus progestin substudy reported increased risks of invasive breast cancer ( 5.2 ) The WHI Memory Study (WHIMS) estrogen plus progestin ancillary study of WHI reported an increased risk of probable dementia in postmenopausal women 65 years of age and older ( 5.3 ) Estrogen-Alone Therapy There is an increased risk of endometrial cancer in a woman with a uterus who use unopposed estrogens ( 5.2 ) Estrogen-alone therapy should not be used for the prevention of cardiovascular disease or dementia ( 5.2 , 5.3 ) The WHI estrogen-alone substudy reported increased risks of stroke and DVT ( 5.1 ) The WHIMS estrogen-alone ancillary study of WHI reported an increased risk of probable dementia in postmenopausal women 65 years of age and older ( 5.3 )

WARNING AND CAUTIONS

5 WARNINGS AND PRECAUTIONS Estrogens increase the risk of gall bladder disease ( 5.4 ) Discontinue estrogen if severe hypercalcemia, loss of vision, severe hypertriglyceridemia or cholestatic jaundice occurs ( 5.5 , 5.6 , 5.9 , 5.10 ) Monitor thyroid function in women on thyroid replacement therapy ( 5.11 , 5.18 ) 5.1 Cardiovascular Disorders An increased risk of PE, DVT, stroke and MI has been reported with estrogen plus progestin therapy.

An increased risk of stroke and DVT has been reported with estrogen-alone therapy.

Should any of these occur or be suspected, estrogen with or without progestin therapy should be discontinued immediately.

Risk factors for arterial vascular disease (for example, hypertension, diabetes mellitus, tobacco use, hypercholesterolemia, and obesity) and/or venous thromboembolism (VTE) (for example, personal history or family history of VTE, obesity, and systemic lupus erythematosus) should be managed appropriately.

Stroke In the WHI estrogen plus progestin substudy, a statistically significant increased risk of stroke was reported in women 50 to 79 years of age receiving daily CE (0.625 mg) plus MPA (2.5 mg) compared to women in the same age group receiving placebo (33 versus 25 per 10,000 women-years) [see Clinical Studies (14.5) ].

The increase in risk was demonstrated after the first year and persisted.

1 Should a stroke occur or be suspected, estrogen plus progestin therapy should be discontinued immediately.

In the WHI estrogen-alone substudy, a statistically significant increased risk of stroke was reported in women 50 to 79 years of age receiving daily CE (0.625 mg)-alone compared to women in the same age group receiving placebo (45 versus 33 per 10,000 women-years).

The increase in risk was demonstrated in year 1 and persisted [see Clinical Studies ( 14.5 )].

Should a stroke occur or be suspected, estrogen-alone therapy should be discontinued immediately.

Subgroup analyses of women 50 to 59 years of age suggest no increased risk of stroke for those women receiving CE (0.625 mg)-alone versus those receiving placebo (18 versus 21 per 10,000 women-years).

1 Coronary Heart Disease In the WHI estrogen plus progestin substudy, there was a statistically non-significant increase risk of coronary heart disease (CHD) events (defined as nonfatal MI, silent MI, or CHD death) reported in women receiving daily CE (0.625 mg) plus MPA (2.5 mg) compared to women receiving placebo (41 versus 34 per 10,000 women-years).

1 An increase in relative risk was demonstrated in year 1, and a trend toward decreasing relative risk was reported in years 2 through 5 [see Clinical Studies ( 14.5 )].

In the WHI estrogen-alone substudy, no overall effect on CHD events was reported in women receiving estrogen-alone compared to placebo 2 [see Clinical Studies ( 14.5 )].

Subgroup analyses of women 50 to 59 years of age suggest a statistically non-significant reduction in CHD events (CE [0.625 mg]-alone compared to placebo) in women with less than 10 years since menopause (8 versus 16 per 10,000 women-years).

1 In postmenopausal women with documented heart disease (n=2,763), average 66.7 years of age, in a controlled clinical trial of secondary prevention of cardiovascular disease (Heart and Estrogen/Progestin Replacement Study [HERS]), treatment with daily CE (0.625 mg plus MPA (2.5 mg) demonstrated no cardiovascular benefit.

During an average follow-up of 4.1 years, treatment with CE plus MPA did not reduce the overall rate of CHD events in postmenopausal women with established CHD.

There were more CHD events in the CE plus MPA-treated group than in the placebo group in year 1, but not during the subsequent years.

Two thousand, three hundred and twenty‑one (2,321) women from the original HERS trial agreed to participate in an open label extension of HERS, HERS II.

Average follow-up in HERS II was an additional 2.7 years, for a total of 6.8 years overall.

Rates of CHD events were comparable among women in the CE plus MPA group and the placebo group in HERS, HERS II, and overall.

Venous Thromboembolism In the WHI estrogen plus progestin substudy, a statistically significant 2-fold greater rate of VTE (DVT and PE), was reported in women receiving daily CE (0.625 mg) plus MPA (2.5 mg) compared to women receiving placebo (35 versus 17 per 10,000 women-years).

Statistically significant increases in risk for both DVT (26 versus 13 per 10,000 women-years) and PE (18 versus 8 per 10,000 women-years) were also demonstrated.

The increase in VTE risk was demonstrated during the first year and persisted 3 [see Clinical Studies ( 14.5 )].

Should a VTE occur or be suspected, estrogen plus progestin therapy should be discontinued immediately.

In the WHI estrogen-alone substudy, the risk of VTE was increased for women receiving daily CE (0.625 mg)-alone compared to placebo (30 versus 22 per 10,000 women-years), although only the increased risk of DVT reached statistical significance (23 versus 15 per 10,000 women-years).

The increase in VTE risk was demonstrated during the first 2 years 4 [see Clinical Studies ( 14.5 )].

Should a VTE occur or be suspected, estrogen-alone therapy should be discontinued immediately.

If feasible, estrogens should be discontinued at least 4 to 6 weeks before surgery of the type associated with an increased risk of thromboembolism, or during periods of prolonged immobilization.

5.2 Malignant Neoplasms Breast Cancer The most important randomized clinical trial providing information about breast cancer in estrogen plus progestin users is the WHI substudy of daily CE (0.625 mg) plus MPA (2.5 mg).

After a mean follow-up of 5.6 years, the estrogen plus progestin substudy reported an increased risk of invasive breast cancer in women who took daily CE plus MPA.

In this substudy, prior use of estrogen-alone or estrogen plus progestin therapy was reported by 26 percent of the women.

The relative risk of invasive breast cancer was 1.24, and the absolute risk was 41 versus 33 cases per 10,000 women-years, for CE plus MPA compared with placebo [see Clinical Studies ( 14.5 )].

Among women who reported prior use of hormone therapy, the relative risk of invasive breast cancer was 1.86, and the absolute risk was 46 versus 25 cases per 10,000 women-years, for CE plus MPA compared with placebo.

Among women who reported no prior use of hormone therapy, the relative risk of invasive breast cancer was 1.09, and the absolute risk was 40 versus 36 cases per 10,000 women-years, for CE plus MPA compared with placebo.

In the same substudy, invasive breast cancers were larger, were more likely to be node positive, and were diagnosed at a more advanced stage in the CE (0.625 mg) plus MPA (2.5 mg) group compared with the placebo group.

Metastatic disease was rare, with no apparent difference between the two groups.

Other prognostic factors, such as histologic subtype, grade and hormone receptor status did not differ between the groups 5 [see Clinical Studies ( 14.5 )].

The most important randomized clinical trial providing information about breast cancer in estrogen-alone users is the WHI substudy of daily CE (0.625 mg)-alone.

In the WHI estrogen-alone substudy, after an average follow‑up of 7.1 years, daily CE-alone was not associated with an increased risk of invasive breast cancer [relative risk (RR) 0.80 6 [see Clinical Studies ( 14.5 )].

Consistent with the WHI clinical trials, observational studies have also reported an increased risk of breast cancer for estrogen plus progestin therapy, and a smaller increased risk for estrogen-alone therapy, after several years of use.

The risk increased with duration of use, and appeared to return to baseline over about 5 years after stopping treatment (only the observational studies have substantial data on risk after stopping).

Observational studies also suggest that the risk of breast cancer was greater, and became apparent earlier, with estrogen plus progestin therapy as compared to estrogen-alone therapy.

However, these studies have not found significant variation in the risk of breast cancer among different estrogen plus progestin combinations, doses, or routes of administration.

The use of estrogen-alone and estrogen plus progestin has been reported to result in an increase in abnormal mammograms requiring further evaluation.

In a one-year trial among 1,176 women who received either unopposed 1 mg estradiol or a combination of 1 mg estradiol plus one of three different doses of NETA (0.1, 0.25, 0.5 mg), seven new cases of breast cancer were diagnosed, two of which occurred among the group of 295 women treated with Activella 1.0 mg/0.5 mg and two of which occurred among the group of 294 women treated with 1 mg estradiol/0.1 mg NETA.

All women should receive yearly breast examinations by a healthcare provider and perform monthly breast self-examinations.

In addition, mammography examinations should be scheduled based on patient age, risk factors, and prior mammogram results.

Endometrial Cancer Endometrial hyperplasia (a possible precursor of endometrial cancer) has been reported to occur at a rate of approximately 1 percent or less with Activella.

An increased risk of endometrial cancer has been reported with the use of unopposed estrogen therapy in a woman with a uterus.

The reported endometrial cancer risk among unopposed estrogen users is about 2 to 12 times greater than in nonusers, and appears dependent on duration of treatment and on estrogen dose.

Most studies show no significant increased risk associated with use of estrogens for less than 1 year.

The greatest risk appears to be associated with prolonged use, with increased risks of 15- to 24‑fold for 5 to 10 years or more.

This risk has been shown to persist for at least 8 to 15 years after estrogen therapy is discontinued.

Clinical surveillance of all women using estrogen-alone or estrogen plus progestin therapy is important.

Adequate diagnostic measures, including directed or random endometrial sampling when indicated, should be undertaken to rule out malignancy in postmenopausal women with undiagnosed persistent or recurring abnormal genital bleeding.

There is no evidence that the use of natural estrogens results in a different endometrial risk profile than synthetic estrogens of equivalent estrogen dose.

Adding a progestin to estrogen therapy in postmenopausal women has been shown to reduce the risk of endometrial hyperplasia, which may be a precursor to endometrial cancer.

Ovarian Cancer The WHI estrogen plus progestin substudy reported a statistically non-significant increased risk of ovarian cancer.

After an average follow-up of 5.6 years, the relative risk for ovarian cancer for CE plus MPA versus placebo was 1.58 (95 percent CI, 0.77-3.24].

The absolute risk for CE plus MPA versus placebo was 4 versus 3 cases per 10,000 women-years.

7 In some epidemiologic studies, the use of estrogen plus progestin and estrogen-only products, in particular for 5 or more years, has been associated with an increased risk of ovarian cancer.

However, the duration of exposure associated with increased risk is not consistent across all epidemiologic studies, and some report no association .

5.3 Probable Dementia In the WHIMS estrogen plus progestin ancillary study of WHI, a population of 4,532 postmenopausal women 65 to 79 years of age was randomized to daily CE (0.625 mg) plus MPA (2.5 mg) or placebo.

After an average follow-up of 4 years, 40 women in the CE plus MPA and 21 women in the placebo group were diagnosed with probable dementia.

The relative risk of probable dementia for the CE plus MPA versus placebo was 2.05 (95 percent CI, 1.21-3.48).

The absolute risk of probable dementia for CE plus MPA versus placebo was 45 versus 22 cases per 10,000 women-years 8 [see Use in Specific Populations ( 8.5 ), and Clinical Studies ( 14.6 )].

In the WHIMS estrogen-alone ancillary study of WHI, a population of 2,947 hysterectomized women 65 to 79 years of age was randomized to daily CE (0.625 mg)-alone or placebo.

After an average follow-up of 5.2 years, 28 women in the estrogen-alone group and 19 women in the placebo group were diagnosed with probable dementia.

The relative risk of probable dementia for CE-alone versus placebo was 1.49 (95 percent CI, 0.83-2.66).

The absolute risk of probable dementia for CE-alone versus placebo was 37 versus 25 cases per 10,000 women-years 8 [see Use in Specific Populations (8.5) , and Clinical Studies ( 14.6 )].

When data from the two populations in the WHIMS estrogen-alone and estrogen plus progestin ancillary studies were pooled as planned in the WHIMS protocol, the reported overall relative risk of probable dementia was 1.76 (95 percent CI, 1.19-2.60).

Since both ancillary studies were conducted in women 65 to 79 years of age, it is unknown whether these findings apply to younger postmenopausal women 8 [see Use in Specific Populations ( 8.5 ), and Clinical Studies ( 14.6 )].

5.4 Gallbladder Disease A 2- to 4 fold increase in the risk of gallbladder disease requiring surgery in postmenopausal women receiving estrogens has been reported.

5.5 Hypercalcemia Estrogen administration may lead to severe hypercalcemia in patients with breast cancer and bone metastases.

If hypercalcemia occurs, use of the drug should be stopped and appropriate measures taken to reduce the serum calcium level.

5.6 Vision Abnormalities Retinal vascular thrombosis has been reported in patients receiving estrogens.

Discontinue medication pending examination if there is a sudden partial or complete loss of vision, or a sudden onset of proptosis, diplopia, or migraine.

If examination reveals papilledema or retinal vascular lesions, estrogens should be permanently discontinued.

5.7 Addition of a Progestin When a Woman Has Not Had a Hysterectomy Studies of the addition of a progestin for 10 or more days of a cycle of estrogen administration, or daily with estrogen in a continuous regimen, have reported a lowered incidence of endometrial hyperplasia than would be induced by estrogen treatment alone.

Endometrial hyperplasia may be a precursor to endometrial cancer.

There are, however, possible risks that may be associated with the use of progestins with estrogens compared to estrogen-alone regimens.

These include an increased risk of breast cancer.

5.8 Elevated Blood Pressure In a small number of case reports, substantial increases in blood pressure have been attributed to idiosyncratic reactions to estrogens.

In a large, randomized, placebo-controlled clinical trial, a generalized effect of estrogen therapy on blood pressure was not seen.

5.9 Hypertriglyceridemia In women with pre-existing hypertriglyceridemia, estrogen therapy may be associated with elevations of plasma triglycerides leading to pancreatitis.

Consider discontinuation of treatment if pancreatitis occurs.

5.10 Hepatic Impairment and/or Past History of Cholestatic Jaundice Estrogens may be poorly metabolized in women with impaired liver function.

For women with a history of cholestatic jaundice associated with past estrogen use or with pregnancy, caution should be exercised, and in the case of recurrence, medication should be discontinued.

5.11 Hypothyroidism Estrogen administration leads to increased thyroid-binding globulin (TBG) levels.

Women with normal thyroid function can compensate for the increased TBG by making more thyroid hormone, thus maintaining free T 4 and T 3 serum concentrations in the normal range.

Women dependent on thyroid hormone replacement therapy who are also receiving estrogen may require increased doses of their thyroid replacement therapy.

These women should have their thyroid function monitored to maintain their free thyroid hormone levels in an acceptable range.

5.12 Fluid Retention Estrogens plus progestins may cause some degree of fluid retention.

Women with conditions that might be influenced by this factor, such as a cardiac or renal impairment, warrant careful observation when estrogens plus progestins are prescribed.

5.13 Hypocalcemia Estrogen therapy should be used with caution in women with hypoparathyroidism as estrogen-induced hypocalcemia may occur.

5.14 Exacerbation of Endometriosis A few cases of malignant transformation of residual endometrial implants have been reported in women treated post-hysterectomy with estrogen-alone therapy.

For women known to have residual endometriosis post-hysterectomy, the addition of progestin should be considered.

5.15 Hereditary Angioedema Exogenous estrogens may exacerbate symptoms of angioedema in women with hereditary angioedema.

5.16 Exacerbation of Other Conditions Estrogen therapy may cause an exacerbation of asthma, diabetes mellitus, epilepsy, migraine, porphyria, systemic lupus erythematosus, and hepatic hemangiomas and should be used with caution in women with these conditions.

5.17 Laboratory Tests Serum follicle stimulating hormone (FSH) and estradiol levels have not been shown to be useful in the management of moderate to severe vasomotor symptoms and moderate to severe symptoms of vulvar and vaginal atrophy.

5.18 Drug-Laboratory Test Interactions Accelerated prothrombin time, partial thromboplastin time, and platelet aggregation time; increased platelet count; increased factors II, VII antigen, VIII coagulant activity, IX, X, XII, VII-X complex, and beta-thromboglobulin; decreased levels of anti-factor Xa and antithrombin III, decreased antithrombin III activity, increased levels of fibrinogen and fibrinogen activity; increased plasminogen antigen and activity.

Increased TBG levels leading to increased circulating total thyroid hormone levels as measured by protein-bound iodine (PBI), T 4 levels (by column or by radioimmunoassay), or T 3 levels by radioimmunoassay.

T 3 resin uptake is decreased, reflecting the elevated TBG.

Free T 4 and free T 3 concentrations are unaltered.

Women on thyroid replacement therapy may require higher doses of thyroid hormone.

Other binding proteins may be elevated in serum, for example, corticosteroid binding globulin (CBG), sex hormone-binding globulin (SHBG), leading to increased total circulating corticosteroids and sex steroids, respectively.

Free hormone concentrations, such as testosterone and estradiol, may be decreased.

Other plasma proteins may be increased (angiotensinogen/rennin substrate, alpha-1 antitrypsin, ceruloplasmin).

Increased plasma high-density lipoprotein (HDL) and HDL 2 cholesterol subfraction concentration, reduced low-density lipoprotein (LDL) cholesterol concentration, increased triglyceride levels.

Impaired glucose tolerance.

INFORMATION FOR PATIENTS

17 PATIENT COUNSELING INFORMATION See FDA-approved patient labeling (Patient Information) 17.1 Abnormal Vaginal Bleeding Inform postmenopausal women of the importance of reporting abnormal vaginal bleeding to their healthcare provider as soon as possible [see Warnings and Precautions ( 5.2 )] .

17.2 Possible Serious Adverse Reactions with Estrogen Plus Progestin Therapy Inform postmenopausal women of possible serious adverse reactions of estrogen plus progestin therapy including Cardiovascular Disorders, Malignant Neoplasms, and Probable Dementia [see Warnings and Precautions ( 5.1 , 5.2 , 5.3 )].

17.3 Possible Less Serious but Common Adverse Reactions with Estrogen Plus Progestin Therapy Inform postmenopausal women of possible less serious but common adverse reactions of estrogen plus progestin therapy such as headache, breast pain and tenderness, nausea and vomiting.

Date of Issue: 10/2013 Rx Only Activella ® is a registered trademark owned by Novo Nordisk FemCare AG © 2000-2013 Novo Nordisk For information contact: Novo Nordisk Inc.

800 Scudders Mill Road Plainsboro, NJ 08536, USA 1-866-668-6336 www.novonordisk-us.com Manufactured by: Novo Nordisk A/S 2880 Bagsvaerd, Denmark

DOSAGE AND ADMINISTRATION

2 Use of estrogen-alone, or in combination with a progestin, should be with the lowest effective dose and for the shortest duration consistent with treatment goals and risks for the individual woman.

Postmenopausal women should be re-evaluated periodically as clinically appropriate to determine if treatment is still necessary.

One tablet to be taken once daily ( 2 ) 2.1 Treatment of Moderate to Severe Vasomotor Symptoms due to Menopause Activella therapy consists of a single tablet to be taken once daily for the treatment of moderate to severe vasomotor symptoms due to menopause.

Activella 1 mg/0.5 mg Activella 0.5 mg/0.1 mg 2.2 Treatment of Moderate to Severe Symptoms of Vulvar and Vaginal Atrophy due to Menopause Activella therapy consists of a single tablet to be taken once daily for the treatment of moderate to severe symptoms of vulvar and vaginal atrophy due to menopause.

Activella 1 mg/0.5 mg 2.3 Prevention of Postmenopausal Osteoporosis Activella therapy consists of a single tablet to be taken once daily for the prevention of postmenopausal osteoporosis.

Activella 1 mg/0.5 mg Activella 0.5 mg/0.1 mg

metformin hydrochloride 750 MG 24 HR Extended Release Oral Tablet

DRUG INTERACTIONS

Drug Interactions (Clinical Evaluation of Drug Interactions Conducted with metformin hydrochloride tablets, USP) Glyburide: In a single-dose interaction study in type 2 diabetes patients, co-administration of metformin and glyburide did not result in any changes in either metformin pharmacokinetics or pharmacodynamics.

Decreases in glyburide AUC and C max were observed, but were highly variable.

The single-dose nature of this study and the lack of correlation between glyburide blood levels and pharmacodynamic effects, makes the clinical significance of this interaction uncertain (see DOSAGE AND ADMINISTRATION: Concomitant Metformin Hydrochloride Tablets, USP or Metformin Hydrochloride Extended-release Tablets, USP and Oral Sulfonylurea Therapy ).

Furosemide: A single-dose, metformin-furosemide drug interaction study in healthy subjects demonstrated that pharmacokinetic parameters of both compounds were affected by coadministration.

Furosemide increased the metformin plasma and blood C max by 22% and blood AUC by 15%, without any significant change in metformin renal clearance.

When administered with metformin, the C max and AUC of furosemide were 31% and 12% smaller, respectively, than when administered alone, and the terminal half-life was decreased by 32%, without any significant change in furosemide renal clearance.

No information is available about the interaction of metformin and furosemide when co-administered chronically.

Nifedipine: A single-dose, metformin-nifedipine drug interaction study in normal healthy volunteers demonstrated that co-administration of nifedipine increased plasma metformin C max and AUC by 20% and 9%, respectively, and increased the amount excreted in the urine.

T max and half-life were unaffected.

Nifedipine appears to enhance the absorption of metformin.

Metformin had minimal effects on nifedipine.

Cationic drugs: Cationic drugs (e.g., amiloride, digoxin, morphine, procainamide, quinidine, quinine, ranitidine, triamterene, trimethoprim, or vancomycin) that are eliminated by renal tubular secretion theoretically have the potential for interaction with metformin by competing for common renal tubular transport systems.

Such interaction between metformin and oral cimetidine has been observed in normal healthy volunteers in both single- and multiple-dose, metformin-cimetidine drug interaction studies, with a 60% increase in peak metformin plasma and whole blood concentrations and a 40% increase in plasma and whole blood metformin AUC.

There was no change in elimination half-life in the single-dose study.

Metformin had no effect on cimetidine pharmacokinetics.

Although such interactions remain theoretical (except for cimetidine), careful patient monitoring and dose adjustment of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP and/or the interfering drug is recommended in patients who are taking cationic medications that are excreted via the proximal renal tubular secretory system.

Other: Certain drugs tend to produce hyperglycemia and may lead to loss of glycemic control.

These drugs include the thiazides and other diuretics, corticosteroids, phenothiazines, thyroid products, estrogens, oral contraceptives, phenytoin, nicotinic acid, sympathomimetics, calcium channel blocking drugs, and isoniazid.

When such drugs are administered to a patient receiving metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP, the patient should be closely observed for loss of blood glucose control.

When such drugs are withdrawn from a patient receiving metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP, the patient should be observed closely for hypoglycemia.

In healthy volunteers, the pharmacokinetics of metformin and propranolol and metformin and ibuprofen were not affected when co-administered in single-dose interaction studies.

Metformin is negligibly bound to plasma proteins and is, therefore, less likely to interact with highly protein-bound drugs such as salicylates, sulfonamides, chloramphenicol, and probenecid, as compared to the sulfonylureas, which are extensively bound to serum proteins.

OVERDOSAGE

Overdose of metformin hydrochloride has occurred, including ingestion of amounts greater than 50 grams.

Hypoglycemia was reported in approximately 10% of cases, but no causal association with metformin hydrochloride has been established.

Lactic acidosis has been reported in approximately 32% of metformin overdose cases (see WARNINGS ).

Metformin is dialyzable with a clearance of up to 170 mL/min under good hemodynamic conditions.

Therefore, hemodialysis may be useful for removal of accumulated drug from patients in whom metformin overdosage is suspected.

