Dantrolene Sodium 25 MG Oral Capsule [Dantrium]

WARNINGS

It is important to recognize that fatal and non-fatal liver disorders of an idiosyncratic or hypersensitivity type may occur with Dantrium therapy.

At the start of Dantrium therapy, it is desirable to do liver function studies (SGOT, SGPT, alkaline phosphatase, total bilirubin) for a baseline or to establish whether there is pre-existing liver disease.

If baseline liver abnormalities exist and are confirmed, there is a clear possibility that the potential for Dantrium hepatotoxicity could be enhanced, although such a possibility has not yet been established.

Liver function studies (e.g., SGOT or SGPT) should be performed at appropriate intervals during Dantrium therapy.

If such studies reveal abnormal values, therapy should generally be discontinued.

Only where benefits of the drug have been of major importance to the patient, should reinitiation or continuation of therapy be considered.

Some patients have revealed a return to normal laboratory values in the face of continued therapy while others have not.

If symptoms compatible with hepatitis, accompanied by abnormalities in liver function tests or jaundice appear, Dantrium should be discontinued.

If caused by Dantrium and detected early, the abnormalities in liver function characteristically have reverted to normal when the drug was discontinued.

Dantrium therapy has been reinstituted in a few patients who have developed clinical and/or laboratory evidence of hepatocellular injury.

If such reinstitution of therapy is done, it should be attempted only in patients who clearly need Dantrium and only after previous symptoms and laboratory abnormalities have cleared.

The patient should be hospitalized and the drug should be restarted in very small and gradually increasing doses.

Laboratory monitoring should be frequent and the drug should be withdrawn immediately if there is any indication of recurrent liver involvement.

Some patients have reacted with unmistakable signs of liver abnormality upon administration of a challenge dose, while others have not.

Dantrium should be used with particular caution in females and in patients over 35 years of age in view of apparent greater likelihood of drug-induced, potentially fatal, hepatocellular disease in these groups.

Carcinogenesis, Mutagenesis, Impairment of Fertility: Long-term safety of Dantrium in humans has not been established.

Chronic studies in rats, dogs, and monkeys at dosages greater than 30 mg/kg/day showed growth or weight depression and signs of hepatopathy and possible occlusion nephropathy, all of which were reversible upon cessation of treatment.

Sprague-Dawley female rats fed dantrolene sodium for 18 months at dosage levels of 15, 30, and 60 mg/kg/day showed an increased incidence of benign and malignant mammary tumors compared with concurrent controls.

At the highest dose level, there was an increase in the incidence of benign hepatic lymphatic neoplasms.

In a 30-month study at the same dose levels also in Sprague-Dawley rats, dantrolene sodium produced a decrease in the time of onset of mammary neoplasms.

Female rats at the highest dose level showed an increased incidence of hepatic lymphangiomas and hepatic angiosarcomas.

The only drug-related effect seen in a 30-month study in Fischer-344 rats was a dose-related reduction in the time of onset of mammary and testicular tumors.

A 24-month study in HaM/ICR mice revealed no evidence of carcinogenic activity.

Carcinogenicity in humans cannot be fully excluded, so that this possible risk of chronic administration must be weighed against the benefits of the drug (i.e., after a brief trial) for the individual patient.

Dantrolene sodium has produced positive results in the Ames S.

Typhimurium bacterial mutagenesis assay in the presence and absence of a liver activating system.

Pregnancy: Pregnancy Category C: Dantrium has been shown to be embryocidal in the rabbit and has been shown to decrease pup survival in the rat when given at doses seven times the human oral dose.

There are no adequate and well-controlled studies in pregnant women (see Labor and Delivery subheading for information regarding placental transfer of the drug).

Dantrium capsules should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Labor and Delivery: In one non-randomized open-label study, 21 term pregnant patients received prophylactic oral Dantrium 100 mg per day for 2 to 10 days prior to delivery.

Dantrolene readily crossed the placenta with maternal and fetal whole blood levels approximately equal at delivery; neonatal levels then fell approximately 50% per day for 2 days before declining sharply.

No neonatal respiratory and neuromuscular side effects were detected at low dose.

More data, at higher doses, are needed before more definitive conclusions can be made.

Nursing Mothers: Dantrium should not be used in nursing mothers.

Usage in Pediatric Patients: The long-term safety of Dantrium in pediatric patients under the age of 5 years has not been established.

Because of the possibility that adverse effects of the drug could become apparent only after many years, a benefit-risk consideration of the long-term use of Dantrium is particularly important in pediatric patients.

