Acetazolamide 250 MG Oral Tablet
Generic Name: ACETAZOLAMIDE
Brand Name: acetazolamide
- Substance Name(s):
Fatalities have occurred, although rarely, due to severe reactions to sulfonamides including Stevens-Johnson syndrome, toxic epidermal necrolysis, fulminant hepatic necrosis, agranulocytosis, aplastic anemia, and other blood dyscrasias.
Sensitizations may recur when a sulfonamide is readministered irrespective of the route of administration.
If signs of hypersensitivity or other serious reactions occur, discontinue use of this drug.
Caution is advised for patients receiving concomitant highdose aspirin and acetazolamide, as anorexia, tachypnea, lethargy, coma and death have been reported.
No data are available regarding acetazolamide overdosage in humans as no cases of acute poisoning with this drug have been reported.
Animal data suggest that acetazolamide is remarkably nontoxic.
No specific antidote is known.
Treatment should be symptomatic and supportive.
Electrolyte imbalance, development of an acidotic state, and central nervous effects might be expected to occur.
Serum electrolyte levels (particularly potassium) and blood pH levels should be monitored.
Supportive measures are required to restore electrolyte and pH balance.
The acidotic state can usually be corrected by the administration of bicarbonate.
Despite its high intraerythrocytic distribution and plasma protein binding properties, acetazolamide may be dialyzable.
This may be particularly important in the management of acetazolamide overdosage when complicated by the presence of renal failure.
Acetazolamide, an inhibitor of the enzyme carbonic anhydrase is a white to faintly yellowish white crystalline, odorless powder, weakly acidic, very slightly soluble in water and slightly soluble in alcohol.
The chemical name for acetazolamide is N-(5-Sulfamoyl-1,3,4-thiadiazol-2-yl)-acetamide and has the following chemical structure: Molecular Weight: 222.25 Molecular Formula: C4H6N4 O3S2 Acetazolamide tablets, USP are available for oral administration each containing 125 mg and 250 mg of acetazolamide respectively.
Additionally, they contain the following inactive ingredients: lactose monohydrate, magnesium stearate, microcrystalline cellulose, povidone, pregelatinized starch, sodium lauryl sulfate, and sodium starch glycolate.
Acetazolamide Tablets USP, 125 mg are available for oral administration as white to off white, round tablet, debossed HP 287 on one side and scored on other side.
They are supplied as follows: Bottles of 100 Tablets NDC 23155-287-01 Bottles of 1000 Tablets NDC 23155-287-10 Acetazolamide Tablets USP, 250 mg are available for oral administration as white to off white, round tablet, debossed HP 288 on one side and scored in quarters on other side.
They are supplied as follows: Bottles of 100 Tablets NDC 23155-288-01 Bottles of 1000 Tablets NDC 23155-288-10 Store at 20° to 25°C (68° to 77°F); excursions permitted between 15° to 30°C (59° to 86°F).
[See USP Controlled Room Temperature].
Dispense in a tight, light-resistant container as defined in the USP using a child-resistant closure.
Keep container tightly closed.
KEEP THIS AND ALL MEDICATIONS OUT OF THE REACH OF CHILDREN.
Manufactured for: Heritage Pharmaceuticals Inc.
Eatontown, NJ 07724 1.866.901.DRUG (3784) 51U000000129US02 Revised: 08/2016 logo
INDICATIONS AND USAGE
For adjunctive treatment of: edema due to congestive heart failure; drug-induced edema; centrencephalic epilepsies (petit mal, unlocalized seizures); chronic simple (open-angle) glaucoma, secondary glaucoma, and preoperatively in acute angle-closure glaucoma where delay of surgery is desired in order to lower intraocular pressure.
Acetazolamide Tablets are also indicated for the prevention or amelioration of symptoms associated with acute mountain sickness in climbers attempting rapid ascent and in those who are very susceptible to acute mountain sickness despite gradual ascent.
Pediatric Use The safety and effectiveness of acetazolamide in pediatric patients has not been established.
Pregnancy Teratogenic Effect Pregnancy Category C Acetazolamide, administered orally or parenterally, has been shown to be teratogenic (defects of the limbs) in mice, rats, hamsters and rabbits.
There are no adequate and well-controlled studies in pregnant women.
Acetazolamide should be used in pregnancy only if the potential benefit justifies the potential risk to the fetus.