DESCRIPTION

Metformin hydrochloride tablets, USP and metformin hydrochloride extended-release tablets, USP are oral antihyperglycemic drugs used in the management of type 2 diabetes.

Metformin hydrochloride (N,N-dimethylimidodicarbonimidic diamide hydrochloride) is not chemically or pharmacologically related to any other classes of oral antihyperglycemic agents.

The structural formula is as shown: Metformin hydrochloride is a white to off-white crystalline compound with a molecular formula of C 4 H 11 N 5 ·HCl and a molecular weight of 165.63.

Metformin hydrochloride is freely soluble in water and is practically insoluble in acetone, ether and chloroform.

The pKa of metformin is 12.4.

The pH of a 1% aqueous solution of metformin hydrochloride is 6.68.

Metformin hydrochloride tablets, USP contain 500 mg, 850 mg, or 1000 mg of metformin hydrochloride.

Each tablet contains the inactive ingredients magnesium stearate, microcrystalline cellulose and povidone.

In addition, the coating for the 500 mg, 850 mg and 1000 mg tablets contains hypromellose 2910, polyethylene glycol 400 and titanium dioxide.

Metformin hydrochloride extended-release tablets, USP contain 500 mg or 750 mg of metformin hydrochloride as the active ingredient.

Metformin hydrochloride extended-release 500 mg tablets, USP contain the inactive ingredients hypromellose 2208, colloidal silicon dioxide, and magnesium stearate.

Metformin hydrochloride extended-release 750 mg tablets, USP contain the inactive ingredients hypromellose 2208, colloidal silicon dioxide, D&C yellow #10 aluminum lake, and magnesium stearate.

Label

CLINICAL STUDIES

METFORMIN HYDROCHLORIDE TABLETS, USP In a double-blind, placebo-controlled, multicenter U.S.

clinical trial involving obese patients with type 2 diabetes whose hyperglycemia was not adequately controlled with dietary management alone (baseline fasting plasma glucose [FPG] of approximately 240 mg/dL), treatment with metformin hydrochloride tablets, USP (up to 2550 mg/day) for 29 weeks resulted in significant mean net reductions in fasting and postprandial plasma glucose (PPG) and hemoglobin A 1c (HbA 1c ) of 59 mg/dL, 83 mg/dL, and 1.8%, respectively, compared to the placebo group (see Table 2 ).

Table 2.

Metformin Hydrochloride vs.

Placebo Summary of Mean Changes from Baseline* in Plasma Glucose HbA1c and Body Weight, at Final Visit (29-week study) * All patients on diet therapy at Baseline ** Not statistically significant Metformin Hydrochloride (n =141) Placebo (n=145) P-Value FPG (mg/dL) Baseline 241.5 237.7 NS** Change at FINAL VISIT -53.0 6.3 0.001 Hemoglobin A 1c (%) Baseline 8.4 8.2 NS** Change at FINAL VISIT -1.4 0.4 0.001 Body Weight (lbs) Baseline 201.0 206.0 NS** Change at FINAL VISIT -1.4 -2.4 NS** A 29-week, double-blind, placebo-controlled study of metformin hydrochloride tablets, USP and glyburide, alone and in combination, was conducted in obese patients with type 2 diabetes who had failed to achieve adequate glycemic control while on maximum doses of glyburide (baseline FPG of approximately 250 mg/dL) (see Table 3 ).

Patients randomized to the combination arm started therapy with metformin hydrochloride tablets, USP 500 mg and glyburide 20 mg.

At the end of each week of the first four weeks of the trial, these patients had their dosages of metformin hydrochloride tablets, USP increased by 500 mg if they had failed to reach target fasting plasma glucose.

After week four, such dosage adjustments were made monthly, although no patient was allowed to exceed metformin hydrochloride tablets, USP 2500 mg.

Patients in the metformin hydrochloride tablets, USP only arm (metformin plus placebo) followed the same titration schedule.

At the end of the trial, approximately 70% of the patients in the combination group were taking metformin hydrochloride tablets, USP 2000 mg/glyburide 20 mg or metformin hydrochloride tablets, USP 2500 mg/glyburide 20 mg.

Patients randomized to continue on glyburide experienced worsening of glycemic control, with mean increases in FPG, PPG and HbA 1c of 14 mg/dL, 3 mg/dL and 0.2%, respectively.

In contrast, those randomized to metformin hydrochloride tablets, USP (up to 2500 mg/day) experienced a slight improvement, with mean reductions in FPG, PPG and HbA 1c of 1 mg/dL, 6 mg/dL and 0.4%, respectively.

The combination of metformin hydrochloride tablets, USP and glyburide was effective in reducing FPG, PPG and HbA 1c levels by 63 mg/dL, 65 mg/dL, and 1.7%, respectively.

Compared to results of glyburide treatment alone, the net differences with combination treatment were -77 mg/dL, -68 mg/dL and -1.9%, respectively (see Table 3 ).

Table 3.

Combined Metformin/Glyburide (Comb) vs.

Glyburide (Glyb) or Metformin Hydrochloride (MET) Monotherapy: Summary of Mean Changes from Baseline* in Fasting Plasma Flucose, HbA1c and Body Weight, at Final Visit (29-week study) *All patients on glyburide, 20 mg/day, at Baseline **Not statically significant Comb (n=213) Glyb (n=209) MET (n=210) p-values Glyb vs.

Comb MET vs.

Comb MET vs.

Glyb Fasting Plasma Glucose (mg/dL) Baseline 250.5 247.5 253.9 NS** NS** NS** Change at FINAL VISIT -63.5 13.7 -0.9 0.001 0.001 0.025 Hemoglobin A 1c (%) Baseline 8.8 8.5 8.9 NS** NS** 0.007 Change at FINAL VISIT -1.7 0.2 -0.4 0.001 0.001 0.001 Body Weight (lbs.) Baseline 202.2 203.0 204.0 NS** NS** NS** Change at FINAL VISIT 0.9 -0.7 -8.4 0.011 0.001 0.001 The magnitude of the decline in fasting blood glucose concentration following the institution of metformin hydrochloride tablets, USP therapy was proportional to the level of fasting hyperglycemia.

Patients with type 2 diabetes with higher fasting glucose concentrations experienced greater declines in plasma glucose and glycosylated hemoglobin.

In clinical studies, metformin hydrochloride tablets, USP, alone or in combination with a sulfonylurea, lowered mean fasting serum triglycerides, total cholesterol and LDL cholesterol levels and had no adverse effects on other lipid levels (see Table 4 ).

Table 4.

Summary of Mean Percent Change from Baseline of Major Serum Lipid Variables at Final Visit (29-week studies) Metformin Hydrochloride vs.

Placebo Combined Metformin/ Glyburide vs.

Monotherapy Metformin Hydrochloride (n=141) Placebo (n=145) Metformin Hydrochloride (n=141) Metformin Hydrochloride/ Glyburide (n=213) Glyburide (n=209) Total Cholesterol (mg/dL) Baseline 211.0 212.3 213.1 215.6 219.6 Mean % change at FINAL VISIT -5% 1% -2% -4% 1% Total Triglycerides (mg/dL) Baseline 236.1 203.5 242.5 215.0 266.1 Mean % change at FINAL VISIT -16% 1% -3% -8% 4% LDL-Cholesterol (mg/dL) Baseline 135.4 138.5 134.3 136.0 137.5 Mean % change at FINAL VISIT -8% 1% -4% -6% 3% HDL-Cholesterol (mg/dL) Baseline 39.0 40.5 37.2 39.0 37.0 Mean % change at FINAL VISIT 2% -1% 5% 3% 1% In contrast to sulfonylureas, body weight of individuals on metformin hydrochloride tablets, USP tended to remain stable or even decrease somewhat (see Tables 2 and 3 ).

A 24-week, double-blind, placebo-controlled study of metformin hydrochloride tablets, USP plus insulin versus insulin plus placebo was conducted in patients with type 2 diabetes who failed to achieve adequate glycemic control on insulin alone (see Table 5 ).

Patients randomized to received metformin hydrochloride tablets, USP plus insulin achieved a reduction in HbA 1 c of 2.10%, compared to 1.56% reduction in HbA 1c achieved by insulin plus placebo.

The improvement in glycemic control was achieved at the final study visit with 16% less insulin, 93.0 U/day vs.

110.6 U/day, metformin hydrochloride tablets, USP plus insulin versus insulin plus placebo, respectively P = 0.04.

Table 5.

Combined Metformin Hydrochloride/Insulin vs.

Placebo/Insulin Summary of Mean Changes from Baseline in HbA 1c and Daily Insulin Dose ªStatistically significant using analysis of covariance with baseline as covariate (p=0.04) Not significant using analysis of variance (values shown in table) b Statistically significant for insulin (p=0.04) Metformin Hydrochloride/Insulin (n=26) Placebo/Insulin (n=28) Treatment Difference Mean ± SE Hemoglobin A 1c (%) Baseline 8.95 9.32 Change at FINAL VISIT -2.10 -1.56 -0.54 ± 0.43ª Insulin Dose (U/day) Baseline 93.12 94.64 Change at FINAL VISIT -0.15 15.93 -16.08 ± 7.77 b A second double-blind, placebo-controlled study (n=51), with 16 weeks of randomized treatment, demonstrated that in patients with type 2 diabetes controlled on insulin for 8 weeks with an average HbA 1c of 7.46 ± 0.97%, the addition of metformin hydrochloride tablets, USP maintained similar glycemic control (HbA 1c 7.15 ± 0.61 versus 6.97 ± 0.62 for metformin hydrochloride tablets, USP plus insulin and placebo plus insulin respectively) with 19% less insulin versus baseline (reduction of 23.68 ± 30.22 versus an increase of 0.43 ± 25.20 units for metformin hydrochloride tablets, USP plus insulin and placebo plus insulin, p<0.01).

In addition, this study demonstrated that the combination of metformin hydrochloride tablets, USP plus insulin resulted in reduction in body weight of 3.11 ± 4.30 lbs, compared to an increase of 1.30 ± 6.08 lbs for placebo plus insulin, p=0.01.

METFORMIN HYDROCHLORIDE EXTENDED-RELEASE TABLETS, USP A 24-week, double-blind, placebo-controlled study of metformin hydrochloride extended-release tablets, USP, taken once daily with the evening meal, was conducted in patients with type 2 diabetes who had failed to achieve glycemic control with diet and exercise (HbA 1c 7.0-10.0%, FPG 126-270 mg/dL).

Patients entering the study had a mean baseline HbA 1c of 8.0% and a mean baseline FPG of 176 mg/dL.

After 12 weeks treatment, mean HbA 1c had increased from baseline by 0.1% and mean FPG decreased from baseline by 2 mg/dL in the placebo group, compared with a decrease in mean HbA 1c of 0.6% and a decrease in mean FPG of 23 mg/dL in patients treated with metformin hydrochloride extended-release tablets, USP 1000 mg once daily.

Subsequently, the treatment dose was increased to 1500 mg once daily if HbA 1c was ≥ 7.0 % but <8.0% (patients with HbA 1c ≥ 8.0% were discontinued from the study).

At the final visit (24-week), mean HbA 1c had increased 0.2% from baseline in placebo patients and decreased 0.6% with metformin hydrochloride extended-release tablets, USP.

A 16-week, double-blind, placebo-controlled, dose-response study of metformin hydrochloride extended-release tablets, USP, taken once daily with the evening meal, or twice daily with meals, was conducted in patients with type 2 diabetes who had failed to achieve glycemic control with diet and exercise (HbA 1c 7.0-11.0%, FPG 126-280 mg/dL).

Changes in glycemic control and body weight are shown in Table 6 .

Table 6.

Summary of Mean Changes from Baseline* in HbA 1c , Fasting Plasma Glucose, and Body Weight at Final Visit (16-week study) * All patients on diet therapy at Baseline ª All comparisons versus Placebo ** Not statistically significant Metformin hydrochloride extended-release 500 mg Once Daily 1000 mg Once Daily 1500 mg Once Daily 2000 mg Once Daily 1000 mg Twice Daily Placebo Hemoglobin A 1c (%) (n=115) (n=115) (n=111) (n=125) (n=112) (n=111) Baseline 8.2 8.4 8.3 8.4 8.4 8.4 Change at FINAL VISIT -0.4 -0.6 -0.9 -0.8 -1.1 0.1 p-valueª <0.001 <0.001 <0.001 <0.001 <0.001 – FPG (mg/dL) (n=126) (n=118) (n=120) (n=132) (n=122) (n=113) Baseline 182.7 183.7 178.9 181.0 181.6 179.6 Change at FINAL VISIT -15.2 -19.3 -28.5 -29.9 -33.6 7.6 p-valueª <0.001 <0.001 <0.001 <0.001 <0.001 – Body Weight (lbs) (n=125) (n=119) (n=117) (n=131) (n=119) (n=113) Baseline 192.9 191.8 188.3 195.4 192.5 194.3 Change at FINAL VISIT -1.3 -1.3 -0.7 -1.5 -2.2 -1.8 p-valueª NS** NS** NS** NS** NS** – Compared with placebo, improvement in glycemic control was seen at all dose levels of metformin hydrochloride extended-release tablets, USP and treatment was not associated with any significant change in weight (see DOSAGE AND ADMINISTRATION for dosing recommendations for metformin hydrochloride tablets, USP and metformin hydrochloride extended-release tablets, USP).

A 24-week, double-blind, randomized study of metformin hydrochloride extended-release tablets, USP, taken once daily with the evening meal, and metformin hydrochloride tablets, USP, taken twice daily (with breakfast and evening meal), was conducted in patients with type 2 diabetes who had been treated with metformin hydrochloride tablets, USP 500 mg twice daily for at least 8 weeks prior to study entry.

The metformin hydrochloride tablets, USP dose had not necessarily been titrated to achieve a specific level of glycemic control prior to study entry.

Patients qualified for the study if HbA 1c was ≤ 8.5 % and FPG was ≤ 200 mg/dL.

Changes in glycemic control and body weight are shown in Table 7 .

Table 7.

Summary of Mean Changes from Baseline* in HbA 1c , Fasting Plasma Glucose, and Body Weight at Week 12 and at Final Visit (24-week study) *All patients on metformin hydrochloride tablets, USP 500 mg twice daily at Baseline ª n=68 Metformin Metformin Hydrochloride Extended-release Tablets, USP Hydrochloride Tablets, USP 500 mg Twice Daily 1000 mg Once Daily 1500 mg Once Daily Hemoglobin A 1c (%) (n=67) (n=72) (n=66) Baseline 7.06 6.99 7.02 Change at 12 Weeks 0.14 0.23 0.04 (95% CI) (-0.03, 0.31) (0.10, 0.36) (-0.08, 0.15) Change at FINAL VISIT 0.14ª 0.27 0.13 (95%) (-0.04, 0.31) (0.11, 0.43) (-0.02, 0.28) FPG (mg/dL) (n=69) (n=72) (n=70) Baseline 127.2 131.0 131.4 Change at 12 Weeks 12.9 9.5 3.7 (95% CI) (6.5, 19.4) (4.4, 14.6) (-0.4, 7.8) Change at FINAL VISIT 14.0 11.5 7.6 (95%) (7.0, 21.0) (4.4, 18.6) (1.0, 14.2) Body Weight (lbs) (n=71) (n=74) (n=71) Baseline 210.3 202.8 192.7 Change at 12 Weeks 0.4 0.9 0.7 (95% CI) (-0.04, 1.5) (0.0, 2.0) (-0.04, 1.8) Change at FINAL VISIT 0.9 1.1 0.9 (95%) (-0.04, 2.2) (-0.2, 2.4) (-0.4, 2.0) After 12 weeks of treatment, there was an increase in mean HbA 1c in all groups; in the metformin hydrochloride extended-release tablets, USP 1000 mg group, the increase from baseline of 0.23% was statistically significant (see DOSAGE AND ADMINISTRATION ).

Changes in lipid parameters in the previously described placebo-controlled dose-response study of metformin hydrochloride extended-release tablets, USP are shown in Table 8 .

Table 8.

Summary of Mean Percent Changes from Baseline* in Major Lipid Variables at Final Visit (16-week study) *All patients on diet therapy at Baseline Metformin Hydrochloride Extended-release Tablets, USP 500 mg Once Daily 1000 mg Once Daily 1500 mg Once Daily 2000 mg Once Daily 1000 mg Twice Daily Placebo Total Cholesterol (mg/dL) (n=120) (n=113) (n=110) (n=126) (n=117) (n=110) Baseline 210.3 218.1 214.6 204.4 208.2 208.6 Mean % change at FINAL VISIT 1.0% 1.7% 0.7% -1.6% -2.6% 2.6% Total Triglycerides (mg/dL) (n=120) (n=113) (n=110) (n=126) (n=117) (n=110) Baseline 220.2 211.9 198.0 194.2 179.0 211.7 Mean % change at FINAL VISIT 14.5% 9.4% 15.1% 14.9% 9.4% 10.9% LDL-Cholesterol (mg/dL) (n=119) (n=113) (n=109) (n=126) (n=117) (n=107) Baseline 131.0 134.9 135.8 125.8 131.4 131.9 Mean % change at FINAL VISIT -1.4% -1.6% -3.5% -3.3% -5.5% 3.2% HDL-Cholesterol (mg/dL) (n=120) (n=108) (n=108) (n=125) (n=117) (n=108) Baseline 40.8 41.6 40.6 40.2 42.4 39.4 Mean % change at FINAL VISIT 6.2% 8.6% 5.5% 6.1% 7.1% 5.8% Changes in lipid parameters in the previously described study of metformin hydrochloride tablets, USP and metformin hydrochloride extended-release tablets, USP are shown in Table 9 .

Table 9.

Summary of Mean Percent Changes from Baseline* in Major Lipid Variables at Final Visit (24-week study) *All patients on metformin hydrochloride tablets, USP 500 mg twice daily at Baseline Metformin Hydrochloride Tablets, USP Metformin Hydrochloride Extended-release Tablets, USP 500 mg Twice Daily 1000 mg Once Daily 1500 mg Once Daily Total Cholesterol (mg/dL) (n=68) (n=70) (n=66) Baseline 199.0 201.9 201.6 Mean % change at FINAL VISIT 0.1% 1.3% 0.1% Total Triglycerides (mg/dL) (n=68) (n=70) (n=66) Baseline 178.0 169.2 206.8 Mean % change at FINAL VISIT 6.3% 25.3% 33.4% LDL-Cholesterol (mg/dL) (n=68) (n=70) (n=66) Baseline 122.1 126.2 115.7 Mean % change at FINAL VISIT -1.3% -3.3% -3.7% HDL-Cholesterol (mg/dL) (n=68) (n=70) (n=65) Baseline 41.9 41.7 44.6 Mean % change at FINAL VISIT 4.8% 1.0% -2.1% Pediatric Clinical Studies In a double-blind, placebo-controlled study in pediatric patients aged 10 to 16 years with type 2 diabetes (mean FPG 182.2 mg/dL), treatment with metformin hydrochloride tablets, USP (up to 2000 mg/day) for up to 16 weeks (mean duration of treatment 11 weeks) resulted in a significant mean net reduction in FPG of 64.3 mg/dL, compared with placebo (see Table 10 ).

Table 10.

Metformin Hydrochloride Tablets, USP vs.

Placebo (Pediatricsª) Summary of Mean Changes from Baseline* in Plasma Glucose and Body Weight at Final Visit ª Pediatric patients mean age 13.8 years (range 10-16 years) * All patients on diet therapy at Baseline ** Not statistically significant Metformin Hydrochloride Tablets, USP Placebo p-Value FPG (mg/dL) (n=37) (n=36) Baseline 162.4 192.3 Change at FINAL VISIT -42.9 21.4 <0.001 Body Weight (lbs) (n=39) (n=38) Baseline 205.3 189.0 Change at FINAL VISIT -3.3 -2.0 NS**

HOW SUPPLIED

Metformin hydrochloride tablets, USP are available as: 500 mg Bottles of 100 NDC 62037-674-01 500 mg Bottles of 500 NDC 62037-674-05 500 mg Bottles of 1000 NDC 62037-674-10 850 mg Bottles of 100 NDC 62037-675-01 850 mg Bottles of 500 NDC 62037-675-05 850 mg Bottles of 1000 NDC 62037-675-10 1000 mg Bottles of 100 NDC 62037-676-01 1000 mg Bottles of 500 NDC 62037-676-05 1000 mg Bottles of 1000 NDC 62037-676-10 Metformin hydrochloride 500 mg tablets, USP are round, white to off-white, film coated tablets debossed with “Andrx 674” on one side and “500” debossed on the other side.

Metformin hydrochloride 850 mg tablets, USP are round, white to off-white, film coated tablets debossed with “Andrx 675” on one side and “850” debossed on the other side.

Metformin hydrochloride 1000 mg tablets, USP are oval, white to off-white, film coated tablets with “Andrx 676” debossed on one side and bisected “1000” on the other side.

Metformin hydrochloride extended-release tablets, USP are available as: 500 mg Bottles of 90 NDC 62037-571-90 500 mg Bottles of 100 NDC 62037-571-01 500 mg Bottles of 500 NDC 62037-571-05 500 mg Bottles of 1000 NDC 62037-571-10 750 mg Bottles of 100 NDC 62037-577-01 750 mg Bottles of 500 NDC 62037-577-05 750 mg Bottles of 1000 NDC 62037-577-10 Metformin hydrochloride extended-release 500 mg tablets, USP are white to off-white, capsule shaped tablets, debossed with the and “571” on one side and “500” on the other side.

Metformin hydrochloride extended-release 750 mg tablets, USP are light yellow, capsule shaped tablets, debossed with and “577” on one side and “750” on opposite side.

Logo Logo Storage Store at controlled room temperature 20°-25°C (68°-77°F).

[See USP.] Dispense in light-resistant containers.

Metformin hydrochloride tablets, USP are manufactured by: Patheon Puerto Rico, Inc.

Caguas, Puerto Rico 00725, USA Distributed by: Watson Pharma, Inc.

Metformin hydrochloride extended-release tablets, USP are manufactured by: Watson Laboratories, Inc.

Corona, CA 92880 USA Distributed by: Watson Pharma, Inc.

Rev.

date 05/09 190733

GERIATRIC USE

Geriatric Use Controlled clinical studies of metformin hydrochloride tablets, USP and metformin hydrochloride extended-release tablets, USP did not include sufficient numbers of elderly patients to determine whether they respond differently from younger patients, although other reported clinical experience has not identified differences in responses between the elderly and younger patients.

Metformin is known to be substantially excreted by the kidney and because the risk of serious adverse reactions to the drug is greater in patients with impaired renal function, metformin hydrochloride tablets, USP, and metformin hydrochloride extended-release tablets, USP should only be used in patients with normal renal function (see CONTRAINDICATIONS , WARNINGS and CLINICAL PHARMACOLOGY: Pharmacokinetics ).

Because aging is associated with reduced renal function, metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP should be used with caution as age increases.

Care should be taken in dose selection and should be based on careful and regular monitoring of renal function.

Generally, elderly patients should not be titrated to the maximum dose of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP (see also WARNINGS and DOSAGE AND ADMINISTRATION ).

MECHANISM OF ACTION

Mechanism of Action Metformin is an antihyperglycemic agent which improves glucose tolerance in patients with type 2 diabetes, lowering both basal and postprandial plasma glucose.

Its pharmacologic mechanisms of action are different from other classes of oral antihyperglycemic agents.

Metformin decreases hepatic glucose production, decreases intestinal absorption of glucose and improves insulin sensitivity by increasing peripheral glucose uptake and utilization.

Unlike sulfonylureas, metformin does not produce hypoglycemia in either patients with type 2 diabetes or normal subjects (except in special circumstances, see PRECAUTIONS ) and does not cause hyperinsulinemia.

With metformin therapy, insulin secretion remains unchanged while fasting insulin levels and day-long plasma insulin response may actually decrease.

INDICATIONS AND USAGE

Metformin hydrochloride tablets, USP is indicated as an adjunct to diet and exercise to improve glycemic control in adults and children with type 2 diabetes mellitus.

Metformin hydrochloride extended-release tablets, USP is indicated as an adjunct to diet and exercise to improve glycemic control in adults with type 2 diabetes mellitus.