Drug Interactions: Drowsiness may occur with Dantrium therapy, and the concomitant administration of CNS depressants such as sedatives and tranquilizing agents may result in further drowsiness.

While a definite drug interaction with estrogen therapy has not yet been established, caution should be observed if the two drugs are to be given concomitantly.

Hepatotoxicity has occurred more often in women over 35 years of age receiving concomitant estrogen therapy.

Cardiovascular collapse in patients treated simultaneously with verapamil and dantrolene sodium is rare.

The combination of therapeutic doses of intravenous dantrolene sodium and verapamil in halothane/α-chloralose anesthetized swine has resulted in ventricular fibrillation and cardiovascular collapse in association with marked hyperkalemia.

Until the relevance of these findings to humans is established, the combination of dantrolene sodium and calcium channel blockers is not recommended during the management of malignant hyperthermia.

Administration of Dantrium may potentiate vecuronium-induced neuromuscular block.

DRUG INTERACTIONS

Drug Interactions: Drowsiness may occur with Dantrium therapy, and the concomitant administration of CNS depressants such as sedatives and tranquilizing agents may result in further drowsiness.

While a definite drug interaction with estrogen therapy has not yet been established, caution should be observed if the two drugs are to be given concomitantly.

Hepatotoxicity has occurred more often in women over 35 years of age receiving concomitant estrogen therapy.

Cardiovascular collapse in patients treated simultaneously with verapamil and dantrolene sodium is rare.

The combination of therapeutic doses of intravenous dantrolene sodium and verapamil in halothane/α-chloralose anesthetized swine has resulted in ventricular fibrillation and cardiovascular collapse in association with marked hyperkalemia.

Until the relevance of these findings to humans is established, the combination of dantrolene sodium and calcium channel blockers is not recommended during the management of malignant hyperthermia.

Administration of Dantrium may potentiate vecuronium-induced neuromuscular block.

OVERDOSAGE

OVERDOSE Symptoms which may occur in case of overdose include, but are not limited to, muscular weakness and alterations in the state of consciousness (e.g.

lethargy, coma), vomiting, diarrhea, and crystalluria.

For acute overdose, general supportive measures should be employed along with immediate gastric lavage.

Intravenous fluids should be administered in fairly large quantities to avert the possibility of crystalluria.

An adequate airway should be maintained and artificial resuscitation equipment should be at hand.

Electrocardiographic monitoring should be instituted, and the patient carefully observed.

To date, no experience has been reported with dialysis and its value in Dantrium overdose is not known.

DESCRIPTION

The chemical formula of Dantrium (dantrolene sodium) is hydrated 1-[[[5-(4-nitrophenyl)-2-furanyl]methylene]amino]-2, 4-imidazolidinedione sodium salt.

It is an orange powder, slightly soluble in water, but due to its slightly acidic nature the solubility increases somewhat in alkaline solution.

The anhydrous salt has a molecular weight of 336.

The hydrated salt contains approximately 15% water (3-1/2 moles) and has a molecular weight of 399.

The structural formula for the hydrated salt is: Dantrium is supplied in capsules of 25 mg, 50 mg, and 100 mg.

Inactive Ingredients: Each capsule contains edible black ink, FD&C Yellow No.

6, gelatin, lactose, magnesium stearate, starch, synthetic iron oxide red, synthetic iron oxide yellow, talc, and titanium dioxide.

HOW SUPPLIED

Dantrium (dantrolene sodium) is available in: 25-mg opaque, orange and tan capsules: NDC 0149-0030-05 bottle of 100 NDC 0149-0030-66 bottle of 500 50-mg opaque, orange and tan capsules: NDC 0149-0031-05 bottle of 100 100-mg opaque, orange and tan capsules: NDC 0149-0033-05 bottle of 100 Avoid excessive heat (over 104°F or 40°C).

Address medical inquiries to Procter & Gamble Pharmaceuticals, Medical Communications Department, PO Box 8006, Mason, Ohio 45040-8006.

INDICATIONS AND USAGE

In Chronic Spasticity: Dantrium is indicated in controlling the manifestations of clinical spasticity resulting from upper motor neuron disorders (e.g., spinal cord injury, stroke, cerebral palsy, or multiple sclerosis).

It is of particular benefit to the patient whose functional rehabilitation has been retarded by the sequelae of spasticity.

Such patients must have presumably reversible spasticity where relief of spasticity will aid in restoring residual function.