Nursing Mothers Because of the potential for serious adverse reaction in nursing infants from acetazolamide, 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 Adverse reactions common to all sulfonamide derivatives may occur: anaphylaxis, fever, rash (including erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis), crystalluria, renal calculus, bone marrow depression, thrombocytopenic purpura, hemolytic anemia, leukopenia, pancytopenia and agranulocytosis.
Precaution is advised for early detection of such reactions and the drug should be discontinued and appropriate therapy instituted.
In patients with pulmonary obstruction or emphysema where alveolar ventilation may be impaired, acetazolamide, which may precipitate or aggravate acidosis, should be used with caution.
Gradual ascent is desirable to try to avoid acute mountain sickness.
If rapid ascent is undertaken and acetazolamide tablets are used, it should be noted that such use does not obviate the need for prompt descent if severe forms of high altitude sickness occur, i.e., high altitude pulmonary edema (HAPE) or high altitude cerebral edema.
Caution is advised for patients receiving concomitant highdose aspirin and acetazolamide, as anorexia, tachypnea, lethargy, coma and death have been reported (see WARNINGS ).
DOSAGE AND ADMINISTRATION
Glaucoma Acetazolamide should be used as an adjunct to the usual therapy.
The dosage employed in the treatment of chronic simple (open-angle) glaucoma ranges from 250 mg to 1 g of acetazolamide per 24 hours, usually in divided doses for amounts over 250 mg.
It has usually been found that a dosage in excess of 1 g per 24 hours does not produce an increased effect.
In all cases, the dosage should be adjusted with careful individual attention both to symptomatology and ocular tension.
Continuous supervision by a physician is advisable.
In treatment of secondary glaucoma and in the preoperative treatment of some cases of acute congestive (closed-angle) glaucoma, the preferred dosage is 250 mg every four hours, although some cases have responded to 250 mg twice daily on short-term therapy.
In some acute cases, it may be more satisfactory to administer an initial dose of 500 mg followed by 125 or 250 mg every four hours depending on the individual case.
A complementary effect has been noted when acetazolamide has been used in conjunction with miotics or mydriatics as the case demanded.
Epilepsy It is not clearly known whether the beneficial effects observed in epilepsy are due to direct inhibition of carbonic anhydrase in the central nervous system or whether they are due to the slight degree of acidosis produced by the divided dosage.
The best results to date have been seen in petit mal in children.
Good results, however, have been seen in patients, both children and adult, in other types of seizures such as grand mal, mixed seizure patterns, myoclonic jerk patterns, etc.
The suggested total daily dose is 8 to 30 mg per kg in divided doses.
Although some patients respond to a low dose, the optimum range appears to be from 375 to 1000 mg daily.
However, some investigators feel that daily doses in excess of 1 g do not produce any better results than a 1 g dose.
When acetazolamide tablets are given in combination with other anticonvulsants, it is suggested that the starting dose should be 250 mg once daily in addition to the existing medications.
This can be increased to levels as indicated above.
The change from other medications to acetazolamide should be gradual and in accordance with usual practice in epilepsy therapy.
Congestive Heart Failure For diuresis in congestive heart failure, the starting dose is usually 250 to 375 mg once daily in the morning (5 mg/kg).
If, after an initial response, the patient fails to continue to lose edema fluid, do not increase the dose but allow for kidney recovery by skipping medication for a day.
Acetazolamide tablets yield best diuretic results when given on alternate days, or for two days alternating with a day of rest.
Failures in therapy may be due to overdosage or too frequent dosage.
The use of acetazolamide does not eliminate the need for other therapy such as digitalis, bed rest, and salt restriction.
Drug-Induced Edema Recommended dosage is 250 to 375 mg of acetazolamide once a day for one or two days, alternating with a day of rest.
Acute Mountain Sickness Dosage is 500 mg to 1000 mg daily, in divided doses.
In circumstances of rapid ascent, such as in rescue or military operations, the higher dose level of 1000 mg is recommended.
It is preferable to initiate dosing 24 to 48 hours before ascent and to continue for 48 hours while at high altitude, or longer as necessary to control symptoms.
Note: The dosage recommendations for glaucoma and epilepsy differ considerably from those for congestive heart failure, since the first two conditions are not dependent upon carbonic anhydrase inhibition in the kidney which requires intermittent dosage if it is to recover from the inhibitory effect of the therapeutic agent.