PEDIATRIC USE

Pediatric Use The safety and effectiveness of metformin hydrochloride tablets, USP for the treatment of type 2 diabetes have been established in pediatric patients ages 10 to 16 years (studies have not been conducted in pediatric patients below the age of 10 years).

Use of metformin hydrochloride tablets, USP in this age group is supported by evidence from adequate and well-controlled studies of metformin hydrochloride tablets, USP in adults with additional data from a controlled clinical study in pediatric patients ages 10 to 16 years with type 2 diabetes, which demonstrated a similar response in glycemic control to that seen in adults.

(See CLINICAL PHARMACOLOGY: Pediatric Clinical Studies.

) In this study, adverse effects were similar to those described in adults.

(See ADVERSE REACTIONS: Pediatric Patients.

) A maximum daily dose of 2000 mg is recommended.

(See DOSAGE AND ADMINISTRATION: Recommended Dosing Schedule: Pediatrics .

) Safety and effectiveness of metformin hydrochloride extended-release tablets, USP in pediatric patients have not been established.

PREGNANCY

Pregnancy Teratogenic Effects: Pregnancy Category B.

Recent information strongly suggests that abnormal blood glucose levels during pregnancy are associated with a higher incidence of congenital abnormalities.

Most experts recommend that insulin be used during pregnancy to maintain blood glucose levels as close to normal as possible.

Because animal reproduction studies are not always predictive of human response, metformin hydrochloride tablets, USP and metformin hydrochloride extended-release tablets, USP should not be used during pregnancy unless clearly needed.

There are no adequate and well-controlled studies in pregnant women with metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP.

Metformin was not teratogenic in rats and rabbits at doses up to 600 mg/kg/day.

This represents an exposure of about two and six times the maximum recommended human daily dose of 2000 mg based on body surface area comparisons for rats and rabbits, respectively.

Determination of fetal concentrations demonstrated a partial placental barrier to metformin.

NUSRING MOTHERS

Nursing Mothers Studies in lactating rats show that metformin is excreted into milk and reaches levels comparable to those in plasma.

Similar studies have not been conducted in nursing mothers.

Because the potential for hypoglycemia in nursing infants may exist, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.

If metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP are discontinued, and if diet alone is inadequate for controlling blood glucose, insulin therapy should be considered.

BOXED WARNING

WARNINGS Lactic Acidosis : Lactic acidosis is a rare, but serious, metabolic complication that can occur due to metformin accumulation during treatment with metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP; when it occurs, it is fatal in approximately 50% of cases.

Lactic acidosis may also occur in association with a number of pathophysiologic conditions, including diabetes mellitus, and whenever there is significant tissue hypoperfusion and hypoxemia.

Lactic acidosis is characterized by elevated blood lactate levels (>5 mmol/L), decreased blood pH, electrolyte disturbances with an increased anion gap, and an increased lactate/pyruvate ratio.

When metformin is implicated as the cause of lactic acidosis, metformin plasma levels >5 μg/mL are generally found.

The reported incidence of lactic acidosis in patients receiving metformin hydrochloride is very low (approximately 0.03 cases/1000 patient-years, with approximately 0.015 fatal cases/1000 patient-years).

In more than 20,000 patient-years exposure to metformin in clinical trials, there were no reports of lactic acidosis.

Reported cases have occurred primarily in diabetic patients with significant renal insufficiency, including both intrinsic renal disease and renal hypoperfusion, often in the setting of multiple concomitant medical/surgical problems and multiple concomitant medications.

Patients with congestive heart failure requiring pharmacologic management, in particular those with unstable or acute congestive heart failure who are at risk of hypoperfusion and hypoxemia, are at increased risk of lactic acidosis.

The risk of lactic acidosis increases with the degree of renal dysfunction and the patient’s age.

The risk of lactic acidosis may, therefore, be significantly decreased by regular monitoring of renal function in patients taking metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP and by use of the minimum effective dose of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP.

In particular, treatment of the elderly should be accompanied by careful monitoring of renal function.

Metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP treatment should not be initiated in patients ≥ 80 years of age unless measurement of creatinine clearance demonstrates that renal function is not reduced, as these patients are more susceptible to developing lactic acidosis.

In addition, metformin hydrochloride tablets, USP and metformin hydrochloride extended-release tablets, USP should be promptly withheld in the presence of any condition associated with hypoxemia, dehydration, or sepsis.

Because impaired hepatic function may significantly limit the ability to clear lactate, metformin hydrochloride tablets, USP and metformin hydrochloride extended-release tablets, USP should generally be avoided in patients with clinical or laboratory evidence of hepatic disease.

Patients should be cautioned against excessive alcohol intake, either acute or chronic, when taking metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP, since alcohol potentiates the effects of metformin hydrochloride on lactate metabolism.

In addition, metformin hydrochloride tablets, USP and metformin hydrochloride extended-release tablets, USP should be temporarily discontinued prior to any intravascular radiocontrast study and for any surgical procedure (see also PRECAUTIONS ).

The onset of lactic acidosis often is subtle, and accompanied only by nonspecific symptoms such as malaise, myalgias, respiratory distress, increasing somnolence, and nonspecific abdominal distress.

There may be associated hypothermia, hypotension, and resistant bradyarrhythmias with more marked acidosis.

The patient and the patient’s physician must be aware of the possible importance of such symptoms and the patient should be instructed to notify the physician immediately if they occur (see also PRECAUTIONS ).

Metformin hydrochloride tablets, USP and metformin hydrochloride extended-release tablets, USP should be withdrawn until the situation is clarified.

Serum electrolytes, ketones, blood glucose and- if indicated, blood pH, lactate levels, and even blood metformin levels may be useful.

Once a patient is stabilized on any dose level of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP, gastrointestinal symptoms, which are common during initiation of therapy, are unlikely to be drug related.

Later occurrence of gastrointestinal symptoms could be due to lactic acidosis or other serious disease.

Levels of fasting venous plasma lactate above the upper limit of normal but less than 5 mmol/L in patients taking metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP do not necessarily indicate impending lactic acidosis and may be explainable by other mechanisms, such as poorly controlled diabetes or obesity, vigorous physical activity, or technical problems in sample handling.

(See also PRECAUTIONS.

) Lactic acidosis should be suspected in any diabetic patient with metabolic acidosis lacking evidence of ketoacidosis (ketonuria and ketonemia).

Lactic acidosis is a medical emergency that must be treated in a hospital setting.

In a patient with lactic acidosis who is taking metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP, the drug should be discontinued immediately and general supportive measures promptly instituted.

Because metformin hydrochloride is dialyzable (with a clearance of up to 170 mL/min under good hemodynamic conditions), prompt hemodialysis is recommended to correct the acidosis and remove the accumulated metformin.

Such management often results in prompt reversal of symptoms and recovery.

(See also CONTRAINDICATIONS and PRECAUTIONS .)

INFORMATION FOR PATIENTS

Information for Patients Patients should be informed of the potential risks and benefits of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP and of alternative modes of therapy.

They should also be informed about the importance of adherence to dietary instructions, of a regular exercise program, and of regular testing of blood glucose, glycosylated hemoglobin, renal function and hematologic parameters.

The risks of lactic acidosis, its symptoms, and conditions that predispose to its development, as noted in the WARNINGS and PRECAUTIONS sections, should be explained to patients.

Patients should be advised to discontinue metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP immediately and to promptly notify their health practitioner if unexplained hyperventilation, myalgia, malaise, unusual somnolence or other nonspecific symptoms occur.

Once a patient is stabilized on any dose level of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP, gastrointestinal symptoms, which are common during initiation of metformin therapy, are unlikely to be drug related.

Later occurrence of gastrointestinal symptoms could be due to lactic acidosis or other serious disease.

Patients should be counseled against excessive alcohol intake, either acute or chronic, while receiving metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP.

Metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP alone does not usually cause hypoglycemia, although it may occur when metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP are used in conjunction with oral sulfonylureas and insulin.

When initiating combination therapy, the risks of hypoglycemia, its symptoms and treatment, and conditions that predispose to its development should be explained to patients.

(See Patient Information Printed Separately.) Patients should be informed that metformin hydrochloride extended-release tablets, USP must be swallowed whole and not crushed or chewed, and that the inactive ingredients may occasionally be eliminated in the feces as a soft mass that may resemble the original tablet.

DOSAGE AND ADMINISTRATION

There is no fixed dosage regimen for the management of hyperglycemia in patients with type 2 diabetes with metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP or any other pharmacologic agent.

Dosage of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP must be individualized on the basis of both effectiveness and tolerance, while not exceeding the maximum recommended daily dose.

The maximum recommended daily dose of metformin hydrochloride tablets, USP is 2550 mg in adults and 2000 mg in pediatric patients (10-16 years of age); the maximum recommended daily dose of metformin hydrochloride extended-release tablets, USP in adults is 2000 mg.

Metformin hydrochloride tablets, USP should be given in divided doses with meals while metformin hydrochloride extended-release tablets, USP should generally be given once daily with the evening meal.

Metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP should be started at a low dose, with gradual dose escalation, both to reduce gastrointestinal side effects and to permit identification of the minimum dose required for adequate glycemic control of the patient.

During treatment initiation and dose titration (see Recommended Dosing Schedule ), fasting plasma glucose should be used to determine the therapeutic response to metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP and identify the minimum effective dose for the patient.

Thereafter, glycosylated hemoglobin should be measured at intervals of approximately three months.

The therapeutic goal should be to decrease both fasting plasma glucose and glycosylated hemoglobin levels to normal or near normal by using the lowest effective dose of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP, either when used as monotherapy or in combination with sulfonylurea or insulin.

Monitoring of blood glucose and glycosylated hemoglobin will also permit detection of primary failure, i.e., inadequate lowering of blood glucose at the maximum recommended dose of medication, and secondary failure, i.e., loss of an adequate blood glucose lowering response after an initial period of effectiveness.

Short-term administration of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP may be sufficient during periods of transient loss of control in patients usually well-controlled on diet alone.

Metformin hydrochloride extended-release tablets, USP must be swallowed whole and never crushed or chewed.

Occasionally, the inactive ingredients of metformin hydrochloride extended-release will be eliminated in the feces as a soft, hydrated mass.

(See Patient Information printed separately.) Recommended Dosing Schedule Adults – In general, clinically significant responses are not seen at doses below 1500 mg per day.

However, a lower recommended starting dose and gradually increased dosage is advised to minimize gastrointestinal symptoms.

The usual starting dose of metformin hydrochloride tablets, USP is 500 mg twice a day or 850 mg once a day, given with meals.

Dosage increases should be made in increment of 500 mg weekly or 850 mg every 2 weeks, up to a total of 2000 mg per day, given in divided doses.

Patients can also be titrated from 500 mg twice a day to 850 mg twice a day after 2 weeks.

For those patients requiring additional glycemic control, metformin hydrochloride tablets, USP may be given to a maximum daily dose of 2550 mg per day.

Doses above 2000 mg may be better tolerated given three times a day with meals.

The usual starting dose of metformin hydrochloride extended-release tablets, USP is 500 mg once daily with the evening meal.

Dosage increases should be made in increments of 500 mg weekly, up to a maximum of 2000 mg once daily with the evening meal.

If glycemic control is not achieved on metformin hydrochloride extended-release tablets, USP 2000 mg once daily, a trial of metformin hydrochloride extended-release tablets, USP 1000 mg twice daily should be considered.

If higher doses of metformin hydrochloride tablets, USP are required, metformin hydrochloride tablets, USP should be used at total daily doses up to 2550 mg administered in divided daily doses, as described above.

(See CLINICAL PHARMACOLOGY, Clinical Studies .) In a randomized trial, patients currently treated with metformin hydrochloride tablets, USP were switched to metformin hydrochloride extended-release tablets, USP.

Results of this trial suggest that patients receiving metformin hydrochloride tablets, USP treatment may be safely switched to metformin hydrochloride extended-release tablets, USP once daily at the same total daily dose, up to 2000 mg once daily.

Following a switch from metformin hydrochloride tablets, USP to metformin hydrochloride extended-release tablets, USP glycemic control should be closely monitored and dosage adjustments made accordingly (see CLINICAL PHARMACOLOGY, Clinical Studies ).

Pediatrics – The usual starting dose of metformin hydrochloride tablets, USP is 500 mg twice a day, given with meals.

Dosage increases should be made in increments of 500 mg weekly up to a maximum of 2000 mg per day, given in divided doses.

Safety and effectiveness of metformin hydrochloride extended-release tablets, USP in pediatric patients have not been established.

Transfer from Other Antidiabetic Therapy When transferring patients from standard oral hypoglycemic agents other than chlorpropamide to metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP no transition period generally is necessary.

When transferring patients from chlorpropamide, care should be exercised during the first two weeks because of the prolonged retention of chlorpropamide in the body, leading to overlapping drug effects and possible hypoglycemia.

Concomitant Metformin Hydrochloride Tablets, USP or Metformin Hydrochloride Extended-release Tablets, USP and Oral Sulfonylurea Therapy in Adult Patients If patients have not responded to four weeks of the maximum dose of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP monotherapy, consideration should be given to gradual addition of an oral sulfonylurea while continuing metformin hydrochloride tablets, USP or metformin hydrochloride extendedrelease tablets, USP at the maximum dose, even if prior primary or secondary failure to a sulfonylurea has occurred.

Clinical and pharmacokinetic drug-drug interaction data are currently available only for metformin plus glyburide (glibenclamide).

With concomitant metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP and sulfonylurea therapy, the desired control of blood glucose may be obtained by adjusting the dose of each drug.

In a clinical trial of patients with type 2 diabetes and prior failure on glyburide, patients started on metformin hydrochloride tablets, USP 500 mg and glyburide 20 mg were titrated to 1000/20mg, 1500/20 mg, 2000/20 mg or 2500/20 mg of metformin hydrochloride tablets, USP and glyburide, respectively, to reach the goal of glycemic control as measured by FPG, HbA 1c and plasma glucose response (see CLINICAL PHARMACOLOGY: Clinical Studies ).

However, attempts should be made to identify the minimum effective dose of each drug to achieve this goal.

With concomitant metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP and sulfonylurea therapy, the risk of hypoglycemia associated with sulfonylurea therapy continues and may be increased.

Appropriate precautions should be taken.

(See Package Insert of the respective sulfonylurea.) If patients have not satisfactorily responded to one to three months of concomitant therapy with the maximum dose of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP and the maximum dose of an oral sulfonylurea, consider therapeutic alternatives including switching to insulin with or without metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP.

Concomitant Metformin Hydrochloride Tablets, USP or Metformin Hydrochloride Extended-release Tablets, USP and Insulin Therapy in Adult Patients The current insulin dose should be continued upon initiation of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP therapy.

Metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP should be initiated at 500 mg once daily in patients on insulin therapy.

For patients not responding adequately, the dose of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP should be increased by 500 mg after approximately 1 week and by 500 mg every week thereafter until adequate glycemic control is achieved.

The maximum recommended daily dose is 2500 mg for metformin hydrochloride tablets, USP and 2000 mg for metformin hydrochloride extended-release tablets, USP.

It is recommended that the insulin dose be decreased by 10% to 25% when fasting plasma glucose concentrations decrease to less than 120 mg/dL in patients receiving concomitant insulin and metformin hydrochloride tablets, USP or metformin hydrochlorideextended-release tablets, USP.

Further adjustment should be individualized based on glucose-lowering response.

Specific Patient Populations Metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP are not recommended for use in pregnancy.

Metformin hydrochloride tablets, USP are not recommended in patients below the age of 10 years.

Metformin hydrochloride extended-release tablets, USP are not recommended in pediatric patients (below the age of 17 years).

The initial and maintenance dosing of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP should be conservative in patients with advanced age, due to the potential for decreased renal function in this population.

Any dosage adjustment should be based on a careful assessment of renal function.

Generally, elderly, debilitated, and malnourished patients should not be titrated to the maximum dose of metformin hydrochloride tablets, USP or metformin hydrochloride extended-release tablets, USP.

Monitoring of renal function is necessary to aid in prevention of lactic acidosis, particularly in the elderly.

(See WARNINGS .)

palonosetron 0.25 MG in 5 ML Injection

DRUG INTERACTIONS

7 Palonosetron is eliminated from the body through both renal excretion and metabolic pathways with the latter mediated via multiple CYP enzymes.

Further in vitro studies indicated that palonosetron is not an inhibitor of CYP1A2, CYP2A6, CYP2B6, CYP2C9, CYP2D6, CYP2E1 and, CYP3A4/5 (CYP2C19 was not investigated) nor does it induce the activity of CYP1A2, CYP2D6, or CYP3A4/5.

Therefore, the potential for clinically significant drug interactions with palonosetron appears to be low.

Serotonin syndrome (including altered mental status, autonomic instability, and neuromuscular symptoms) has been described following the concomitant use of 5-HT 3 receptor antagonists and other serotonergic drugs, including selective serotonin reuptake inhibitors (SSRIs) and serotonin and noradrenaline reuptake inhibitors (SNRIs) [ see Warnings and Precautions (5.2) ].

Coadministration of 0.25 mg I.V.

palonosetron and 20 mg I.V.

dexamethasone in healthy subjects revealed no pharmacokinetic drug-interactions between palonosetron and dexamethasone.

In an interaction study in healthy subjects where palonosetron 0.25 mg (I.V.

bolus) was administered on day 1 and oral aprepitant for 3 days (125 mg/80 mg/80 mg), the pharmacokinetics of palonosetron were not significantly altered (AUC: no change, C max : 15% increase).

A study in healthy volunteers involving single-dose I.V.

palonosetron (0.75 mg) and steady state oral metoclopramide (10 mg four times daily) demonstrated no significant pharmacokinetic interaction.

In controlled clinical trials, ALOXI injection has been safely administered with corticosteroids, analgesics, antiemetics/antinauseants, antispasmodics and anticholinergic agents.

Palonosetron did not inhibit the antitumor activity of the five chemotherapeutic agents tested (cisplatin, cyclophosphamide, cytarabine, doxorubicin, and mitomycin C) in murine tumor models.

The potential for clinically significant drug interactions with palonosetron appears to be low ( 7 )

OVERDOSAGE

10 There is no known antidote to ALOXI.

Overdose should be managed with supportive care.

Fifty adult cancer patients were administered palonosetron at a dose of 90 mcg/kg (equivalent to 6 mg fixed dose) as part of a dose ranging study.

This is approximately 25 times the recommended dose of 0.25 mg.

This dose group had a similar incidence of adverse events compared to the other dose groups and no dose response effects were observed.

Dialysis studies have not been performed, however, due to the large volume of distribution, dialysis is unlikely to be an effective treatment for palonosetron overdose.

A single intravenous dose of palonosetron at 30 mg/kg (947 and 474 times the human dose for rats and mice, respectively, based on body surface area) was lethal to rats and mice.

The major signs of toxicity were convulsions, gasping, pallor, cyanosis, and collapse.

DESCRIPTION

11 ALOXI (palonosetron hydrochloride) is an antiemetic and antinauseant agent.

It is a serotonin-3 (5-HT 3 ) receptor antagonist with a strong binding affinity for this receptor.

Chemically, palonosetron hydrochloride is: (3a S) -2-[( S )-1-Azabicyclo [2.2.2]oct-3-yl]-2,3,3a,4,5,6-hexahydro-1-oxo-1 H benz[ de ]isoquinoline hydrochloride.

The empirical formula is C 19 H 24 N 2 O.HCl, with a molecular weight of 332.87.

Palonosetron hydrochloride exists as a single isomer and has the following structural formula: Palonosetron hydrochloride is a white to off-white crystalline powder.

It is freely soluble in water, soluble in propylene glycol, and slightly soluble in ethanol and 2-propanol.

ALOXI injection is a sterile, clear, colorless, nonpyrogenic, isotonic, buffered solution for intravenous administration.

ALOXI injection is available as 5 mL single use vial or 1.5 mL single use vial.

Each 5 mL vial contains 0.25 mg palonosetron base as 0.28 mg palonosetron hydrochloride, 207.5 mg mannitol, disodium edetate and citrate buffer in water for intravenous administration.

Each 1.5 mL vial contains 0.075 mg palonosetron base as 0.084 mg palonosetron hydrochloride, 62.25 mg mannitol, disodium edetate and citrate buffer in water for intravenous administration.

The pH of the solution in the 5 mL and 1.5 mL vials is 4.5 to 5.5.

The structural formula for serotonin-3 (5-HT3) is a receptor antagonist with a strong binding affinity for this receptor.

Chemically, palonosetron hydrochloride is: (3aS)-2-[(S)-1-Azabicyclo [2.2.2]oct-3-yl]-2,3,3a,4,5,6-hexahydro-1-oxo-1Hbenz[de]isoquinoline hydrochloride.

The empirical formula is C19H24N2O.HCl, with a molecular weight of 332.87.

CLINICAL STUDIES

14 97.5% Confidence Interval ALOXI minus Comparator c 97.5% Confidence Interval ALOXI minus Comparator c 97.5% Confidence Interval ALOXI minus Comparator c 14.1 Chemotherapy-Induced Nausea and Vomiting in Adults Efficacy of single-dose palonosetron injection in preventing acute and delayed nausea and vomiting induced by both moderately and highly emetogenic chemotherapy was studied in three Phase 3 trials and one Phase 2 trial.

In these double-blind studies, complete response rates (no emetic episodes and no rescue medication) and other efficacy parameters were assessed through at least 120 hours after administration of chemotherapy.

The safety and efficacy of palonosetron in repeated courses of chemotherapy was also assessed.

Moderately Emetogenic Chemotherapy Two Phase 3, double-blind trials involving 1132 patients compared single-dose I.V.

ALOXI with either single-dose I.V.

ondansetron (study 1) or dolasetron (study 2) given 30 minutes prior to moderately emetogenic chemotherapy including carboplatin, cisplatin ≤ 50 mg/m², cyclophosphamide 25 mg/m², epirubicin, irinotecan, and methotrexate > 250 mg/m².

Concomitant corticosteroids were not administered prophylactically in study 1 and were only used by 4-6% of patients in study 2.

The majority of patients in these studies were women (77%), White (65%) and naïve to previous chemotherapy (54%).

The mean age was 55 years.

Highly Emetogenic Chemotherapy A Phase 2, double-blind, dose-ranging study evaluated the efficacy of single-dose I.V.

palonosetron from 0.3 to 90 mcg/kg (equivalent to 1100 mg/m²).

Concomitant corticosteroids were not administered prophylactically.

Analysis of data from this trial indicates that 0.25 mg is the lowest effective dose in preventing acute nausea and vomiting induced by highly emetogenic chemotherapy.

A Phase 3, double-blind trial involving 667 patients compared single-dose I.V.

ALOXI with single-dose I.V.

ondansetron (study 3) given 30 minutes prior to highly emetogenic chemotherapy including cisplatin ≥ 60 mg/m², cyclophosphamide > 1500 mg/m², and dacarbazine.

Corticosteroids were co-administered prophylactically before chemotherapy in 67% of patients.

Of the 667 patients, 51% were women, 60% White, and 59% naïve to previous chemotherapy.

The mean age was 52 years.

Efficacy Results The antiemetic activity of ALOXI was evaluated during the acute phase (0-24 hours) [Table 4], delayed phase (24-120 hours) [Table 5], and overall phase (0-120 hours) [Table 6] post-chemotherapy in Phase 3 trials.

Table 4: Prevention of Acute Nausea and Vomiting (0-24 hours): Complete Response Rates Chemotherapy Study Treatment Group N a % with Complete Response p-value b 97.5% Confidence Interval ALOXI minus Comparator c Moderately Emetogenic 1 ALOXI 0.25 mg 189 81 0.009 Ondansetron 32 mg I.V.

185 69 2 ALOXI 0.25 mg 189 63 NS Dolasetron 100 mg I.V.

191 53 Highly Emetogenic 3 ALOXI 0.25 mg 223 59 NS Difference in Complete Response Rates Ondansetron 32 mg I.V.

221 57 a Intent-to-treat cohort b 2-sided Fisher’s exact test.

Significance level at α=0.025.

c These studies were designed to show non-inferiority.

A lower bound greater than –15% demonstrates non-inferiority between ALOXI and comparator.

These studies show that ALOXI was effective in the prevention of acute nausea and vomiting associated with initial and repeat courses of moderately and highly emetogenic cancer chemotherapy.

In study 3, efficacy was greater when prophylactic corticosteroids were administered concomitantly.

Clinical superiority over other 5-HT 3 receptor antagonists has not been adequately demonstrated in the acute phase.

Table 5: Prevention of Delayed Nausea and Vomiting (24-120 hours): Complete Response Rates Chemotherapy Study Treatment Group N a % with Complete Response p-value b 97.5% Confidence Interval ALOXI minus Comparator c Moderately Emetogenic 1 ALOXI 0.25 mg 189 74 <0.001 Ondansetron 32 mg I.V.

185 55 2 ALOXI 0.25 mg 189 54 0.004 Dolasetron 100 mg I.V.

191 39 Difference in Complete Response Rates a Intent-to-treat cohort b 2-sided Fisher’s exact test.

Significance level at α=0.025.

c These studies were designed to show non-inferiority.

A lower bound greater than –15% demonstrates non-inferiority between ALOXI and comparator.

These studies show that ALOXI was effective in the prevention of delayed nausea and vomiting associated with initial and repeat courses of moderately emetogenic chemotherapy.

Table 6: Prevention of Overall Nausea and Vomiting (0-120 hours): Complete Response Rates Chemotherapy Study Treatment Group N a % with Complete Response p-value b 97.5% Confidence Interval ALOXI minus Comparator c Moderately Emetogenic 1 ALOXI 0.25 mg 189 69 <0.001 Ondansetron 32 mg I.V.

185 50 2 ALOXI 0.25 mg 189 46 0.021 Dolasetron 100 mg I.V.

191 34 Difference in Complete Response Rates a Intent-to-treat cohort b 2-sided Fisher’s exact test.

Significance level at α=0.025.

c These studies were designed to show non-inferiority.

A lower bound greater than –15% demonstrates non inferiority between ALOXI and comparator.

These studies show that ALOXI was effective in the prevention of nausea and vomiting throughout the 120 hours (5 days) following initial and repeat courses of moderately emetogenic cancer chemotherapy.

14.2 Chemotherapy-Induced Nausea and Vomiting in Pediatrics One double-blind, active-controlled clinical trial was conducted in pediatric cancer patients.

The total population (N = 327) had a mean age of 8.3 years (range 2 months to 16.9 years) and were 53% male; and 96% white.

Patients were randomized and received a 20 mcg/kg (maximum 1.5 mg) intravenous infusion of ALOXI 30 minutes prior to the start of emetogenic chemotherapy (followed by placebo infusions 4 and 8 hours after the dose of palonosetron) or 0.15 mg/kg of intravenous ondansetron 30 minutes prior to the start of emetogenic chemotherapy (followed by ondansetron 0.15 mg/kg infusions 4 and 8 hours after the first dose of ondansetron, with a maximum total dose of 32 mg).

Emetogenic chemotherapies administered included doxorubicin, cyclophosphamide (<1500 mg/m 2 ), ifosfamide, cisplatin, dactinomycin, carboplatin, and daunorubicin.

Adjuvant corticosteroids, including dexamethasone, were administered with chemotherapy in 55% of patients.

Complete Response in the acute phase of the first cycle of chemotherapy was defined as no vomiting, no retching, and no rescue medication in the first 24 hours after starting chemotherapy.

Efficacy was based on demonstrating non-inferiority of intravenous palonosetron compared to intravenous ondansetron.

Non-inferiority criteria were met if the lower bound of the 97.5% confidence interval for the difference in Complete Response rates of intravenous palonosetron minus intravenous ondansetron was larger than -15%.

The non-inferiority margin was 15%.

Efficacy Results As shown in Table 7, intravenous ALOXI 20 mcg/kg (maximum 1.5 mg) demonstrated non-inferiority to the active comparator during the 0 to 24 hour time interval.

Table 7: Prevention of Acute Nausea and Vomiting (0-24 hours): Complete Response Rates I.V.

ALOXI 20 mcg/kg (N=165) I.V.

Ondansetron 0.15 mg/kg x 3 (N=162) Difference [97.5% Confidence Interval]*: I.V.

ALOXI minus I.V.

Ondansetron Comparator 59.4% 58.6% 0.36% [-11.7%, 12.4%] * To adjust for multiplicity of treatment groups, a lower-bound of a 97.5% confidence interval was used to compare to -15%, the negative value of the non-inferiority margin.

In patients that received ALOXI at a lower dose than the recommended dose of 20 mcg/kg, non-inferiority criteria were not met.

14.3 Postoperative Nausea and Vomiting In one multicenter, randomized, stratified, double-blind, parallel-group, phase 3 clinical study (Study 1), palonosetron was compared with placebo for the prevention of PONV in 546 patients undergoing abdominal and gynecological surgery.

All patients received general anesthesia.

Study 1 was a pivotal study conducted predominantly in the US in the out-patient setting for patients undergoing elective gynecologic or abdominal laparoscopic surgery and stratified at randomization for the following risk factors: gender, non-smoking status, history of post operative nausea and vomiting and/or motion sickness.

In Study 1 patients were randomized to receive palonosetron 0.025 mg, 0.050 mg or 0.075 mg or placebo, each given intravenously immediately prior to induction of anesthesia.

The antiemetic activity of palonosetron was evaluated during the 0 to 72 hour time period after surgery.

Of the 138 patients treated with 0.075 mg palonosetron in Study 1 and evaluated for efficacy, 96% were women; 66% had a history of PONV or motion sickness; 85% were non-smokers.

As for race, 63% were White, 20% were Black, 15% were Hispanic, and 1% were Asian.

The age of patients ranged from 21 to 74 years, with a mean age of 37.9 years.

Three patients were greater than 65 years of age.

Co-primary efficacy measures were Complete Response (CR) defined as no emetic episode and no use of rescue medication in the 0-24 and in the 24-72 hours postoperatively.

Secondary efficacy endpoints included: Complete Response (CR) 0-48 and 0-72 hours Complete Control (CC) defined as CR and no more than mild nausea Severity of nausea (none, mild, moderate, severe) The primary hypothesis in Study 1 was that at least one of the three palonosetron doses were superior to placebo.

Results for Complete Response in Study 1 for 0.075 mg palonosetron versus placebo are described in the following table.

Table 8: Prevention of Postoperative Nausea and Vomiting: Complete Response (CR), Study 1, Palonosetron 0.075 mg Vs Placebo Treatment n/N (%) Palonosetron Vs Placebo Δ p-value* Co-primary Endpoints CR 0-24 hours Palonosetron 59/138 (42.8%) 16.8% 0.004 Placebo 35/135 (25.9%) CR 24-72 hours Palonosetron 67/138 (48.6%) 7.8% 0.188 Placebo 55/135 (40.7%) * To reach statistical significance for each co-primary endpoint, the required significance limit for the lowest p-value was p<0.017.

Δ Difference (%): palonosetron 0.075 mg minus placebo Palonosetron 0.075 mg reduced the severity of nausea compared to placebo.

Analyses of other secondary endpoints indicate that palonosetron 0.075 mg was numerically better than placebo, however, statistical significance was not formally demonstrated.

A phase 2 randomized, double-blind, multicenter, placebo-controlled, dose ranging study was performed to evaluate I.V.

palonosetron for the prevention of post-operative nausea and vomiting following abdominal or vaginal hysterectomy.

Five I.V.

palonosetron doses (0.1, 0.3, 1.0, 3.0, and 30 µg/kg) were evaluated in a total of 381 intent-to-treat patients.

The primary efficacy measure was the proportion of patients with CR in the first 24 hours after recovery from surgery.

The lowest effective dose was palonosetron 1 µg/kg (approximately 0.075 mg) which had a CR rate of 44% versus 19% for placebo, p=0.004.

Palonosetron 1 µg/kg also significantly reduced the severity of nausea versus placebo, p=0.009.

HOW SUPPLIED

16 /STORAGE AND HANDLING NDC # 62856-797-01, ALOXI Injection 0.25 mg/5 mL (free base) single-use vial individually packaged in a carton.

NDC # 62856-798-01, ALOXI Injection 0.075 mg/1.5 mL (free base) single-use vial packaged in a carton containing 5 vials.

Storage Store at controlled temperature of 20–25°C (68°F–77°F).

Excursions permitted to 15–30°C (59-86°F).

Protect from freezing.

Protect from light.

RECENT MAJOR CHANGES

Indication ( 1.2 ) Dosage and Administration, Pediatric Cancer Patients ( 2.1 ) Warnings and Precautions, Serotonin Syndrome ( 5.2 ) 05/2014 05/2014 09/2014

GERIATRIC USE

8.5 Geriatric Use Population pharmacokinetics analysis did not reveal any differences in palonosetron pharmacokinetics between cancer patients ≥ 65 years of age and younger patients (18 to 64 years).

Of the 1374 adult cancer patients in clinical studies of palonosetron, 316 (23%) were ≥ 65 years old, while 71 (5%) were ≥ 75 years old.

No overall differences in safety or effectiveness were observed between these subjects and the younger subjects, but greater sensitivity in some older individuals cannot be ruled out.

No dose adjustment or special monitoring are required for geriatric patients.

Of the 1520 adult patients in ALOXI PONV clinical studies, 73 (5%) were ≥65 years old.

No overall differences in safety were observed between older and younger subjects in these studies, though the possibility of heightened sensitivity in some older individuals cannot be excluded.

No differences in efficacy were observed in geriatric patients for the CINV indication and none are expected for geriatric PONV patients.

However, ALOXI efficacy in geriatric patients has not been adequately evaluated.

DOSAGE FORMS AND STRENGTHS

3 ALOXI is supplied as a single-use sterile, clear, colorless solution in glass vials that provide: 0.25 mg (free base) per 5 mL (concentration: 0.05 mg/mL, 50 mcg/mL) 0.075 mg (free base) per 1.5 mL (concentration: 0.05 mg/mL, 50 mcg/mL) 0.25 mg/5mL (free base) single-use vial ( 3 ) 0.075 mg/1.5mL (free base) single-use vial ( 3 )

MECHANISM OF ACTION

12.1 Mechanism of Action Palonosetron is a 5-HT 3 receptor antagonist with a strong binding affinity for this receptor and little or no affinity for other receptors.

Cancer chemotherapy may be associated with a high incidence of nausea and vomiting, particularly when certain agents, such as cisplatin, are used.

5-HT 3 receptors are located on the nerve terminals of the vagus in the periphery and centrally in the chemoreceptor trigger zone of the area postrema.

It is thought that chemotherapeutic agents produce nausea and vomiting by releasing serotonin from the enterochromaffin cells of the small intestine and that the released serotonin then activates 5-HT 3 receptors located on vagal afferents to initiate the vomiting reflex.

Postoperative nausea and vomiting is influenced by multiple patient, surgical, and anesthesia related factors and is triggered by release of 5-HT in a cascade of neuronal events involving both the central nervous system and the gastrointestinal tract.

The 5-HT 3 receptor has been demonstrated to selectively participate in the emetic response.

INDICATIONS AND USAGE

1 ALOXI is a serotonin-3 (5-HT 3 ) receptor antagonist indicated in adults for: Moderately emetogenic cancer chemotherapy — prevention of acute and delayed nausea and vomiting associated with initial and repeat courses ( 1.1 ) Highly emetogenic cancer chemotherapy — prevention of acute nausea and vomiting associated with initial and repeat courses ( 1.1 ) Prevention of postoperative nausea and vomiting (PONV) for up to 24 hours following surgery.

Efficacy beyond 24 hours has not been demonstrated ( 1.3 ) ALOXI is indicated in pediatric patients aged 1 month to less than 17 years for: Prevention of acute nausea and vomiting associated with initial and repeat courses of emetogenic cancer chemotherapy, including highly emetogenic cancer chemotherapy ( 1.2 ) 1.1 Chemotherapy -Induced Nausea and Vomiting in Adults ALOXI is indicated for: Moderately emetogenic cancer chemotherapy — prevention of acute and delayed nausea and vomiting associated with initial and repeat courses Highly emetogenic cancer chemotherapy — prevention of acute nausea and vomiting associated with initial and repeat courses 1.2 Chemotherapy-Induced Nausea and Vomiting in Pediatric Patients Aged 1 M onth to Less than 17 Years ALOXI is indicated for prevention of acute nausea and vomiting associated with initial and repeat courses of emetogenic cancer chemotherapy, including highly emetogenic cancer chemotherapy.

1.3 Postoperative Nausea and Vo miting in Adults ALOXI is indicated for prevention of postoperative nausea and vomiting (PONV) for up to 24 hours following surgery.

Efficacy beyond 24 hours has not been demonstrated.

As with other antiemetics, routine prophylaxis is not recommended in patients in whom there is little expectation that nausea and/or vomiting will occur postoperatively.

In patients where nausea and vomiting must be avoided during the postoperative period, ALOXI is recommended even where the incidence of postoperative nausea and/or vomiting is low.

PEDIATRIC USE

8.4 Pediatric Use Chemotherapy-Induced Nausea and Vomiting Safety and effectiveness of ALOXI have been established in pediatric patients aged 1 month to less than 17 years for the prevention of acute nausea and vomiting associated with initial and repeat courses of emetogenic cancer chemotherapy, including highly emetogenic cancer chemotherapy.

Use is supported by a clinical trial where 165 pediatric patients aged 2 months to <17 years were randomized to receive a single dose of palonosetron 20 mcg/kg (maximum 1.5 mg) administered as an intravenous infusion 30 minutes prior to the start of emetogenic chemotherapy [ see Clinical Studies (14.2) ] .

While this study demonstrated that pediatric patients require a higher palonosetron dose than adults to prevent chemotherapy-induced nausea and vomiting, the safety profile is consistent with the established profile in adults [ see Adverse Reactions (6.1) ] .

Safety and effectiveness of ALOXI in neonates (less than 1 month of age) have not been established.

Postoperative Nausea and Vomiting Studies Safety and efficacy have not been established in pediatric patients for prevention of postoperative nausea and vomiting.

Two pediatric trials were performed.

Pediatric Study 1, a dose finding study, was conducted to compare two doses of palonosetron, 1 mcg/kg (max 0.075 mg) versus 3 mcg/kg (max 0.25 mg).

A total of 150 pediatric surgical patients participated, age range 1 month to <17 years.

No dose response was observed.

Pediatric Study 2, a multicenter, double-blind, double-dummy, randomized, parallel group, active control, single-dose non-inferiority study, compared I.V.

palonosetron (1 mcg/kg, max 0.075 mg) versus I.V.

ondansetron.

A total of 670 pediatric surgical patients participated, age 30 days to <17 years.

The primary efficacy endpoint, Complete Response (CR: no vomiting, no retching, and no antiemetic rescue medication) during the first 24 hours postoperatively was achieved in 78.2% of patients in the palonosetron group and 82.7% in the ondansetron group.

Given the pre-specified non-inferiority margin of -10%, the stratum adjusted Mantel-Haenszel statistical non-inferiority confidence interval for the difference in the primary endpoint, complete response (CR), was [-10.5, 1.7%], therefore non-inferiority was not demonstrated.

Adverse reactions to palonosetron were similar to those reported in adults (Table 2).

PREGNANCY

8.1 Pregnancy Pregnancy Category B Risk Summary Adequate and well controlled studies with ALOXI have not been conducted in pregnant women.

In animal reproduction studies, no effects on embryo-fetal development were observed with the administration of oral palonosetron during the period of organogenesis at doses up to 1894 and 3789 times the recommended human intravenous dose in rats and rabbits, respectively.

Because animal reproduction studies are not always predictive of human response, ALOXI should be used during pregnancy only if clearly needed.

Animal Data In animal studies, no effects on embryo-fetal development were observed in pregnant rats given oral palonosetron at doses up to 60 mg/kg/day (1894 times the recommended human intravenous dose based on body surface area) or pregnant rabbits given oral doses up to 60 mg/kg/day (3789 times the recommended human intravenous dose based on body surface area) during the period of organogenesis.

NUSRING MOTHERS

8.3 Nursing Mothers It is not known whether ALOXI is present in human milk.

Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants and the potential for tumorigenicity shown for palonosetron in the rat carcinogenicity study [ see Nonclinical Toxicology (13.1) ] , a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.

WARNING AND CAUTIONS

5 WARNINGS AND PRECAUTIONS Hypersensitivity reactions, including anaphylaxis, have been reported with or without known hypersensitivity to other selective 5-HT 3 receptor antagonists ( 5.1 ) Serotonin syndrome has been reported with 5-HT 3 receptor antagonists alone but particularly with concomitant use of serotonergic drugs ( 5.2 ) 5.1 Hypersensitivity Hypersensitivity reactions, including anaphylaxis, have been reported with or without known hypersensitivity to other 5-HT 3 receptor antagonists.

5.2 Serotonin Syndrome The development of serotonin syndrome has been reported with 5-HT 3 receptor antagonists.

Most reports have been associated with concomitant use of serotonergic drugs (e.g., selective serotonin reuptake inhibitors (SSRIs), serotonin and norepinephrine reuptake inhibitors (SNRIs), monoamine oxidase inhibitors, mirtazapine, fentanyl, lithium, tramadol, and intravenous methylene blue).

Some of the reported cases were fatal.

Serotonin syndrome occurring with overdose of another 5-HT 3 receptor antagonist alone has also been reported.

The majority of reports of serotonin syndrome related to 5-HT 3 receptor antagonist use occurred in a post-anesthesia care unit or an infusion center.

Symptoms associated with serotonin syndrome may include the following combination of signs and symptoms: mental status changes (e.g., agitation, hallucinations, delirium, and coma), autonomic instability (e.g., tachycardia, labile blood pressure, dizziness, diaphoresis, flushing, hyperthermia), neuromuscular symptoms (e.g., tremor, rigidity, myoclonus, hyperreflexia, incoordination), seizures, with or without gastrointestinal symptoms (e.g., nausea, vomiting, diarrhea).

Patients should be monitored for the emergence of serotonin syndrome, especially with concomitant use of ALOXI and other serotonergic drugs.

If symptoms of serotonin syndrome occur, discontinue ALOXI and initiate supportive treatment.

Patients should be informed of the increased risk of serotonin syndrome, especially if ALOXI is used concomitantly with other serotonergic drugs [see Drug Interactions (7), Patient Counseling Information (17) ] .

INFORMATION FOR PATIENTS

17 PATIENT COUNSELING INFORMATION See FDA-approved patient labelling ( Patient Information ).

Instructions for Patients Patients should be advised to report to their physician all of their medical conditions, including any pain, redness, or swelling in and around the infusion site [see Adverse Reactions (6.3) ].

Advise patients of the possibility of serotonin syndrome, especially with concomitant use of ALOXI and another serotonergic agent such as medications to treat depression and migraines.

Advise patients to seek immediate medical attention if the following symptoms occur: changes in mental status, autonomic instability, neuromuscular symptoms with or without gastrointestinal symptoms [ see Warnings and Precautions (5.2) ].

Patients should be instructed to read the Patient Information.

DOSAGE AND ADMINISTRATION

2 Chemotherapy-Induced Nausea and Vomiting ( 2.1 ) Age Dose* Infusion Time Adults 0 .

2 5 m g x 1 Infuse over 3 0 s e c o nd s beginning approx.

30 min before the start of chemo Pediatrics (1 month to less than 17 years) 2 0 m icr o g r a m s p er k il o g r a m (max 1.5 mg) x 1 Infuse over 1 5 m i nut es beginning approx.

30 min before the start of chemo *Note different dosing units in pediatrics Postoperative Nausea and Vomiting ( 2.1 ) Adult Dosage: a single 0.075 mg intravenous dose administered over 10 seconds immediately before the induction of anesthesia.

2.1 Recommended Dosing Chemotherapy-Induced Nausea and Vomiting Age Dose* Infusion Time Adults 0 .

2 5 m g x 1 Infuse over 3 0 s e c o nd s beginning approx.

30 min before the start of chemo Pediatrics (1 month to less than 17 years) 2 0 m icr o g r a m s p er k il o g r a m (max 1.5 mg) x 1 Infuse over 1 5 m i nut es beginning approx.

30 min before the start of chemo *Note different dosing units in pediatrics Postoperative Nausea and Vomiting Dosage for Adults – a single 0.075 mg intravenous dose administered over 10 seconds immediately before the induction of anesthesia.

2.2 Instructions for I ntravenous Administration ALOXI is supplied ready for intravenous administration at a concentration of 0.05 mg/mL (50 mcg/ mL).

ALOXI should not be mixed with other drugs.

The infusion line should be flushed with normal saline before and after administration of ALOXI.

Parenteral drug products should be inspected visually for particulate matter and discoloration before administration, whenever solution and container permit.

sertraline HCl 50 MG Oral Tablet

WARNINGS

Clinical Worsening and Suicide Risk Patients with major depressive disorder (MDD), both adult and pediatric, may experience worsening of their depression and/or the emergence of suicidal ideation and behavior (suicidality) or unusual changes in behavior, whether or not they are taking antidepressant medications, and this risk may persist until significant remission occurs.

Suicide is a known risk of depression and certain other psychiatric disorders, and these disorders themselves are the strongest predictors of suicide.

There has been a long-standing concern, however, that antidepressants may have a role in inducing worsening of depression and the emergence of suicidality in certain patients during the early phases of treatment.

Pooled analyses of short-term placebo-controlled trials of antidepressant drugs (SSRIs and others) showed that these drugs increase the risk of suicidal thinking and behavior (suicidality) in children, adolescents, and young adults (ages 18-24) with major depressive disorder (MDD) and other psychiatric disorders.

Short-term studies did not show an increase in the risk of suicidality with antidepressants compared to placebo in adults beyond age 24; there was a reduction with antidepressants compared to placebo in adults aged 65 and older.

The pooled analyses of placebo-controlled trials in children and adolescents with MDD, obsessive compulsive disorder (OCD), or other psychiatric disorders included a total of 24 short-term trials of 9 antidepressant drugs in over 4400 patients.

The pooled analyses of placebo-controlled trials in adults with MDD or other psychiatric disorders included a total of 295 short-term trials (median duration of 2 months) of 11 antidepressant drugs in over 77,000 patients.

There was considerable variation in risk of suicidality among drugs, but a tendency toward an increase in the younger patients for almost all drugs studied.

There were differences in absolute risk of suicidality across the different indications, with the highest incidence in MDD.

The risk differences (drug vs placebo), however, were relatively stable within age strata and across indications.

The risk differences (drug-placebo differences in the number of cases of suicidality per 1000 patients treated) are provided in Table 1.

Table 1 Age Range Drug-Placebo Difference in Number of Cases of Suicidality per 1000 Patients Treated Increases Compared to Placebo <18 14 additional cases 18–24 5 additional cases Decreases Compared to Placebo 25–64 1 fewer case ≥65 6 fewer cases No suicides occurred in any of the pediatric trials.

There were suicides in the adult trials, but the number was not sufficient to reach any conclusion about drug effect on suicide.

It is unknown whether the suicidality risk extends to longer-term use, i.e., beyond several months.

However, there is substantial evidence from placebo-controlled maintenance trials in adults with depression that the use of antidepressants can delay the recurrence of depression.

All patients being treated with antidepressants for any indication should be monitored appropriately and observed closely for clinical worsening, suicidality, and unusual changes in behavior, especially during the initial few months of a course of drug therapy, or at times of dose changes, either increases or decreases.

The following symptoms, anxiety, agitation, panic attacks, insomnia, irritability, hostility, aggressiveness, impulsivity, akathisia (psychomotor restlessness), hypomania, and mania, have been reported in adult and pediatric patients being treated with antidepressants for major depressive disorder as well as for other indications, both psychiatric and nonpsychiatric.

Although a causal link between the emergence of such symptoms and either the worsening of depression and/or the emergence of suicidal impulses has not been established, there is concern that such symptoms may represent precursors to emerging suicidality.

Consideration should be given to changing the therapeutic regimen, including possibly discontinuing the medication, in patients whose depression is persistently worse, or who are experiencing emergent suicidality or symptoms that might be precursors to worsening depression or suicidality, especially if these symptoms are severe, abrupt in onset, or were not part of the patient’s presenting symptoms.

If the decision has been made to discontinue treatment, medication should be tapered, as rapidly as is feasible, but with recognition that abrupt discontinuation can be associated with certain symptoms (see PRECAUTIONS and DOSAGE AND ADMINISTRATION—Discontinuation of Treatment with sertraline hydrochloride, for a description of the risks of discontinuation of sertraline hydrochloride).

Families and caregivers of patients being treated with antidepressants for major depressive disorder or other indications, both psychiatric and nonpsychiatric , should be alerted about the need to monitor patients for the emergence of agitation, irritability, unusual changes in behavior, and the other symptoms described above, as well as the emergence of suicidality, and to report such symptoms immediately to health care providers.

Such monitoring should include daily observation by families and caregivers.

Prescriptions for sertraline hydrochloride should be written for the smallest quantity of tablets consistent with good patient management, in order to reduce the risk of overdose.

Screening Patients for Bipolar Disorder A major depressive episode may be the initial presentation of bipolar disorder.

It is generally believed (though not established in controlled trials) that treating such an episode with an antidepressant alone may increase the likelihood of precipitation of a mixed/manic episode in patients at risk for bipolar disorder.

Whether any of the symptoms described above represent such a conversion is unknown.

However, prior to initiating treatment with an antidepressant, patients with depressive symptoms should be adequately screened to determine if they are at risk for bipolar disorder; such screening should include a detailed psychiatric history, including a family history of suicide, bipolar disorder, and depression.

It should be noted that sertraline hydrochloride is not approved for use in treating bipolar depression.

Cases of serious sometimes fatal reactions have been reported in patients receiving sertraline hydrochloride, a selective serotonin reuptake inhibitor (SSRI), in combination with a monoamine oxidase inhibitor (MAOI).

Symptoms of a drug interaction between an SSRI and an MAOI include: hyperthermia, rigidity, myoclonus, autonomic instability with possible rapid fluctuations of vital signs, mental status changes that include confusion, irritability, and extreme agitation progressing to delirium and coma.

These reactions have also been reported in patients who have recently discontinued an SSRI and have been started on an MAOI.

Some cases presented with features resembling neuroleptic malignant syndrome.

Therefore, sertraline hydrochloride should not be used in combination with an MAOI, or within 14 days of discontinuing treatment with an MAOI.

Similarly, at least 14 days should be allowed after stopping sertraline hydrochloride before starting an MAOI.

The concomitant use of sertraline hydrochloride with MAOIs intended to treat depression is contraindicated (see CONTRAINDICATIONS and – Potential for Interaction with Monoamine Oxidase Inhibitors ).

Serotonin Syndrome or Neuroleptic Malignant Syndrome (NMS)-like Reactions: The development of a potentially life-threatening serotonin syndrome or Neuroleptic Malignant Syndrome (NMS)-like reactions have been reported with SNRIs and SSRIs alone, including sertraline hydrochloride treatment, but particularly with concomitant use of serotonergic drugs (including triptans and fentanyl) and with drugs which impair metabolism of serotonin (including MAOIs), or with antipsychotics or other dopamine antagonists.

Serotonin syndrome symptoms may include mental status changes (e.g., agitation, hallucinations, coma), autonomic instability (e.g., tachycardia, labile blood pressure, hyperthermia), neuromuscular aberrations (e.g., hyperreflexia, incoordination) and/or gastrointestinal symptoms (e.g., nausea, vomiting, diarrhea).

Serotonin syndrome, in its most severe form can resemble neuroleptic malignant syndrome, which includes hyperthermia, muscle rigidity, autonomic instability with possible rapid fluctuation of vital signs, and mental status changes.

Patients should be monitored for the emergence of serotonin syndrome or NMS-like signs and symptoms.

The concomitant use of sertraline hydrochloride with MAOIs intended to treat depression is contraindicated.

If concomitant treatment of sertraline hydrochloride, with a 5-hydroxytryptamine receptor agonist (triptan) is clinically warranted, careful observation of the patient is advised, particularly during treatment initiation and dose increases.

The concomitant use of SNRIs and SSRIs, including serteraline hydrochloride, with serotonin precursors (such as tryptophan) is not recommended.

Treatment with sertraline hydrochloride and any concomitant serotonergic or antidopaminergic agents, including antipsychotics, should be discontinued immediately if the above events occur and supportive symptomatic treatment should be initiated.

Co-administration of sertraline hydrochloride with other drugs which enhance the effects of serotonergic neurotransmission, such as tryptophan, fenfluramine, fentanyl, 5-HT agonists, or the herbal medicine St.

John’s Wort (hypericum perforatum) should be undertaken with caution and avoided whenever possible due to the potential for pharmacodynamic interaction.

DRUG INTERACTIONS

Drug Interactions Potential Effects of Coadministration of Drugs Highly Bound to Plasma Proteins Because sertraline is tightly bound to plasma protein, the administration of sertraline hydrochloride to a patient taking another drug which is tightly bound to protein (e.g., warfarin, digitoxin) may cause a shift in plasma concentrations potentially resulting in an adverse effect.

Conversely, adverse effects may result from displacement of protein bound sertraline hydrochloride by other tightly bound drugs.

In a study comparing prothrombin time AUC (0-120 hr) following dosing with warfarin (0.75 mg/kg) before and after 21 days of dosing with either sertraline hydrochloride (50 to 200 mg/day) or placebo, there was a mean increase in prothrombin time of 8% relative to baseline for sertraline hydrochloride compared to a 1% decrease for placebo (p<0.02).

The normalization of prothrombin time for the sertraline hydrochloride group was delayed compared to the placebo group.

The clinical significance of this change is unknown.

Accordingly, prothrombin time should be carefully monitored when sertraline therapy is initiated or stopped.

Cimetidine In a study assessing disposition of sertraline hydrochloride (100 mg) on the second of 8 days of cimetidine administration (800 mg daily), there were significant increases in sertraline hydrochloride mean AUC (50%), C max (24%) and half-life (26%) compared to the placebo group.

The clinical significance of these changes is unknown.

CNS Active Drugs In a study comparing the disposition of intravenously administered diazepam before and after 21 days of dosing with either sertraline hydrochloride (50 to 200 mg/day escalating dose) or placebo, there was a 32% decrease relative to baseline in diazepam clearance for the sertraline hydrochloride group compared to a 19% decrease relative to baseline for the placebo group (p<0.03).

There was a 23% increase in T max for desmethyldiazepam in the sertraline hydrochloride group compared to a 20% decrease in the placebo group (p<0.03).

The clinical significance of these changes is unknown.

In a placebo-controlled trial in normal volunteers, the administration of two doses of sertraline hydrochloride did not significantly alter steady-state lithium levels or the renal clearance of lithium.

Nonetheless, at this time, it is recommended that plasma lithium levels be monitored following initiation of sertraline hydrochloride therapy with appropriate adjustments to the lithium dose.

In a controlled study of a single dose (2 mg) of pimozide, 200 mg sertraline (q.d.) co-administration to steady state was associated with a mean increase in pimozide AUC and C max of about 40%, but was not associated with any changes in EKG.

Since the highest recommended pimozide dose (10 mg) has not been evaluated in combination with sertraline, the effect on QT interval and PK parameters at doses higher than 2 mg at this time are not known.

While the mechanism of this interaction is unknown, due to the narrow therapeutic index of pimozide and due to the interaction noted at a low dose of pimozide, concomitant administration of sertraline hydrochloride and pimozide should be contraindicated (see CONTRAINDICATIONS ).

Results of a placebo-controlled trial in normal volunteers suggest that chronic administration of sertraline 200 mg/day does not produce clinically important inhibition of phenytoin metabolism.

Nonethless, at this time, it is recommended that plasma phenytoin concentrations be monitored following initiation of Sertraline Hydrochloride therapy with appropriate adjustments to the phenytoin dose, practiculary in patients with multiple underlying medical conditions and/or those receiving multiple concomitant medications.

The effect of Sertraline Hydrochloride on valproate levels has not been evaluated in clinical trials.

In the absence of such data, it is recommended that plasma valproate levels be monitored following initiation of sertraline hydrochloride therapy with appropriate adjustments to the valproate dose.

The risk of using sertraline hydrochloride in combination with other CNS active drugs has not been systematically evaluated.

Consequently, caution is advised if the concomitant administration of sertraline hydrochloride and such drugs is required.

There is limited controlled experience regarding the optimal timing of switching from other drugs effective in the treatment of major depressive disorder to sertraline hydrochloride.

Care and prudent medical judgment should be exercised when switching, particularly from long-acting agents.

The duration of an appropriate washout period which should intervene before switching from one selective serotonin reuptake inhibitor (SSRI) to another has not been established.

Monoamine Oxidase Inhibitors See CONTRAINDICATIONS and WARNINGS .

Drugs Metabolized by P450 3A4 In three separate in vivo interaction studies, sertraline was co-administered with cytochrome P450 3A4 substrates, terfenadine, carbamazepine, or cisapride under steady-state conditions.

The results of these studies indicated that sertraline did not increase plasma concentrations of terfenadine, carbamazepine, or cisapride.

These data indicate that sertraline’s extent of inhibition of P450 3A4 activity is not likely to be of clinical significance.

Results of the interaction study with cisapride indicate that sertraline 200 mg (q.d.) induces the metabolism of cisapride (cisapride AUC and C max were reduced by about 35%).

Drugs Metabolized by P450 2D6 Many drugs effective in the treatment of major depressive disorder, e.g., the SSRIs, including sertraline, and most tricyclic antidepressant drugs effective in the treatment of major depressive disorder inhibit the biochemical activity of the drug metabolizing isozyme cytochrome P450 2D6 (debrisoquin hydroxylase), and, thus, may increase the plasma concentrations of co-administered drugs that are metabolized by P450 2D6.

The drugs for which this potential interaction is of greatest concern are those metabolized primarily by 2D6 and which have a narrow therapeutic index, e.g., the tricyclic antidepressant drugs effective in the treatment of major depressive disorder and the Type 1C antiarrhythmics propafenone and flecainide.

The extent to which this interaction is an important clinical problem depends on the extent of the inhibition of P450 2D6 by the antidepressant and the therapeutic index of the co-administered drug.

There is variability among the drugs effective in the treatment of major depressive disorder in the extent of clinically important 2D6 inhibition, and in fact sertraline at lower doses has a less prominent inhibitory effect on 2D6 than some others in the class.

Nevertheless, even sertraline has the potential for clinically important 2D6 inhibition.

Consequently, concomitant use of a drug metabolized by P450 2D6 with sertraline hydrochloride may require lower doses than usually prescribed for the other drug.

Furthermore, whenever sertraline hydrochloride is withdrawn from co-therapy, an increased dose of the co-administered drug may be required (see Tricyclic Antidepressant Drugs Effective in the Treatment of Major Depressive Disorder under PRECAUTIONS ).

Serotonergic Drugs Based on the mechanism of action of SNRIs and SSRIs, including sertraline hydrochloride, and the potential for serotonin syndrome, caution is advised when SNRIs and SSRIs, including sertraline hydrochloride, are coadministered with other drugs that may affect the serotonergic neutrotransmitter systems, such as triptans, linezolid (an antibiotic which is a reversible non-selective MAOI), lithium, tramadol, or St.

John’s Wort (see WARNINGS-Serotonin Syndrome ).

The concomitant use of sertraline hydrochloride with other SSRIs, SNRIs or tryptophan is not recommended (see PRECAUTIONS – Drug Interactions ).

Triptans There have been rare post-marketing reports of serotonin syndrome with use of an SNRI or an SSRI and a triptan.

If concomitant treatment of SNRIs and SSRIs, including sertraline hydrochloride, with a triptan is clinically warranted, careful observation of the patient is advised, particularly during treatment initiation and dose increases (see WARNINGS – Serotonin Syndrome ).

Sumatriptan There have been rare post marketing reports describing patients with weakness, hyperreflexia, and incoordination following the use of a selective serotonin reuptake inhibitor (SSRI) and sumatriptan.

If concomitant treatment with sumatriptan and an SSRI (e.g., citalopram, fluoxetine, fluvoxamine, paroxetine, sertraline) is clinically warranted, appropriate observation of the patient is advised.

Tricyclic Antidepressant Drugs Effective in the Treatment of Major Depressive Disorder (TCAs) The extent to which SSRI–TCA interactions may pose clinical problems will depend on the degree of inhibition and the pharmacokinetics of the SSRI involved.

Nevertheless, caution is indicated in the co-administration of TCAs with sertraline hydrochloride, because sertraline may inhibit TCA metabolism.

Plasma TCA concentrations may need to be monitored, and the dose of TCA may need to be reduced, if a TCA is co-administered with sertraline (see Drugs Metabolized by P450 2D6 under PRECAUTIONS ).

Hypoglycemic Drugs In a placebo-controlled trial in normal volunteers; administration of sertraline hydrochloride for 22 days (including 200 mg/day for the final 13 days) caused a statistically significant 16% decrease from baseline in the clearance of tolbutamide following an intravenous 1000 mg dose.

Sertraline hydrochloride administration did not noticeably change either the plasma protein binding or the apparent volume of distribution of tolbutamide, suggesting that the decreased clearance was due to a change in the metabolism of the drug.

The clinical significance of this decrease in tolbutamide clearance is unknown.

Atenolol Sertraline hydrochloride (100 mg) when administered to 10 healthy male subjects had no effect on the beta-adrenergic blocking ability of atenolol.

Digoxin In a placebo-controlled trial in normal volunteers, administration of sertraline hydrochloride for 17 days (including 200 mg/day for the last 10 days) did not change serum digoxin levels or digoxin renal clearance.

Microsomal Enzyme Induction Preclinical studies have shown sertraline hydrochloride to induce hepatic microsomal enzymes.

In clinical studies, sertraline hydrochloride was shown to induce hepatic enzymes minimally as determined by a small (5%) but statistically significant decrease in antipyrine half-life following administration of 200 mg/day for 21 days.

This small change in antipyrine half-life reflects a clinically insignificant change in hepatic metabolism.

Drugs That Interfere With Hemostasis (Non-selective NSAIDs, Aspirin, Warfarin, etc.) Serotonin release by platelets plays an important role in hemostasis.

Epidemiological studies of the case-control and cohort design that have demonstrated an association between the use of psychotropic drugs that interfere with serotonin reuptake and the occurrence of upper gastrointestinal bleeding have also shown that concurrent use of an NSAID, or aspirin potentiated the risk of bleeding.

These studies have also shown that concurrent use of an NSAID or aspirin may potentiate this risk of bleeding.

Altered anticoagulant effects, including increased bleeding, have been reported when SSRIs or SNRIs are coadministered with warfarin.

Patients receiving warfarin therapy should be carefully monitored when sertraline hydrochloride is initiated or discontinued.

Electroconvulsive Therapy There are no clinical studies establishing the risks or benefits of the combined use of electroconvulsive therapy (ECT) and sertraline hydrochloride.

Alcohol Although sertraline hydrochloride did not potentiate the cognitive and psychomotor effects of alcohol in experiments with normal subjects, the concomitant use of sertraline hydrochloride and alcohol is not recommended.

OVERDOSAGE

Human Experience Of 1,027 cases of overdose involving sertraline hydrochloride worldwide, alone or with other drugs, there were 72 deaths (circa 1999).

Among 634 overdoses in which sertraline hydrochloride was the only drug ingested, 8 resulted in fatal outcome, 75 completely recovered, and 27 patients experienced sequelae after overdosage to include alopecia, decreased libido, diarrhea, ejaculation disorder, fatigue, insomnia, somnolence and serotonin syndrome.

The remaining 524 cases had an unknown outcome.

The most common signs and symptoms associated with non-fatal sertraline hydrochloride overdosage were somnolence, vomiting, tachycardia, nausea, dizziness, agitation and tremor.

The largest known ingestion was 13.5 grams in a patient who took sertraline hydrochloride alone and subsequently recovered.

However, another patient who took 2.5 grams of sertraline hydrochloride alone experienced a fatal outcome.

Other important adverse events reported with sertraline hydrochloride overdose (single or multiple drugs) include bradycardia, bundle branch block, coma, convulsions, delirium, hallucinations, hypertension, hypotension, manic reaction, pancreatitis, QT-interval prolongation, serotonin syndrome, stupor and syncope.

Overdose Management Treatment should consist of those general measures employed in the management of overdosage with any antidepressant.

Ensure an adequate airway, oxygenation and ventilation.

Monitor cardiac rhythm and vital signs.

General supportive and symptomatic measures are also recommended.

Induction of emesis is not recommended.

Gastric lavage with a large-bore orogastric tube with appropriate airway protection, if needed, may be indicated if performed soon after ingestion, or in symptomatic patients.

Activated charcoal should be administered.

Due to large volume of distribution of this drug, forced diuresis, dialysis, hemoperfusion and exchange transfusion are unlikely to be of benefit.

No specific antidotes for sertraline are known.

In managing overdosage, consider the possibility of multiple drug involvement.

The physician should consider contacting a poison control center on the treatment of any overdose.

Telephone numbers for certified poison control centers are listed in the Physicians’ Desk Reference (PDR).

DESCRIPTION

Sertraline hydrochloride is a selective serotonin reuptake inhibitor (SSRI) for oral administration.

It has a molecular weight of 342.7.

Sertraline hydrochloride has the following chemical name: (1S-cis)-4-(3,4-dichlorophenyl)-1,2,3,4-tetrahydro-N-methyl-1-naphthalenamine hydrochloride.

The empirical formula C 17 H 17 NC l2 ∙HCl is represented by the following structural formula: Sertraline hydrochloride is a white crystalline powder that is slightly soluble in water and isopropyl alcohol, and sparingly soluble in ethanol.

Sertraline is supplied for oral administration as scored tablets containing sertraline hydrochloride equivalent to 25, 50 and 100 mg of sertraline and the following inactive ingredients: D & C Yellow #10 aluminum lake (in 25 mg tablet), FD & C Blue #2 aluminum lake (in 25 mg & 50 mg tablets), magnesium stearate, microcrystalline cellulose, polyethylene glycolS, polyvinyl alcohol, povidone K30, sodium starch glycolate, talc, titanium dioxide & yellow iron oxide.

Chemical Structure

CLINICAL STUDIES

Clinical Trials Major Depressive Disorder The efficacy of sertraline as a treatment for major depressive disorder was established in two placebo-controlled studies in adult outpatients meeting DSM-III criteria for major depressive disorder.

Study 1 was an 8-week study with flexible dosing of sertraline in a range of 50 to 200 mg/day; the mean dose for completers was 145 mg/day.

Study 2 was a 6-week fixed-dose study, including sertraline doses of 50, 100, and 200 mg/day.

Overall, these studies demonstrated sertraline hydrochloride to be superior to placebo on the Hamilton Depression Rating Scale and the Clinical Global Impression Severity and Improvement scales.

Study 2 was not readily interpretable regarding a dose response relationship for effectiveness.

Study 3 involved depressed outpatients who had responded by the end of an initial 8-week open treatment phase on sertraline 50-200 mg/day.

These patients (N=295) were randomized to continuation for 44 weeks on double-blind sertraline hydrochloride 50-200 mg/day or placebo.

A statistically significantly lower relapse rate was observed for patients taking sertraline hydrochloride compared to those on placebo.

The mean dose for completers was 70 mg/day.

Analyses for gender effects on outcome did not suggest any differential responsiveness on the basis of sex.

Premenstrual Dysphoric Disorder (PMDD) The effectiveness of sertraline for the treatment of PMDD was established in two double-blind, parallel group, placebo-controlled flexible dose trials (Studies 1 and 2) conducted over 3 menstrual cycles.

Patients in Study 1 met DSM-III-R criteria for Late Luteal Phase Dysphoric Disorder (LLPDD), the clinical entity now referred to as Premenstrual Dysphoric Disorder (PMDD) in DSM-IV.

Patients in Study 2 met DSM-IV criteria for PMDD.

Study 1 utilized daily dosing throughout the study, while Study 2 utilized luteal phase dosing for the 2 weeks prior to the onset of menses.

The mean duration of PMDD symptoms for these patients was approximately 10.5 years in both studies.

Patients on oral contraceptives were excluded from these trials; therefore, the efficacy of sertraline in combination with oral contraceptives for the treatment of PMDD is unknown.

Efficacy was assessed with the Daily Record of Severity of Problems (DRSP), a patient-rated instrument that mirrors the diagnostic criteria for PMDD as identified in the DSM-IV, and includes assessments for mood, physical symptoms, and other symptoms.

Other efficacy assessments included the Hamilton Depression Rating Scale (HAMD-17), and the Clinical Global Impression Severity of Illness (CGI-S) and Improvement (CGI-I) scores.

In Study 1, involving n=251 randomized patients, sertraline hydrochloride treatment was initiated at 50 mg/day and administered daily throughout the menstrual cycle.

In subsequent cycles, patients were dosed in the range of 50-150 mg/day on the basis of clinical response and toleration.

The mean dose for completers was 102 mg/day.

Sertraline hydrochloride administered daily throughout the menstrual cycle was significantly more effective than placebo on change from baseline to endpoint on the DRSP total score, the HAMD-17 total score, and the CGI-S score, as well as the CGI-I score at endpoint.

In Study 2, involving n=281 randomized patients, sertraline hydrochloride treatment was initiated at 50 mg/day in the late luteal phase (last 2 weeks) of each menstrual cycle and then discontinued at the onset of menses.

In subsequent cycles, patients were dosed in the range of 50-100 mg/day in the luteal phase of each cycle, on the basis of clinical response and toleration.

Patients who were titrated to 100 mg/day received 50 mg/day for the first 3 days of the cycle, then 100 mg/day for the remainder of the cycle.

The mean sertraline hydrochloride dose for completers was 74 mg/day.

Sertraline hydrochloride administered in the late luteal phase of the menstrual cycle was significantly more effective than placebo on change from baseline to endpoint on the DRSP total score and the CGI-S score, as well as the CGI-I score at endpoint.

There was insufficient information to determine the effect of race or age on outcome in these studies.

HOW SUPPLIED

Sertraline hydrochloride modified oval biconvex tablets, containing sertraline hydrochloride equivalent to 25, 50 and 100 mg of sertraline, are packaged in bottles.

Sertraline hydrochloride 25 mg Tablets: Light Green film coated, Modified oval biconvex tablets debossed with 5 on the left side of bisect and 8 on the right side of bisect on one side and “W” on other.

NDC 51138-585-30 Bottles of 30 Sertraline hydrochloride 50 mg Tablets: Light Blue film coated, Modified oval biconvex tablets debossed with 5 on the left side of bisect and 7 on the right side of bisect on one side and “W” on other.

NDC 51138-586-30 Bottles of 30 Sertraline hydrochloride 100 mg Tablets: Light Yellow film coated, Modified oval biconvex tablets debossed with 5 on the left side of bisect and 6 on the right side of bisect on one side and “W” on other.

NDC 51138-587-30 Bottles of 30 New Tablet ID Store at 20ºC to 25ºC (68ºF to 77ºF) [See USP Controlled Room Temperature].

Dispense in a tight, light-resistant container as defined in the USP using a child-resistant closure.

GERIATRIC USE

Geriatric Use U.S.

geriatric clinical studies of sertraline hydrochloride in major depressive disorder included 663 sertraline hydrochloride-treated subjects ≥ 65 years of age, of those, 180 were ≥ 75 years of age.

No overall differences in the pattern of adverse reactions were observed in the geriatric clinical trial subjects relative to those reported in younger subjects (see ADVERSE REACTIONS ), and other reported experience has not identified differences in safety patterns between the elderly and younger subjects.

As with all medications, greater sensitivity of some older individuals cannot be ruled out.

There were 947 subjects in placebo-controlled geriatric clinical studies of sertraline hydrochloride in major depressive disorder.

No overall differences in the pattern of efficacy were observed in the geriatric clinical trial subjects relative to those reported in younger subjects.

Other Adverse Events in Geriatric Patients In 354 geriatric subjects treated with sertraline hydrochloride in placebo-controlled trials, the overall profile of adverse events was generally similar to that shown in Table 2.

Urinary tract infection was the only adverse event not appearing in Table 2.

SSRIs and SNRIs, including sertraline hydrochloride, have been associated with cases of clinically significant hyponatremia in elderly patients, who may be at greater risk for this adverse event (see PRECAUTIONS, Hyponatremia ).

Diabetes/Loss of Glycemic Control Cases of new onset diabetes mellitus have been reported in patients receiving SSRIs including sertraline hydrochloride.

Loss of glycemic control including both hyperglycemia and hypoglycemia has also been reported in patients with and without preexisting diabetes.

Patients should therefore be monitored for signs and symptoms of glucose fluctuations.

Diabetic patients especially should have their glycemic control carefully monitored since their dosage of insulin and/or concomitant oral hypoglycemic drug may need to be adjusted.

INDICATIONS AND USAGE

Major Depressive Disorder Sertraline is indicated for the treatment of major depressive disorder in adults.

The efficacy of sertraline hydrochloride in the treatment of a major depressive episode was established in six to eight week controlled trials of adult outpatients whose diagnoses corresponded most closely to the DSM-III category of major depressive disorder (see Clinical Trials under CLINICAL PHARMACOLOGY ).

A major depressive episode implies a prominent and relatively persistent depressed or dysphoric mood that usually interferes with daily functioning (nearly every day for at least 2 weeks); it should include at least 4 of the following 8 symptoms: change in appetite, change in sleep, psychomotor agitation or retardation, loss of interest in usual activities or decrease in sexual drive, increased fatigue, feelings of guilt or worthlessness, slowed thinking or impaired concentration, and a suicide attempt or suicidal ideation.

The antidepressant action of sertraline hydrochloride in hospitalized depressed patients has not been adequately studied.

The efficacy of sertraline hydrochloride in maintaining an antidepressant response for up to 44 weeks following 8 weeks of open-label acute treatment (52 weeks total) was demonstrated in a placebo-controlled trial.

The usefulness of the drug in patients receiving sertraline hydrochloride for extended periods should be reevaluated periodically (see Clinical Trials under CLINICAL PHARMACOLOGY ).

Premenstrual Dysphoric Disorder (PMDD) Sertraline hydrochloride is indicated for the treatment of premenstrual dysphoric disorder (PMDD) in adults.

The efficacy of sertraline hydrochloride in the treatment of PMDD was established in 2 placebo-controlled trials of female adult outpatients treated for 3 menstrual cycles who met criteria for the DSM-III­-R/IV category of PMDD (see Clinical Trials under CLINICAL PHARMACOLOGY ).

The essential features of PMDD include markedly depressed mood, anxiety or tension, affective lability, and persistent anger or irritability.

Other features include decreased interest in activities, difficulty concentrating, lack of energy, change in appetite or sleep, and feeling out of control.

Physical symptoms associated with PMDD include breast tenderness, headache, joint and muscle pain, bloating and weight gain.

These symptoms occur regularly during the luteal phase and remit within a few days following onset of menses; the disturbance markedly interferes with work or school or with usual social activities and relationships with others.

In making the diagnosis, care should be taken to rule out other cyclical mood disorders that may be exacerbated by treatment with an antidepressant.

The effectiveness of sertraline hydrochloride in long-term use, that is, for more than 3 menstrual cycles, has not been systematically evaluated in controlled trials.

Therefore, the physician who elects to use sertraline hydrochloride for extended periods should periodically re-evaluate the long-term usefulness of the drug for the individual patient (see DOSAGE AND ADMINISTRATION ).

PEDIATRIC USE

Pediatric Use Safety and effectiveness in pediatric patients with major depressive disorder have not been established (see BOX WARNING and WARNINGS , Clinical Worsening and Suicide Risk ).

Two placebo controlled trials (n=373) in pediatric patients with MDD have been conducted with sertraline hydrochloride, and the data were not sufficient to support a claim for use in pediatric patients.

Anyone considering the use of sertraline hydrochloride tablets in a child or adolescent must balance the potential risks with the clinical need.

Sertraline pharmacokinetics were evaluated in a group of 61 pediatric patients between 6 and 17 years of age and revealed similar drug exposures to those of adults when plasma concentration was adjusted for weight (see Pharmacokinetics under CLINICAL PHARMACOLOGY ).

Approximately 600 pediatric patients between 6 and 17 years of age have received sertraline in clinical trials, both controlled and uncontrolled.

The adverse event profile observed in these patients was generally similar to that observed in adult studies with sertraline hydrochloride (see ADVERSE REACTIONS ).

As with other SSRIs, decreased appetite and weight loss have been observed in association with the use of sertraline hydrochloride.

In a pooled analysis of two 10­-week, double-blind, placebo-controlled, flexible dose (50-200 mg) outpatient trials for major depressive disorder (n=373), there was a difference in weight change between sertraline and placebo of roughly 1 kilogram, for both children (ages 6-11) and adolescents (ages 12-17), in both cases representing a slight weight loss for sertraline compared to a slight gain for placebo.

At baseline the mean weight for children was 39.0 kg for sertraline and 38.5 kg for placebo.

At baseline the mean weight for adolescents was 61.4 kg for sertraline and 62.5 kg for placebo.

There was a bigger difference between sertraline and placebo in the proportion of outliers for clinically important weight loss in children than in adolescents.

For children, about 7% had a weight loss > 7% of body weight compared to none of the placebo patients; for adolescents, about 2% had a weight loss > 7% of body weight compared to about 1% of the placebo patients.

A subset of these patients who completed the randomized controlled trials (sertraline n=99, placebo n=122) were continued into a 24-week, flexible-dose, open-label, extension study.

A mean weight loss of approximately 0.5 kg was seen during the first eight weeks of treatment for subjects with first exposure to sertraline during the open-label extension study, similar to the mean weight loss observed among sertraline treated subjects during the first eight weeks of the randomized controlled trials.

The subjects continuing in the open label study began gaining weight compared to baseline by week 12 of sertraline treatment.

Those subjects who completed 34 weeks of sertraline treatment (10 weeks in a placebo controlled trial + 24 weeks open label, n=68), had weight gain that was similar to that expected using data from age-adjusted peers.

Regular monitoring of weight and growth is recommended if treatment of a pediatric patient with an SSRI is to be continued long term.

Safety and effectiveness in pediatric patients with major depressive disorder have not been established.

The risks, if any, that may be associated with sertraline hydrochloride’s use beyond 1 year in children and adolescents have not been systematically assessed.

The prescriber should be mindful that the evidence relied upon to conclude that sertraline is safe for use in children and adolescents derives from clinical studies that were 10 to 52 weeks in duration and from the extrapolation of experience gained with adult patients.

In particular, there are no studies that directly evaluate the effects of long-term sertraline use on the growth, development, and maturation of children and adolescents.

Although there is no affirmative finding to suggest that sertraline possesses a capacity to adversely affect growth, development or maturation, the absence of such findings is not compelling evidence of the absence of the potential of sertraline to have adverse effects in chronic use (see WARNINGS – Clinical Worsening and Suicide Risk ).

PREGNANCY

Pregnancy–Pregnancy Category C Reproduction studies have been performed in rats and rabbits at doses up to 80 mg/kg/day and 40 mg/kg/day, respectively.

These doses correspond to approximately 4 times the maximum recommended human dose (MRHD) on a mg/m 2 basis.

There was no evidence of teratogenicity at any dose level.

When pregnant rats and rabbits were given sertraline during the period of organogenesis, delayed ossification was observed in fetuses at doses of 10 mg/kg (0.5 times the MRHD on a mg/m 2 basis) in rats and 40 mg/kg (4 times the MRHD on a mg/m 2 basis) in rabbits.

When female rats received sertraline during the last third of gestation and throughout lactation, there was an increase in the number of stillborn pups and in the number of pups dying during the first 4 days after birth.

Pup body weights were also decreased during the first four days after birth.

These effects occurred at a dose of 20 mg/kg (1 times the MRHD on a mg/m 2 basis).

The no effect dose for rat pup mortality was 10 mg/kg (0.5 times the MRHD on a mg/m 2 basis).

The decrease in pup survival was shown to be due to in utero exposure to sertraline.

The clinical significance of these effects is unknown.

There are no adequate and well-controlled studies in pregnant women.

Sertraline hydrochloride should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

NUSRING MOTHERS

Nursing Mothers It is not known whether, and if so in what amount, sertraline or its metabolites are excreted in human milk.

Because many drugs are excreted in human milk, caution should be exercised when sertraline hydrochloride is administered to a nursing woman.

BOXED WARNING

Suicidality and Antidepressant Drugs Antidepressants increased the risk compared to placebo of suicidal thinking and behavior (suicidality) in children, adolescents, and young adults in short-term studies of major depressive disorder (MDD) and other psychiatric disorders.

Anyone considering the use of sertraline hydrochloride or any other antidepressant in a child, adolescent, or young adult must balance this risk with the clinical need.

Short-term studies did not show an increase in the risk of suicidality with antidepressants compared to placebo in adults beyond age 24; there was a reduction in risk with antidepressants compared to placebo in adults aged 65 and older.

Depression and certain other psychiatric disorders are themselves associated with increases in the risk of suicide.

Patients of all ages who are started on antidepressant therapy should be monitored appropriately and observed closely for clinical worsening, suicidality, or unusual changes in behavior.

Families and caregivers should be advised of the need for close observation and communication with the prescriber.

Sertraline hydrochloride is not approved for use in pediatric patients except for patients with obsessive compulsive disorder (OCD).

(See Warnings: Clinical Worsening and Suicide Risk , Precautions: Information for Patients , and Precautions: Pediatric Use )

INFORMATION FOR PATIENTS

Information for Patients Prescribers or other health professionals should inform patients, their families, and their caregivers about the benefits and risks associated with treatment with sertraline hydrochloride and should counsel them in its appropriate use.

A patient Medication Guide about ‘Antidepressant Medicines, Depression and other Serious Mental Illness, and Suicidal Thoughts or Actions’ is available for sertraline hydrochloride.

The prescriber or health professional should instruct patients, their families, and their caregivers to read the Medication Guide and should assist them in understanding its contents.

Patients should be given the opportunity to discuss the contents of the Medication Guide and to obtain answers to any questions they may have.

The complete text of the Medication Guide is reprinted at the end of this document.

Patients should be advised of the following issues and asked to alert their prescriber if these occur while taking sertraline hydrochloride.

Clinical Worsening and Suicide Risk Patients, their families, and their caregivers should be encouraged to be alert to the emergence of anxiety, agitation, panic attacks, insomnia, irritability, hostility, aggressiveness, impulsivity, akathisia (psychomotor restlessness), hypomania, mania, other unusual changes in behavior, worsening of depression, and suicidal ideation, especially early during antidepressant treatment and when the dose is adjusted up or down.

Families and caregivers of patients should be advised to look for the emergence of such symptoms on a day-to-day basis, since changes may be abrupt.

Such symptoms should be reported to the patient’s prescriber or health professional, especially if they are severe, abrupt in onset, or were not part of the patient’s presenting symptoms.

Symptoms such as these may be associated with an increased risk for suicidal thinking and behavior and indicate a need for very close monitoring and possibly changes in the medication.

Patients should be cautioned about the risk of serotonin syndrome with the concomitant use of SNRIs and SSRIs, including sertraline hydrochloride, and triptans, tramadol, or other serotonergic agents.

Patients should be told that although sertraline hydrochloride has not been shown to impair the ability of normal subjects to perform tasks requiring complex motor and mental skills in laboratory experiments, drugs that act upon the central nervous system may affect some individuals adversely.

Therefore, patients should be told that until they learn how they respond to sertraline hydrochloride they should be careful doing activities when they need to be alert, such as driving a car or operating machinery.

Patients should be cautioned about the concomitant use of sertraline hydrochloride and non-selective NSAIDs (i.e., NSAIDs that inhibit both cycloxygenase isoenzymes COX1 and 2), aspirin, or other drugs that affect coagulation since the combined use of psychotropic drugs that interfere with serotonin reuptake and these agents has been associated with an increased risk of bleeding.

Patients should be told that although sertraline hydrochloride has not been shown in experiments with normal subjects to increase the mental and motor skill impairments caused by alcohol, the concomitant use of sertraline hydrochloride and alcohol is not advised.

Patients should be told that while no adverse interaction of sertraline hydrochloride with over-the-counter (OTC) drug products is known to occur, the potential for interaction exists.

Thus, the use of any OTC product should be initiated cautiously according to the directions of use given for the OTC product.

Patients should be advised to notify their physician if they become pregnant or intend to become pregnant during therapy.

Patients should be advised to notify their physician if they are breast feeding an infant.

DOSAGE AND ADMINISTRATION

Initial Treatment Dosage for Adults Major Depressive Disorder Sertraline hydrochloride treatment should be administered at a dose of 50 mg once daily.

While a relationship between dose and effect has not been established for major depressive disorder, patients were dosed in a range of 50-200 mg/day in the clinical trials demonstrating the effectiveness of sertraline hydrochloride for the treatment of this indication.

Consequently, a dose of 50 mg, administered once daily, is recommended as the initial therapeutic dose.

Patients not responding to a 50 mg dose may benefit from dose increases up to a maximum of 200 mg/day.

Given the 24 hour elimination half-life of sertraline hydrochloride, dose changes should not occur at intervals of less than 1 week.

Premenstrual Dysphoric Disorder Sertraline hydrochloride treatment should be initiated with a dose of 50 mg/day, either daily throughout the menstrual cycle or limited to the luteal phase of the menstrual cycle, depending on physician assessment.

While a relationship between dose and effect has not been established for PMDD, patients were dosed in the range of 50-150 mg/day with dose increases at the onset of each new menstrual cycle (see Clinical Trials under CLINICAL PHARMACOLOGY ).

Patients not responding to a 50 mg/day dose may benefit from dose increases (at 50 mg increments/menstrual cycle) up to 150 mg/day when dosing daily throughout the menstrual cycle, or 100 mg/day when dosing during the luteal phase of the menstrual cycle.

If a 100 mg/day dose has been established with luteal phase dosing, a 50 mg/day titration step for three days should be utilized at the beginning of each luteal phase dosing period.

Sertraline hydrochloride should be administered once daily, either in the morning or evening.

Maintenance/Continuation/Extended Treatment Major Depressive Disorder It is generally agreed that acute episodes of major depressive disorder require several months or longer of sustained pharmacologic therapy beyond response to the acute episode.

Systematic evaluation of sertraline hydrochloride has demonstrated that its antidepressant efficacy is maintained for periods of up to 44 weeks following 8 weeks of initial treatment at a dose of 50-200 mg/day (mean dose of 70 mg/day) (see Clinical Trials under CLINICAL PHARMACOLOGY ).

It is not known whether the dose of sertraline hydrochloride needed for maintenance treatment is identical to the dose needed to achieve an initial response.

Patients should be periodically reassessed to determine the need for maintenance treatment.

Premenstrual Dysphoric Disorder The effectiveness of sertraline hydrochloride in long-term use, that is, for more than 3 menstrual cycles, has not been systematically evaluated in controlled trials.

However, as women commonly report that symptoms worsen with age until relieved by the onset of menopause, it is reasonable to consider continuation of a responding patient.

Dosage adjustments, which may include changes between dosage regimens (e.g., daily throughout the menstrual cycle versus during the luteal phase of the menstrual cycle), may be needed to maintain the patient on the lowest effective dosage and patients should be periodically reassessed to determine the need for continued treatment.

Switching Patients to or from a Monoamine Oxidase Inhibitor At least 14 days should elapse between discontinuation of an MAOI and initiation of therapy with sertraline hydrochloride.

In addition, at least 14 days should be allowed after stopping sertraline hydrochloride before starting an MAOI (see CONTRAINDICATIONS and WARNINGS ).

Special Populations Dosage for Hepatically Impaired Patients The use of sertraline in patients with liver disease should be approached with caution.

The effects of sertraline in patients with moderate and severe hepatic impairment have not been studied.

If sertraline is administered to patients with liver impairment, a lower or less frequent dose should be used (see CLINICAL PHARMACOLOGY and PRECAUTIONS ).

Treatment of Pregnant Women During the Third Trimester Neonates exposed to sertraline hydrochloride and other SSRIs or SNRIs, late in the third trimester have developed complications requiring prolonged hospitalization, respiratory support, and tube feeding (see PRECAUTIONS ).

When treating pregnant women with sertraline hydrochloride during the third trimester, the physician should carefully consider the potential risks and benefits of treatment.

The physician may consider tapering sertraline hydrochloride in the third trimester.

Discontinuation of Treatment with Sertraline Symptoms associated with discontinuation of sertraline hydrochloride and other SSRIs and SNRIs, have been reported (see PRECAUTIONS ).

Patients should be monitored for these symptoms when discontinuing treatment.

A gradual reduction in the dose rather than abrupt cessation is recommended whenever possible.

If intolerable symptoms occur following a decrease in the dose or upon discontinuation of treatment, then resuming the previously prescribed dose may be considered.

Subsequently, the physician may continue decreasing the dose but at a more gradual rate.

Azithromycin 500 MG Oral Tablet [Zithromax]

DRUG INTERACTIONS

7 Nelfinavir: Close monitoring for known adverse reactions of azithromycin, such as liver enzyme abnormalities and hearing impairment, is warranted.

( 7.1 ) Warfarin: Use with azithromycin may increase coagulation times; monitor prothrombin time.

( 7.2 ) 7.1 Nelfinavir Co-administration of nelfinavir at steady-state with a single oral dose of azithromycin resulted in increased azithromycin serum concentrations.

Although a dose adjustment of azithromycin is not recommended when administered in combination with nelfinavir, close monitoring for known adverse reactions of azithromycin, such as liver enzyme abnormalities and hearing impairment, is warranted.

[see Adverse Reactions (6) ] 7.2 Warfarin Spontaneous postmarketing reports suggest that concomitant administration of azithromycin may potentiate the effects of oral anticoagulants such as warfarin, although the prothrombin time was not affected in the dedicated drug interaction study with azithromycin and warfarin.

Prothrombin times should be carefully monitored while patients are receiving azithromycin and oral anticoagulants concomitantly.

7.

3 Potential Drug-Drug Interactions with Macrolides Interactions with digoxin or phenytoin have not been reported in clinical trials with azithromycin; however, no specific drug interaction studies have been performed to evaluate potential drug-drug interactions.

However, drug interactions have been observed with other macrolide products.

Until further data are developed regarding drug interactions when digoxin or phenytoin are used concomitantly with azithromycin careful monitoring of patients is advised.

OVERDOSAGE

10 Adverse reactions experienced at higher than recommended doses were similar to those seen at normal doses particularly nausea, diarrhea, and vomiting.

In the event of overdosage, general symptomatic and supportive measures are indicated as required.

DESCRIPTION

11 ZITHROMAX (azithromycin tablets and azithromycin for oral suspension) contain the active ingredient azithromycin, a macrolide antibacterial drug, for oral administration.

Azithromycin has the chemical name (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)-13-[(2,6-dideoxy-3-C-methyl-3-O-methyl-α-L-ribo-hexopyranosyl) oxy]-2-ethyl-3,4,10-trihydroxy-3,5,6,8,10,12,14-heptamethyl-11-[[3,4,6-trideoxy-3-(dimethylamino)-β-D-xylo-hexopyranosyl]oxy]-1-oxa-6-azacyclopentadecan-15-one.

Azithromycin is derived from erythromycin; however, it differs chemically from erythromycin in that a methyl-substituted nitrogen atom is incorporated into the lactone ring.

Its molecular formula is C38H72N2O12, and its molecular weight is 749.00.

Azithromycin has the following structural formula: Azithromycin, as the dihydrate, is a white crystalline powder with a molecular formula of C38H72N2O12∙2H2O and a molecular weight of 785.0.

ZITHROMAX is supplied as tablets containing azithromycin dihydrate equivalent to either 250 mg or 500 mg azithromycin and the following inactive ingredients: dibasic calcium phosphate anhydrous, pregelatinized starch, sodium croscarmellose, magnesium stearate, sodium lauryl sulfate, hypromellose, lactose, titanium dioxide, triacetin, and D&C Red #30 aluminum lake.

ZITHROMAX for oral suspension is supplied in bottles containing azithromycin dihydrate powder equivalent to 300 mg, 600 mg, 900 mg, or 1200 mg azithromycin per bottle and the following inactive ingredients: sucrose; sodium phosphate, tribasic, anhydrous; hydroxypropyl cellulose; xanthan gum; FD&C Red #40; and spray dried artificial cherry, creme de vanilla, and banana flavors.

After constitution, each 5 mL of suspension contains 100 mg or 200 mg of azithromycin.

Chemical Structure

CLINICAL STUDIES

14 14.1 Adult Patients Acute Bacterial Exacerbations of Chronic Bronchitis In a randomized, double-blind controlled clinical trial of acute exacerbation of chronic bronchitis (AECB), azithromycin (500 mg once daily for 3 days) was compared with clarithromycin (500 mg twice daily for 10 days).

The primary endpoint of this trial was the clinical cure rate at Days 21– 24.

For the 304 patients analyzed in the modified intent-to-treat analysis at the Days 21–24 visit, the clinical cure rate for 3 days of azithromycin was 85% (125/147) compared to 82% (129/157) for 10 days of clarithromycin.

The following outcomes were the clinical cure rates at the Days 21–24 visit for the bacteriologically evaluable patients by pathogen: Pathogen Azithromycin (3 Days) Clarithromycin (10 Days) S.

pneumoniae 29/32 (91%) 21/27 (78%) H.

influenzae 12/14 (86%) 14/16 (88%) M.

catarrhalis 11/12 (92%) 12/15 (80%) Acute Bacterial Sinusitis In a randomized, double-blind, double-dummy controlled clinical trial of acute bacterial sinusitis, azithromycin (500 mg once daily for 3 days) was compared with amoxicillin/clavulanate (500/125 mg three times a day for 10 days).

Clinical response assessments were made at Day 10 and Day 28.

The primary endpoint of this trial was prospectively defined as the clinical cure rate at Day 28.

For the 594 patients analyzed in the modified intent to treat analysis at the Day 10 visit, the clinical cure rate for 3 days of azithromycin was 88% (268/303) compared to 85% (248/291) for 10 days of amoxicillin/clavulanate.

For the 586 patients analyzed in the modified intent to treat analysis at the Day 28 visit, the clinical cure rate for 3 days of azithromycin was 71.5% (213/298) compared to 71.5% (206/288), with a 97.5% confidence interval of –8.4 to 8.3, for 10 days of amoxicillin/clavulanate.

In an open label, non-comparative study requiring baseline transantral sinus punctures, the following outcomes were the clinical success rates at the Day 7 and Day 28 visits for the modified intent to treat patients administered 500 mg of azithromycin once daily for 3 days with the following pathogens: Clinical Success Rates of Azithromycin (500 mg per day for 3 Days) Pathogen Day 7 Day28 S.

pneumoniae 23/26 (88%) 21/25 (84%) H.

influenzae 28/32 (87%) 24/32 (75%) M.

catarrhalis 14/15 (93%) 13/15 (87%) 14.2 Pediatric Patients From the perspective of evaluating pediatric clinical trials, Days 11–14 were considered on-therapy evaluations because of the extended half-life of azithromycin.

Days 11–14 data are provided for clinical guidance.

Days 24–32 evaluations were considered the primary test of cure endpoint.

Pharyngitis/Tonsillitis In three double-blind controlled studies, conducted in the United States, azithromycin (12 mg/kg once a day for 5 days) was compared to penicillin V (250 mg three times a day for 10 days) in the treatment of pharyngitis due to documented Group A β-hemolytic streptococci (GABHS or S.

pyogenes ).

Azithromycin was clinically and microbiologically statistically superior to penicillin at Day 14 and Day 30 with the following clinical success (i.e., cure and improvement) and bacteriologic efficacy rates (for the combined evaluable patient with documented GABHS): Three U.S.

Streptococcal Pharyngitis Studies Azithromycin vs.

Penicillin V EFFICACY RESULTS Day 14 Day 30 Bacteriologic Eradication: Azithromycin 323/340 (95%) 255/330 (77%) Penicillin V 242/332 (73%) 206/325 (63%) Clinical Success (cure plus improvement): Azithromycin 336/343 (98%) 310/330 (94%) Penicillin V 284/338 (84%) 241/325 (74%) Approximately 1% of azithromycin-susceptible S.

pyogenes isolates were resistant to azithromycin following therapy.

Acute Otitis Media Efficacy using azithromycin given over 5 days (10 mg/kg on Day 1 followed by 5 mg/kg on Days 2–5).

Trial 1 In a double-blind, controlled clinical study of acute otitis media performed in the United States, azithromycin (10 mg/kg on Day 1 followed by 5 mg/kg on Days 2–5) was compared to amoxicillin/clavulanate potassium (4:1).

For the 553 patients who were evaluated for clinical efficacy, the clinical success rate (i.e., cure plus improvement) at the Day 11 visit was 88% for azithromycin and 88% for the control agent.

For the 521 patients who were evaluated at the Day 30 visit, the clinical success rate was 73% for azithromycin and 71% for the control agent.

Trial 2 In a non-comparative clinical and microbiologic trial performed in the United States, where significant rates of beta-lactamase producing organisms (35%) were found, 131 patients were evaluable for clinical efficacy.

The combined clinical success rate (i.e., cure and improvement) at the Day 11 visit was 84% for azithromycin.

For the 122 patients who were evaluated at the Day 30 visit, the clinical success rate was 70% for azithromycin.

Microbiologic determinations were made at the pre-treatment visit.

Microbiology was not reassessed at later visits.

The following clinical success rates were obtained from the evaluable group: Pathogen Day 11 Day 30 Azithromycin Azithromycin S.

pneumoniae 61/74 (82%) 40/56 (71%) H.

influenzae 43/54 (80%) 30/47 (64%) M.

catarrhalis 28/35 (80%) 19/26 (73%) S.

pyogenes 11/11 (100%) 7/7 (100%) Overall 177/217 (82%) 97/137 (73%) Trial 3 In another controlled comparative clinical and microbiologic study of otitis media performed in the United States, azithromycin (10 mg/kg on Day 1 followed by 5 mg/kg on Days 2–5).was compared to amoxicillin/clavulanate potassium (4:1).

This study utilized two of the same investigators as Protocol 2 (above), and these two investigators enrolled 90% of the patients in Protocol 3.

For this reason, Protocol 3 was not considered to be an independent study.

Significant rates of beta-lactamase producing organisms (20%) were found.

Ninety-two (92) patients were evaluable for clinical and microbiologic efficacy.

The combined clinical success rate (i.e., cure and improvement) of those patients with a baseline pathogen at the Day 11 visit was 88% for azithromycin vs.

100% for control; at the Day 30 visit, the clinical success rate was 82% for azithromycin vs.

80% for control.

Microbiologic determinations were made at the pre-treatment visit.

Microbiology was not reassessed at later visits.

At the Day 11 and Day 30 visits, the following clinical success rates were obtained from the evaluable group: Day 11 Day 30 Pathogen Azithromycin Control Azithromycin Control S.

pneumoniae 25/29 (86%) 26/26 (100%) 22/28 (79%) 18/22 (82%) H.

influenzae 9/11 (82%) 9/9 (100%) 8/10 (80%) 6/8 (75%) M.

catarrhalis 7/7 (100%) 5/5 (100%) 5/5 (100%) 2/3 (66%) S.

pyogenes 2/2 (100%) 5/5 (100%) 2/2 (100%) 4/4 (100%) Overall 43/49 (88%) 45/45 (100%) 37/45 (82%) 30/37 (81%) Efficacy using azithromycin given over 3 days (10 mg/kg/day).

Trial 4 In a double-blind, controlled, randomized clinical study of acute otitis media in pediatric patients from 6 months to 12 years of age, azithromycin (10 mg/kg per day for 3 days) was compared to amoxicillin/clavulanate potassium (7:1) in divided doses q12h for 10 days.

Each patient received active drug and placebo matched for the comparator.

For the 366 patients who were evaluated for clinical efficacy at the Day 12 visit, the clinical success rate (i.e., cure plus improvement) was 83% for azithromycin and 88% for the control agent.

For the 362 patients who were evaluated at the Days 24–28 visit, the clinical success rate was 74% for azithromycin and 69% for the control agent.

Efficacy using azithromycin 30 mg/kg given as a single dose Trial 5 A double-blind, controlled, randomized trial was performed at nine clinical centers.

Pediatric patients from 6 months to 12 years of age were randomized 1:1 to treatment with either azithromycin (given at 30 mg/kg as a single dose on Day 1) or amoxicillin/clavulanate potassium (7:1), divided q12h for 10 days.

Each child received active drug, and placebo matched for the comparator.

Clinical response (Cure, Improvement, Failure) was evaluated at End of Therapy (Days 12–16) and Test of Cure (Days 28–32).

Safety was evaluated throughout the trial for all treated subjects.

For the 321 subjects who were evaluated at End of Treatment, the clinical success rate (cure plus improvement) was 87% for azithromycin, and 88% for the comparator.

For the 305 subjects who were evaluated at Test of Cure, the clinical success rate was 75% for both azithromycin and the comparator.

Trial 6 In a non-comparative clinical and microbiological trial, 248 patients from 6 months to 12 years of age with documented acute otitis media were dosed with a single oral dose of azithromycin (30 mg/kg on Day 1).

For the 240 patients who were evaluable for clinical modified Intent-to-Treat (MITT) analysis, the clinical success rate (i.e., cure plus improvement) at Day 10 was 89% and for the 242 patients evaluable at Days 24–28, the clinical success rate (cure) was 85%.

Presumed Bacteriologic Eradication Day 10 Days 24–28 S.

pneumoniae 70/76 (92%) 67/76 (88%) H.

influenzae 30/42 (71%) 28/44 (64%) M.

catarrhalis 10/10 (100%) 10/10 (100%) Overall 110/128 (86%) 105/130 (81%)

HOW SUPPLIED

16 /STORAGE AND HANDLING ZITHROMAX is supplied in the following strengths and package configurations: ZITHROMAX 250 mg tablets are supplied as pink modified capsular shaped, engraved, film-coated tablets containing azithromycin dihydrate equivalent to 250 mg of azithromycin.

ZITHROMAX 250 mg tablets are engraved with “PFIZER” on one side and “306” on the other.

These are packaged in bottles and blister cards of 6 tablets (Z-PAKS ® ) as follows: Bottles of 30 NDC 0069-3060-30 Boxes of 3 (Z-PAKS ® of 6) NDC 0069-3060-75 Unit Dose package of 50 NDC 0069-3060-86 ZITHROMAX 500 mg tablets are supplied as pink modified capsular shaped, engraved, film-coated tablets containing azithromycin dihydrate equivalent to 500 mg of azithromycin.

ZITHROMAX 500 mg tablets are engraved with “Pfizer” on one side and “ZTM500” on the other.

These are packaged in bottles and blister cards of 3 tablets (TRI-PAKS™) as follows: Bottles of 30 NDC 0069-3070-30 Boxes of 3 (TRI-PAKS™ of 3 tablets) NDC 0069-3070-75 Unit Dose package of 50 NDC 0069-3070-86 ZITHROMAX tablets should be stored between 15° to 30°C (59° to 86°F).

ZITHROMAX for oral suspension after constitution contains a flavored suspension.

ZITHROMAX for oral suspension is supplied to provide 100 mg/5 mL or 200 mg/5 mL suspension in bottles as follows: Azithromycin contents per bottle NDC 300 mg 0069-3110-19 600 mg 0069-3120-19 900 mg 0069-3130-19 1200 mg 0069-3140-19 [see Dosage and Administration (2) ] for constitution instructions with each bottle type.

Storage: Store dry powder below 30°C (86°F).

Store constituted suspension between 5° to 30°C (41° to 86°F) and discard when full dosing is completed.

RECENT MAJOR CHANGES

Warnings and Precautions, Hypersensitivity ( 5.1 ) 5/2016

GERIATRIC USE

8.5 Geriatric Use In multiple-dose clinical trials of oral azithromycin, 9% of patients were at least 65 years of age (458/4949) and 3% of patients (144/4949) were at least 75 years of age.

No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in response between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.

Elderly patients may be more susceptible to development of torsades de pointes arrhythmias than younger patients.

[see Warnings and Precautions (5.3) ]

DOSAGE FORMS AND STRENGTHS

3 ZITHROMAX 250 mg tablets are supplied as pink modified capsular shaped, engraved, film-coated tablets containing azithromycin dihydrate equivalent to 250 mg of azithromycin.

ZITHROMAX 250 mg tablets are engraved with “PFIZER” on one side and “306” on the other.

These are packaged in bottles and blister cards of 6 tablets (Z-PAKS ® ).

ZITHROMAX 500 mg tablets are supplied as pink modified capsular shaped, engraved, film-coated tablets containing azithromycin dihydrate equivalent to 500 mg of azithromycin.

ZITHROMAX 500 mg tablets are engraved with “Pfizer” on one side and “ZTM500” on the other.

These are packaged in bottles and blister cards of 3 tablets (TRI-PAKS™).

ZITHROMAX for oral suspension after constitution contains a flavored suspension.

ZITHROMAX for oral suspension is supplied to provide 100 mg/5 mL or 200 mg/5 mL suspension in bottles.

ZITHROMAX tablets 250 mg and 500 mg ( 3 ) ZITHROMAX for oral suspension 100 mg/5 mL and 200 mg/5 mL ( 3 )

MECHANISM OF ACTION

12.1 Mechanism of Action Azithromycin is a macrolide antibacterial drug.

[see Microbiology (12.4) ]

INDICATIONS AND USAGE

1 To reduce the development of drug-resistant bacteria and maintain the effectiveness of ZITHROMAX (azithromycin) and other antibacterial drugs, ZITHROMAX (azithromycin) should be used only to treat infections that are proven or strongly suspected to be caused by susceptible bacteria.

When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy.

In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

ZITHROMAX (azithromycin) is a macrolide antibacterial drug indicated for the treatment of patients with mild to moderate infections caused by susceptible strains of the designated microorganisms in the specific conditions listed below.

Recommended dosages and durations of therapy in adult and pediatric patient populations vary in these indications.

[see Dosage and Administration (2) ] ZITHROMAX is a macrolide antibacterial drug indicated for mild to moderate infections caused by designated, susceptible bacteria: Acute bacterial exacerbations of chronic bronchitis in adults ( 1.1 ) Acute bacterial sinusitis in adults ( 1.1 ) Uncomplicated skin and skin structure infections in adults ( 1.1 ) Urethritis and cervicitis in adults ( 1.1 ) Genital ulcer disease in men ( 1.1 ) Acute otitis media in pediatric patients ( 1.2 ) Community-acquired pneumonia in adults and pediatric patients ( 1.1 , 1.2 ) Pharyngitis/tonsillitis in adults and pediatric patients ( 1.1 , 1.2 ) Limitation of Use: Azithromycin should not be used in patients with pneumonia who are judged to be inappropriate for oral therapy because of moderate to severe illness or risk factors.

( 1.3 ) To reduce the development of drug-resistant bacteria and maintain the effectiveness of ZITHROMAX (azithromycin) and other antibacterial drugs, ZITHROMAX (azithromycin) should be used only to treat infections that are proven or strongly suspected to be caused by susceptible bacteria.

1.1 Adult Patients Acute bacterial exacerbations of chronic bronchitis due to Haemophilus influenzae , Moraxella catarrhalis, or Streptococcus pneumoniae .

Acute bacterial sinusitis due to Haemophilus influenzae , Moraxella catarrhalis.

or Streptococcus pneumoniae .

Community-acquired pneumonia due to Chlamydophila pneumoniae , Haemophilus influenzae , Mycoplasma pneumoniae, or Streptococcus pneumoniae in patients appropriate for oral therapy.

Pharyngitis/tonsillitis caused by Streptococcus pyogenes as an alternative to first-line therapy in individuals who cannot use first-line therapy.

Uncomplicated skin and skin structure infections due to Staphylococcus aureus , Streptococcus pyogenes , or Streptococcus agalactiae .

Urethritis and cervicitis due to Chlamydia trachomatis or Neisseria gonorrhoeae .

Genital ulcer disease in men due to Haemophilus ducreyi (chancroid).

Due to the small number of women included in clinical trials, the efficacy of azithromycin in the treatment of chancroid in women has not been established.

1.2 Pediatric Patients [see Use in Specific Populations (8.4) and Clinical Studies (14.2) ] Acute otitis media ( >6 months of age) c aused by Haemophilus influenzae , Moraxella catarrhalis, or Streptococcus pneumoniae Community-acquired pneumonia ( >6 months of age) due to Chlamydophila pneumoniae , Haemophilus influenzae , Mycoplasma pneumonia , or Streptococcus pneumoniae in patients appropriate for oral therapy.

Pharyngitis/tonsillitis ( > 2 years of age ) caused by Streptococcus pyogenes as an alternative to first-line therapy in individuals who cannot use first-line therapy.

1.3 Limitations of Use Azithromycin should not be used in patients with pneumonia who are judged to be inappropriate for oral therapy because of moderate to severe illness or risk factors such as any of the following: patients with cystic fibrosis, patients with nosocomial infections, patients with known or suspected bacteremia, patients requiring hospitalization, elderly or debilitated patients, or patients with significant underlying health problems that may compromise their ability to respond to their illness (including immunodeficiency or functional asplenia).

PEDIATRIC USE

8.4 Pediatric Use [see Clinical Pharmacology (12.3) , Indications and Usage (1.2) , and Dosage and Administration (2.2) ] Safety and effectiveness in the treatment of pediatric patients with acute otitis media, acute bacterial sinusitis and community-acquired pneumonia under 6 months of age have not been established.

Use of ZITHROMAX for the treatment of acute bacterial sinusitis and community-acquired pneumonia in pediatric patients (6 months of age or greater) is supported by adequate and well-controlled trials in adults Pharyngitis/Tonsillitis: Safety and effectiveness in the treatment of pediatric patients with pharyngitis/tonsillitis under 2 years of age have not been established.

PREGNANCY

8.1 Pregnancy Teratogenic Effects: Pregnancy Category B: Reproduction studies have been performed in rats and mice at doses up to moderately maternally toxic dose concentrations (i.e., 200 mg/kg/day).

These daily doses in rats and mice, based on body surface area, are estimated to be 4 and 2 times, respectively, an adult daily dose of 500 mg.

In the animal studies, no evidence of harm to the fetus due to azithromycin was found.

There are, however, no adequate and well-controlled studies in pregnant women.

Because animal reproduction studies are not always predictive of human response, azithromycin should be used during pregnancy only if clearly needed.

NUSRING MOTHERS

8.3 Nursing Mothers Azithromycin has been reported to be excreted in human breast milk in small amounts.

Caution should be exercised when azithromycin is administered to a nursing woman.

WARNING AND CAUTIONS

5 WARNINGS AND PRECAUTIONS Serious (including fatal) allergic and skin reactions: Discontinue ZITHROMAX if reaction occurs.

( 5.1 ) Hepatotoxicity: Severe, and sometimes fatal, hepatotoxicity has been reported, Discontinue ZITHROMAX immediately if signs and symptoms of hepatitis occur.

( 5.2 ) Prolongation of QT interval and cases of torsades de pointes have been reported.

This risk which can be fatal should be considered in patients with certain cardiovascular disorders including known QT prolongation or history torsades de pointes, those with proarrhythmic conditions, and with other drugs that prolong the QT interval.

( 5.3 ) Clostridium difficile -associated diarrhea: Evaluate patients if diarrhea occurs.

( 5.4 ) ZITHROMAX may exacerbate muscle weakness in persons with myasthenia gravis.

( 5.5 ) 5.1 Hypersensitivity Serious allergic reactions, including angioedema, anaphylaxis, and dermatologic reactions including Stevens-Johnson syndrome, and toxic epidermal necrolysis have been reported in patients on azithromycin therapy.

[see Contraindications (4.1) ] Fatalities have been reported.

Cases of Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) have also been reported.

Despite initially successful symptomatic treatment of the allergic symptoms, when symptomatic therapy was discontinued, the allergic symptoms recurred soon thereafter in some patients without further azithromycin exposure.

These patients required prolonged periods of observation and symptomatic treatment.

The relationship of these episodes to the long tissue half-life of azithromycin and subsequent prolonged exposure to antigen is presently unknown.

If an allergic reaction occurs, the drug should be discontinued and appropriate therapy should be instituted.

Physicians should be aware that allergic symptoms may reappear when symptomatic therapy has been discontinued.If an allergic reaction occurs, the drug should be discontinued and appropriate therapy should be instituted.

Physicians should be aware that allergic symptoms may reappear when symptomatic therapy has been discontinued.

5.2 Hepatotoxicity Abnormal liver function, hepatitis, cholestatic jaundice, hepatic necrosis, and hepatic failure have been reported, some of which have resulted in death.

Discontinue azithromycin immediately if signs and symptoms of hepatitis occur.

5.3 QT Prolongation Prolonged cardiac repolarization and QT interval, imparting a risk of developing cardiac arrhythmia and torsades de pointes, have been seen with treatment with macrolides, including azithromycin.

Cases of torsades de pointes have been spontaneously reported during postmarketing surveillance in patients receiving azithromycin.

Providers should consider the risk of QT prolongation which can be fatal when weighing the risks and benefits of azithromycin for at-risk groups including: patients with known prolongation of the QT interval, a history of torsades de pointes, congenital long QT syndrome, bradyarrhythmias or uncompensated heart failure patients on drugs known to prolong the QT interval patients with ongoing proarrhythmic conditions such as uncorrected hypokalemia or hypomagnesemia, clinically significant bradycardia, and in patients receiving Class IA (quinidine, procainamide) or Class III (dofetilide, amiodarone, sotalol) antiarrhythmic agents.

Elderly patients may be more susceptible to drug-associated effects on the QT interval.

5.4 Clostridium difficile -Associated Diarrhea (CDAD) Clostridium difficile -associated diarrhea has been reported with use of nearly all antibacterial agents, including ZITHROMAX, and may range in severity from mild diarrhea to fatal colitis.

Treatment with antibacterial agents alters the normal flora of the colon, leading to overgrowth of C.

difficile .

C.

difficile produces toxins A and B which contribute to the development of CDAD.

Hypertoxin producing strains of C.

difficile cause increased morbidity and mortality, as these infections can be refractory to antibacterial therapy and may require colectomy.

CDAD must be considered in all patients who present with diarrhea following antibiotic use.

Careful medical history is necessary since CDAD has been reported to occur over two months after the administration of antibacterial agents.

If CDAD is suspected or confirmed, ongoing antibiotic use not directed against C.

difficile may need to be discontinued.

Appropriate fluid and electrolyte management, protein supplementation, antibiotic treatment of C.

difficile , and surgical evaluation should be instituted as clinically indicated.

5.5 Exacerbation of Myasthenia Gravis Exacerbation of symptoms of myasthenia gravis and new onset of myasthenic syndrome have been reported in patients receiving azithromycin therapy.

5.6 Use in Sexually Transmitted Infections ZITHROMAX, at the recommended dose, should not be relied upon to treat syphilis.

Antibacterial agents used to treat non-gonococcal urethritis may mask or delay the symptoms of incubating syphilis.

All patients with sexually transmitted urethritis or cervicitis should have a serologic test for syphilis and appropriate testing for gonorrhea performed at the time of diagnosis.

Appropriate antibacterial therapy and follow-up tests for these diseases should be initiated if infection is confirmed.

5.7 Development of Drug-Resistant Bacteria Prescribing ZITHROMAX in the absence of a proven or strongly suspected bacterial infection is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria.

INFORMATION FOR PATIENTS

17 PATIENT COUNSELING INFORMATION General Patient Counseling ZITHROMAX tablets and oral suspension can be taken with or without food.

Patients should also be cautioned not to take aluminum- and magnesium-containing antacids and azithromycin simultaneously.

The patient should be directed to discontinue azithromycin immediately and contact a physician if any signs of an allergic reaction occur.

Patients should be counseled that antibacterial drugs including ZITHROMAX (azithromycin) should only be used to treat bacterial infections.

They do not treat viral infections (e.g., the common cold).

When ZITHROMAX (azithromycin) is prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of the therapy, the medication should be taken exactly as directed.

Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by ZITHROMAX (azithromycin) or other antibacterial drugs in the future.

Diarrhea is a common problem caused by antibacterials which usually ends when the antibacterial is discontinued.

Sometimes after starting treatment with antibacterials patients can develop watery and bloody stools (with or without stomach cramps and fever) even as late as two or more months after having taken the last dose of the antibacterial drug.

If this occurs, patients should contact their physician as soon as possible.

See FDA-approved Patient Labeling Licensed from Pliva LAB-0023-16.0

DOSAGE AND ADMINISTRATION

2 Adult Patients ( 2.1 ) Infection Recommended Dose/Duration of Therapy Community-acquired pneumonia (mild severity) Pharyngitis/tonsillitis (second-line therapy) Skin/skin structure (uncomplicated) 500 mg as a single dose on Day 1, followed by 250 mg once daily on Days 2 through 5.

Acute bacterial exacerbations of chronic bronchitis (mild to moderate) 500 mg as a single dose on Day 1, followed by 250 mg once daily on Days 2 through 5 or 500 mg once daily for 3 days.

Acute bacterial sinusitis 500 mg once daily for 3 days.

Genital ulcer disease (chancroid) Non-gonococcal urethritis and cervicitis One single 1 gram dose.

Gonococcal urethritis and cervicitis One single 2 gram dose.

Pediatric Patients ( 2.2 ) Infection Recommended Dose/Duration of Therapy Acute otitis media 30 mg/kg as a single dose or 10 mg/kg once daily for 3 days or 10 mg/kg as a single dose on Day 1 followed by 5 mg/kg/day on Days 2 through 5.

Acute bacterial sinusitis 10 mg/kg once daily for 3 days.

Community-acquired pneumonia 10 mg/kg as a single dose on Day 1 followed by 5 mg/kg once daily on Days 2 through 5.

Pharyngitis/tonsillitis 12 mg/kg once daily for 5 days.

2.1 Adult Patients [see Indications and Usage (1.1) and Clinical Pharmacology (12.3) ] Infection DUE TO THE INDICATED ORGANISMS [see Indications and Usage (1.1)] Recommended Dose/Duration of Therapy Community-acquired pneumonia Pharyngitis/tonsillitis (second-line therapy) Skin/skin structure (uncomplicated) 500 mg as a single dose on Day 1, followed by 250 mg once daily on Days 2 through 5 Acute bacterial exacerbations of chronic obstructive pulmonary disease 500 mg once daily for 3 days OR 500 mg as a single dose on Day 1, followed by 250 mg once daily on Days 2 through 5 Acute bacterial sinusitis 500 mg once daily for 3 days Genital ulcer disease (chancroid) One single 1 gram dose Non-gonococcal urethritis and cervicitis One single 1 gram dose Gonococcal urethritis and cervicitis One single 2 gram dose ZITHROMAX tablets can be taken with or without food.

2.2 Pediatric Patients 1 Infection DUE TO THE INDICATED ORGANISMS [see Indications and Usage (1.2)] Recommended Dose/Duration of Therapy 1 see dosing tables below for maximum doses evaluated by indication Acute otitis media 30 mg/kg as a single dose or 10 mg/kg once daily for 3 days or 10 mg/kg as a single dose on Day 1 followed by 5 mg/kg/day on Days 2 through 5.

Acute bacterial sinusitis 10 mg/kg once daily for 3 days.

Community-acquired pneumonia 10 mg/kg as a single dose on Day 1 followed by 5 mg/kg once daily on Days 2 through 5.

Pharyngitis/tonsillitis 12 mg/kg once daily for 5 days.

ZITHROMAX for oral suspension can be taken with or without food.

PEDIATRIC DOSAGE GUIDELINES FOR OTITIS MEDIA, ACUTE BACTERIAL SINUSITIS, AND COMMUNITY-ACQUIRED PNEUMONIA (Age 6 months and above, [see Use in Specific Populations (8.4) ] ) Based on Body Weight OTITIS MEDIA AND COMMUNITY-ACQUIRED PNEUMONIA: (5-Day Regimen) Effectiveness of the 3-day or 1-day regimen in pediatric patients with community-acquired pneumonia has not been established.

Dosing Calculated on 10 mg/kg/day Day 1 and 5 mg/kg/day Days 2 to 5.

Weight 100 mg/5 mL 200 mg/5 mL Total mL per Treatment Course Total mg per Treatment Course Kg Lbs.

Day 1 Days 2–5 Day 1 Days 2–5 5 11 2.5 mL; (½ tsp) 1.25 mL;(¼ tsp) 7.5 mL 150 mg 10 22 5 mL; (1tsp) 2.5 mL; (½ tsp) 15 mL 300 mg 20 44 5 mL; (1 tsp) 2.5 mL; (½ tsp) 15 mL 600 mg 30 66 7.5 mL; (1½ tsp) 3.75 mL; (¾ tsp) 22.5 mL 900 mg 40 88 10 mL; (2 tsp) 5 mL; (1 tsp) 30 mL 1200 mg 50 and above 110 and above 12.5 mL; (2½ tsp) 6.25 mL; (1¼ tsp) 37.5 mL 1500 mg OTITIS MEDIA AND ACUTE BACTERIAL SINUSITIS: (3-Day Regimen) Effectiveness of the 5-day or 1-day regimen in pediatric patients with acute bacterial sinusitis has not been established.

Dosing Calculated on 10 mg/kg/day.

Weight 100 mg/5 mL 200 mg/5 mL Total mL per Treatment Course Total mg per Treatment Course Kg Lbs.

Days 1–3 Days 1–3 5 11 2.5 mL; (1/2 tsp) 7.5 mL 150 mg 10 22 5 mL; (1 tsp) 15 mL 300 mg 20 44 5 mL (1 tsp) 15 mL 600 mg 30 66 7.5 mL (1½ tsp) 22.5 mL 900 mg 40 88 10 mL (2 tsp) 30 mL 1200 mg 50 and above 110 and above 12.5 mL (2 ½ tsp) 37.5 mL 1500 mg OTITIS MEDIA: (1-Day Regimen) Dosing Calculated on 30 mg/kg as a single dose.

Weight 200 mg/5 mL Total mL per Treatment Course Total mg per Treatment Course Kg Lbs.

1-Day Regimen 5 11 3.75 mL;(3/4 tsp) 3.75 mL 150 mg 10 22 7.5 mL;(1½ tsp) 7.5 mL 300 mg 20 44 15 mL;(3 tsp) 15 mL 600 mg 30 66 22.5 mL;(4½ tsp) 22.5 mL 900 mg 40 88 30 mL;(6 tsp) 30 mL 1200 mg 50 and above 110 and above 37.5 mL;(7½ tsp) 37.5 mL 1500 mg The safety of re-dosing azithromycin in pediatric patients who vomit after receiving 30 mg/kg as a single dose has not been established.

In clinical studies involving 487 patients with acute otitis media given a single 30 mg/kg dose of azithromycin, 8 patients who vomited within 30 minutes of dosing were re-dosed at the same total dose.

Pharyngitis/Tonsillitis: The recommended dose of ZITHROMAX for children with pharyngitis/tonsillitis is 12 mg/kg once daily for 5 days.

(See chart below.) PEDIATRIC DOSAGE GUIDELINES FOR PHARYNGITIS/TONSILLITIS (Age 2 years and above, [see Use in Specific Populations (8.4) ] ) Based on Body Weight PHARYNGITIS/TONSILLITIS: (5-Day Regimen) Dosing Calculated on 12 mg/kg/day for 5 days.

Weight 200 mg/5 mL Total mL per Treatment Course Total mg per Treatment Course Kg Lbs.

Day 1–5 8 18 2.5 mL; (½ tsp) 12.5 mL 500 mg 17 37 5 mL; (1 tsp) 25 mL 1000 mg 25 55 7.5 mL; (1½ tsp) 37.5 mL 1500 mg 33 73 10 mL; (2 tsp) 50 mL 2000 mg 40 88 12.5 mL; (2½ tsp) 62.5 mL 2500 mg Constituting instructions for ZITHROMAX Oral Suspension 300, 600, 900, 1200 mg bottles.

The table below indicates the volume of water to be used for constitution: Amount of water to be added Total volume after constitution (azithromycin content) Azithromycin concentration after constitution 9 mL (300 mg) 15 mL (300 mg) 100 mg/5 mL 9 mL (600 mg) 15 mL (600 mg) 200 mg/5 mL 12 mL (900 mg) 22.5 mL (900 mg) 200 mg/5 mL 15 mL (1200 mg) 30 mL (1200 mg) 200 mg/5 mL Shake well before each use.

Oversized bottle provides shake space.

Keep tightly closed.

After mixing, store suspension at 5° to 30°C (41° to 86°F) and use within 10 days.

Discard after full dosing is completed.

potassium citrate 10 MEQ Extended Release Oral Tablet

Generic Name: POTASSIUM CITRATE
Brand Name: Potassium Citrate
  • Substance Name(s):
  • POTASSIUM CITRATE

DRUG INTERACTIONS

7 The following drug interactions may occur with potassium citrate: Potassium-sparing diuretics: concomitant administration should be avoided since the simultaneous administration of these agents can produce severe hyperkalemia (7.1) Drugs that slow gastrointestinal transit time: These agents (such as anticholinergics) can be expected to increase the gastrointestinal irritation produced by potassium salts (7.2) Renin-angiotensin-aldosterone inhibitors: Monitor for hyperkalemia (7.3) Nonsteroidal Anti-inflammatory drugs (NSAIDs) monitor for hyperkalemia (7.4) 7.1 Potential Effects of Potassium Citrate on Other Drugs Potassium-sparing Diuretics: Concomitant administration of potassium citrate and a potassium-sparing diuretic (such as triamterene, spironolactone or amiloride) should be avoided since the simultaneous administration of these agents can produce severe hyperkalemia.

7.2 Potential Effects of Other Drugs on Potassium Citrate Drugs that slow gastrointestinal transit time: These agents (such as anticholinergics) can be expected to increase the gastrointestinal irritation produced by potassium salts.

7.3 Renin-Angiotensin-Aldosterone System Inhibitors Drugs that inhibit the renin-angiotensin-aldosterone system (RAAS) including angiotensin converting enzyme (ACE) inhibitors, angiotensin receptor blockers (ARBs), spironolactone, eplerenone, or aliskiren produce potassium retention by inhibiting aldosterone production.

Closely monitor potassium in patients receiving concomitant RAAS therapy.

7.4 Nonsteroidal Anti-Inflammatory Drugs (NSAIDs) NSAIDs may produce potassium retention by reducing renal synthesis of prostagladin E and impairing the renin-angiotensin system.

Closely monitor potassium in patients on concomitant NSAIDs

OVERDOSAGE

10 Treatment of Overdosage: The administration of potassium salts to persons without predisposing conditions for hyperkalemia rarely causes serious hyperkalemia at recommended dosages.

It is important to recognize that hyperkalemia is usually asymptomatic and may be manifested only by an increased serum potassium concentration and characteristic electrocardiographic changes (peaking of T-wave, loss of P-wave, depression of S-T segment and prolongation of the QT interval).

Late manifestations include muscle paralysis and cardiovascular collapse from cardiac arrest.

Treatment measures for hyperkalemia include the following: Patients should be closely monitored for arrhythmias and electrolyte changes.

Elimination of medications containing potassium and of agents with potassium sparing properties such as potassium-sparing diuretics, ARBs, ACE inhibitors, NSAIDs, certain nutritional supplements and many others.

Elimination of foods containing high levels of potassium such as almonds, apricots, bananas, beans (lima, pinto, white), cantaloupe, carrot juice (canned), figs, grapefruit juice, halibut, milk, oat bran, potato (with skin), salmon, spinach, tuna and many others.

Intravenous calcium gluconate if the patient is at no risk or low risk of developing digitalis toxicity.

Intravenous administration of 300 to 500 mL/hr of 10% dextrose solution containing 10 to 20 units of crystalline insulin per 1,000 mL.

Correction of acidosis, if present, with intravenous sodium bicarbonate.

Hemodialysis or peritoneal dialysis.

Exchange resins may be used.

However, this measure alone is not sufficient for the acute treatment of hyperkalemia.

Lowering potassium levels too rapidly in patients taking digitalis can produce digitalis toxicity.

DESCRIPTION

11 Potassium citrate is a citrate salt of potassium.

Its molecular formula is K 3 C 6 H 5 O 7 • H 2 O, and it has the following chemical structure: Potassium citrate, USP is a transparent crystals or white, granular powder.

It is freely soluble in water and slightly soluble in alcohol.

Potassium citrate extended-release tablets, USP intended for oral administration, each contains 5 mEq (540 mg), 10 mEq (1,080 mg) or 15 mEq (1,620 mg) of potassium citrate, USP as monohydrate.

In addition, each tablet contains the following inactive ingredients: carnauba wax and magnesium stearate.

Meets USP Dissolution Test 2 Potassium citrate

CLINICAL STUDIES

14 The pivotal potassium citrate trials were non-randomized and non-placebo controlled where dietary management may have changed coincidentally with pharmacological treatment.

Therefore, the results as presented in the following sections may overstate the effectiveness of the product.

14.1 Renal Tubular Acidosis (RTA) with Calcium Stones The effect of oral potassium citrate therapy in a non-randomized, non-placebo controlled clinical study of five men and four women with calcium oxalate/calcium phosphate nephrolithiasis and documented incomplete distal renal tubular acidosis was examined.

The main inclusion criterion was a history of stone passage or surgical removal of stones during the 3 years prior to initiation of potassium citrate therapy.

All patients began alkali treatment with 60 to 80 mEq potassium citrate daily in 3 or 4 divided doses.

Throughout treatment, patients were instructed to stay on a sodium restricted diet (100 mEq/day) and to reduce oxalate intake (limited intake of nuts, dark roughage, chocolate and tea).

A moderate calcium restriction (400 to 800 mg/day) was imposed on patients with hypercalciuria.

X-rays of the urinary tract, available in all patients, were reviewed carefully to determine presence of pre-existing stones, appearance of new stones, or change in the number of stones.

Potassium citrate therapy was associated with inhibition of new stone formation in patients with distal tubular acidosis.

Three of the nine patients continued to pass stones during the on-treatment phase.

While it is likely that these patients passed preexisting stones during therapy, the most conservative assumption is that the passed stones were newly formed.

Using this assumption, the stone-passage remission rate was 67%.

All patients had a reduced stone formation rate.

Over the first 2 years of treatment, the on-treatment stone formation rate was reduced from 13±27 to 1±2 per year.

14.2 Hypocitraturic Calcium Oxalate Nephrolithiasis of any Etiology Eighty-nine patients with hypocitraturic calcium nephrolithiasis or uric acid lithiasis with or without calcium nephrolithiasis participated in this non-randomized, non-placebo controlled clinical study.

Four groups of patients were treated with potassium citrate: Group 1 was comprised of 19 patients, 10 with renal tubular acidosis and 9 with chronic diarrheal syndrome, Group 2 was comprised of 37 patients, 5 with uric acid stones alone, 6 with uric acid lithiasis and calcium stones, 3 with type 1 absorptive hypercalciuria, 9 with type 2 absorptive hypercalciuria and 14 with hypocitraturia.

Group 3 was comprised of 15 patients with history of relapse on other therapy and Group 4 was comprised of 18 patients, 9 with type 1 absorptive hypercalciuria and calcium stones, 1 with type 2 absorptive hypercalciuria and calcium stones, 2 with hyperuricosuric calcium oxalate nephrolithiasis, 4 with uric acid lithiasis accompanied by calcium stones and 2 with hypocitraturia and hyperuricemia accompanied by calcium stones.

The dose of potassium citrate ranged from 30 to 100 mEq per day, and usually was 20 mEq administered orally 3 times daily.

Patients were followed in an outpatient setting every 4 months during treatment and were studied over a period from 1 to 4.33 years.

A three-year retrospective pre-study history for stone passage or removal was obtained and corroborated by medical records.

Concomitant therapy (with thiazide or allopurinol) was allowed if patients had hypercalciuria, hyperuricosuria or hyperuricemia.

Group 2 was treated with potassium citrate alone.

In all groups, treatment that included potassium citrate was associated with a sustained increase in urinary citrate excretion from subnormal values to normal values (400 to 700 mg/day), and a sustained increase in urinary pH from 5.6 to 6 to approximately 6.5.

The stone formation rate was reduced in all groups as shown in Table 1.

Table 1 Effect of Potassium Citrate In Patients With Calcium Oxalate Nephrolithiasis.

Stones Formed Per Year Group Baseline On Treatment Remission Remission defined as “the percentage of patients remaining free of newly formed stones during treatment”.

Any Decrease I (n=19) 12 ± 30 0.9 ± 1.3 58% 95% II (n=37) 1.2 ± 2 0.4 ± 1.5 89% 97% III (n=15) 4.2 ± 7 0.7 ± 2 67% 100% IV (n=18) 3.4 ± 8 0.5 ± 2 94% 100% Total (n=89) 4.3 ± 15 0.6 ± 2 80% 98% 14.3 Uric Acid Lithiasis with or without Calcium Stones A long-term non-randomized, non-placebo controlled clinical trial with eighteen adult patients with uric acid lithiasis participated in the study.

Six patients formed only uric acid stones, and the remaining 12 patients formed mixed stones containing both uric acid and calcium salts or formed both uric acid stones (without calcium salts) and calcium stones (without uric acid) on separate occasions.

Eleven of the 18 patients received potassium citrate alone.

Six of the 7 other patients also received allopurinol for hyperuricemia with gouty arthritis, symptomatic hyperuricemia, or hyperuricosuria.

One patient also received hydrochlorothiazide because of unclassified hypercalciuria.

The main inclusion criterion was a history of stone passage or surgical removal of stones during the 3 years prior to initiation of potassium citrate therapy.

All patients received potassium citrate at a dosage of 30 to 80 mEq/day in three-to-four divided doses and were followed every four months for up to 5 years.

While on potassium citrate treatment, urinary pH rose significantly from a low value of 5.3 ± 0.3 to within normal limits (6.2 to 6.5).

Urinary citrate which was low before treatment rose to the high normal range and only one stone was formed in the entire group of 18 patients.

HOW SUPPLIED

16 /STORAGE AND HANDLING Potassium Citrate Extended-release Tablets, 10 mEq are tan to yellowish color, oval shaped, biconvex uncoated tablets debossed with “537” on one side and plain on the other side and are supplied as follows: Unit dose packages of 20 (5 x 4) NDC 68084-850-32 Storage: Store at 20° to 25°C (68° to 77°F) [See USP Controlled Room Temperature].

FOR YOUR PROTECTION: Do not use if blister is torn or broken.

DOSAGE FORMS AND STRENGTHS

3 5 mEq tablets are tan to yellowish color, round shaped, biconvex uncoated tablets debossed with “536” on one side and plain on the other side.

10 mEq tablets are tan to yellowish color, oval shaped, biconvex uncoated tablets debossed with “537” on one side and plain on the other side.

15 mEq tablets are tan to yellowish color, oblong shaped, biconvex uncoated tablets debossed with “538” on one side and plain on the other side.

Tablets: 5 mEq, 10 mEq and 15 mEq (3)

MECHANISM OF ACTION

12.1 Mechanism of Action When potassium citrate is given orally, the metabolism of absorbed citrate produces an alkaline load.

The induced alkaline load in turn increases urinary pH and raises urinary citrate by augmenting citrate clearance without measurably altering ultrafilterable serum citrate.

Thus, potassium citrate therapy appears to increase urinary citrate principally by modifying the renal handling of citrate, rather than by increasing the filtered load of citrate.

The increased filtered load of citrate may play some role, however, as in small comparisons of oral citrate and oral bicarbonate, citrate had a greater effect on urinary citrate.

In addition to raising urinary pH and citrate, potassium citrate increases urinary potassium by approximately the amount contained in the medication.

In some patients, potassium citrate causes a transient reduction in urinary calcium.

The changes induced by potassium citrate produce urine that is less conducive to the crystallization of stone-forming salts (calcium oxalate, calcium phosphate and uric acid).

Increased citrate in the urine, by complexing with calcium, decreases calcium ion activity and thus the saturation of calcium oxalate.

Citrate also inhibits the spontaneous nucleation of calcium oxalate and calcium phosphate (brushite).

The increase in urinary pH also decreases calcium ion activity by increasing calcium complexation to dissociated anions.

The rise in urinary pH also increases the ionization of uric acid to the more soluble urate ion.

Potassium citrate therapy does not alter the urinary saturation of calcium phosphate, since the effect of increased citrate complexation of calcium is opposed by the rise in pH-dependent dissociation of phosphate.

Calcium phosphate stones are more stable in alkaline urine.

In the setting of normal renal function, the rise in urinary citrate following a single dose begins by the first hour and lasts for 12 hours.

With multiple doses the rise in citrate excretion reaches its peak by the third day and averts the normally wide circadian fluctuation in urinary citrate, thus maintaining urinary citrate at a higher, more constant level throughout the day.

When the treatment is withdrawn, urinary citrate begins to decline toward the pretreatment level on the first day.

The rise in citrate excretion is directly dependent on the potassium citrate dosage.

Following long-term treatment, potassium citrate at a dosage of 60 mEq/day raises urinary citrate by approximately 400 mg/day and increases urinary pH by approximately 0.7 units.

In patients with severe renal tubular acidosis or chronic diarrheal syndrome where urinary citrate may be very low (<100 mg/day), potassium citrate may be relatively ineffective in raising urinary citrate.

A higher dose of potassium citrate may therefore be required to produce a satisfactory citraturic response.

In patients with renal tubular acidosis in whom urinary pH may be high, potassium citrate produces a relatively small rise in urinary pH.

INDICATIONS AND USAGE

1 Potassium citrate extended-release tablet is a citrate salt of potassium indicated for the management of: Renal tubular acidosis (RTA) with calcium stones (1.1) Hypocitraturic calcium oxalate nephrolithiasis of any etiology (1.2) Uric acid lithiasis with or without calcium stones (1.3) 1.1 Renal Tubular Acidosis (RTA) with Calcium Stones Potassium citrate is indicated for the management of renal tubular acidosis [see Clinical Studies (14.1) ].

1.2 Hypocitraturic Calcium Oxalate Nephrolithiasis of any Etiology Potassium citrate is indicated for the management of Hypocitraturic calcium oxalate nephrolithiasis [see Clinical Studies (14.2) ].

1.3 Uric Acid Lithiasis with or without Calcium Stones Potassium citrate is indicated for the management of Uric acid lithiasis with or without calcium stones [see Clinical Studies (14.3) ].

PEDIATRIC USE

8.4 Pediatric Use Safety and effectiveness in children have not been established.

PREGNANCY

8.1 Pregnancy Animal reproduction studies have not been conducted.

It is also not known whether potassium citrate can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity.

Potassium citrate should be given to a pregnant woman only if clearly needed.

NUSRING MOTHERS

8.3 Nursing Mothers The normal potassium ion content of human milk is about 13 mEq/L.

It is not known if potassium citrate has an effect on this content.

Potassium citrate should be given to a woman who is breastfeeding only if clearly needed.

WARNING AND CAUTIONS

5 WARNINGS AND PRECAUTIONS Hyperkalemia: In patients with impaired mechanisms for excreting potassium, potassium citrate administration can produce hyperkalemia and cardiac arrest.

Potentially fatal hyperkalemia can develop rapidly and be asymptomatic.

The use of potassium citrate in patients with chronic renal failure, or any other condition which impairs potassium excretion such as severe myocardial damage or heart failure, should be avoided (5.1) Gastrointestinal lesions: if there is severe vomiting, abdominal pain or gastrointestinal bleeding, potassium citrate should be discontinued immediately and the possibility of bowel perforation or obstruction investigated (5.2) 5.1 Hyperkalemia In patients with impaired mechanisms for excreting potassium, potassium citrate administration can produce hyperkalemia and cardiac arrest.

Potentially fatal hyperkalemia can develop rapidly and be asymptomatic.

The use of potassium citrate in patients with chronic renal failure, or any other condition which impairs potassium excretion such as severe myocardial damage or heart failure, should be avoided.

Closely monitor for signs of hyperkalemia with periodic blood tests and ECGs.

5.2 Gastrointestinal Lesions Solid dosage forms of potassium chlorides have produced stenotic and/or ulcerative lesions of the small bowel and deaths.

These lesions are caused by a high local concentration of potassium ions in the region of the dissolving tablets, which injured the bowel.

In addition, perhaps because wax-matrix preparations are not enteric-coated and release some of their potassium content in the stomach, there have been reports of upper gastrointestinal bleeding associated with these products.

The frequency of gastrointestinal lesions with wax-matrix potassium chloride products is estimated at one per 100,000 patient-years.

Experience with potassium citrate is limited, but a similar frequency of gastrointestinal lesions should be anticipated.

If there is severe vomiting, abdominal pain or gastrointestinal bleeding, potassium citrate should be discontinued immediately and the possibility of bowel perforation or obstruction investigated.

INFORMATION FOR PATIENTS

17 PATIENT COUNSELING INFORMATION 17.1 Administration of Drug Tell patients to take each dose without crushing, chewing or sucking the tablet.

Tell patients to take this medicine only as directed.

This is especially important if the patient is also taking both diuretics and digitalis preparations.

Tell patients to check with the doctor if there is trouble swallowing tablets or if the tablet seems to stick in the throat.

Tell patients to check with the doctor at once if tarry stools or other evidence of gastrointestinal bleeding is noticed.

Tell patients that their doctor will perform regular blood tests and electrocardiograms to ensure safety.

Call your doctor for medical advice about side effects.

You may report side effects to FDA at 1-800-FDA-1088.

DOSAGE AND ADMINISTRATION

2 Objective: To restore normal urinary citrate (greater than 320 mg/day and as close to the normal mean of 640 mg/day as possible), and to increase urinary pH to a level of 6 to 7.

Severe hypocitraturia (urinary citrate 150 mg/day): therapy should be initiated at 30 mEq per day; a dose of 15 mEq two times per day or 10 mEq three times per day with meals or within 30 minutes after meals or bedtime snack (2.3) 2.1 Dosing Instructions Treatment with extended release potassium citrate should be added to a regimen that limits salt intake (avoidance of foods with high salt content and of added salt at the table) and encourages high fluid intake (urine volume should be at least two liters per day).

The objective of treatment with potassium citrate extended-release tablets is to provide potassium citrate in sufficient dosage to restore normal urinary citrate (greater than 320 mg/day and as close to the normal mean of 640 mg/day as possible), and to increase urinary pH to a level of 6 or 7.

Monitor serum electrolytes (sodium, potassium, chloride and carbon dioxide), serum creatinine and complete blood counts every four months and more frequently in patients with cardiac disease, renal disease or acidosis.

Perform electrocardiograms periodically.

Treatment should be discontinued if there is hyperkalemia, a significant rise in serum creatinine or a significant fall in blood hematocrit or hemoglobin.

2.2 Severe Hypocitraturia In patients with severe hypocitraturia (urinary citrate < 150 mg/day), therapy should be initiated at a dosage of 60 mEq/day (30 mEq two times/day or 20 mEq three times/day with meals or within 30 minutes after meals or bedtime snack).

Twenty-four hour urinary citrate and/or urinary pH measurements should be used to determine the adequacy of the initial dosage and to evaluate the effectiveness of any dosage change.

In addition, urinary citrate and/or pH should be measured every four months.

Doses of potassium citrate extended-release tablets greater than 100 mEq/day have not been studied and should be avoided.

2.3 Mild to Moderate Hypocitraturia In patients with mild to moderate hypocitraturia (urinary citrate > 150 mg/day) therapy should be initiated at 30 mEq/day (15 mEq two times/day or 10 mEq three times/day with meals or within 30 minutes after meals or bedtime snack).

Twenty-four hour urinary citrate and/or urinary pH measurements should be used to determine the adequacy of the initial dosage and to evaluate the effectiveness of any dosage change.

Doses of potassium citrate extended-release tablet greater than 100 mEq/day have not been studied and should be avoided.