Dantrium is not indicated in the treatment of skeletal muscle spasm resulting from rheumatic disorders.

If improvement occurs, it will ordinarily occur within the dosage titration (see DOSAGE AND ADMINISTRATION ), and will be manifested by a decrease in the severity of spasticity and the ability to resume a daily function not quite attainable without Dantrium.

Occasionally, subtle but meaningful improvement in spasticity may occur with Dantrium therapy.

In such instances, information regarding improvement should be solicited from the patient and those who are in constant daily contact and attendance with him.

Brief withdrawal of Dantrium for a period of 2 to 4 days will frequently demonstrate exacerbation of the manifestations of spasticity and may serve to confirm a clinical impression.

A decision to continue the administration of Dantrium on a long-term basis is justified if introduction of the drug into the patient’s regimen: produces a significant reduction in painful and/or disabling spasticity such as clonus, or permits a significant reduction in the intensity and/or degree of nursing care required, or rids the patient of any annoying manifestation of spasticity considered important by the patient himself.

In Malignant Hyperthermia: Oral Dantrium is also indicated preoperatively to prevent or attenuate the development of signs of malignant hyperthermia in known, or strongly suspect, malignant hyperthermia susceptible patients who require anesthesia and/or surgery.

Currently accepted clinical practices in the management of such patients must still be adhered to (careful monitoring for early signs of malignant hyperthermia, minimizing exposure to triggering mechanisms and prompt use of intravenous dantrolene sodium and indicated supportive measures should signs of malignant hyperthermia appear); see also the package insert for Dantrium ® (dantrolene sodium) Intravenous.

Oral Dantrium should be administered following a malignant hyperthermic crisis to prevent recurrence of the signs of malignant hyperthermia.

PEDIATRIC USE

Usage in Pediatric Patients: The long-term safety of Dantrium in pediatric patients under the age of 5 years has not been established.

Because of the possibility that adverse effects of the drug could become apparent only after many years, a benefit-risk consideration of the long-term use of Dantrium is particularly important in pediatric patients.

PREGNANCY

Pregnancy: Pregnancy Category C: Dantrium has been shown to be embryocidal in the rabbit and has been shown to decrease pup survival in the rat when given at doses seven times the human oral dose.

There are no adequate and well-controlled studies in pregnant women (see Labor and Delivery subheading for information regarding placental transfer of the drug).

Dantrium capsules should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

NUSRING MOTHERS

Nursing Mothers: Dantrium should not be used in nursing mothers.

BOXED WARNING

Dantrium (dantrolene sodium) has a potential for hepatotoxicity, and should not be used in conditions other than those recommended.

Symptomatic hepatitis (fatal and non-fatal) has been reported at various dose levels of the drug.

The incidence reported in patients taking up to 400 mg/day is much lower than in those taking doses of 800 mg or more per day.

Even sporadic short courses of these higher dose levels within a treatment regimen markedly increased the risk of serious hepatic injury.

Liver dysfunction as evidenced by blood chemical abnormalities alone (liver enzyme elevations) has been observed in patients exposed to Dantrium for varying periods of time.

Overt hepatitis has occurred at varying intervals after initiation of therapy, but has been most frequently observed between the third and twelfth month of therapy.

The risk of hepatic injury appears to be greater in females, in patients over 35 years of age, and in patients taking other medication(s) in addition to Dantrium (dantrolene sodium).

Dantrium should be used only in conjunction with appropriate monitoring of hepatic function including frequent determination of SGOT or SGPT.

If no observable benefit is derived from the administration of Dantrium after a total of 45 days, therapy should be discontinued.

The lowest possible effective dose for the individual patient should be prescribed.

INFORMATION FOR PATIENTS

Information for Patients: Patients should be cautioned against driving a motor vehicle or participating in hazardous occupations while taking Dantrium .

Caution should be exercised in the concomitant administration of tranquilizing agents.

Dantrium might possibly evoke a photosensitivity reaction; patients should be cautioned about exposure to sunlight while taking it.

DOSAGE AND ADMINISTRATION

For Use in Chronic Spasticity: Prior to the administration of Dantrium , consideration should be given to the potential response to treatment.

A decrease in spasticity sufficient to allow a daily function not otherwise attainable should be the therapeutic goal of treatment with Dantrium .

Refer to INDICATIONS AND USAGE section for description of response to be anticipated.

It is important to establish a therapeutic goal (regain and maintain a specific function such as therapeutic exercise program, utilization of braces, transfer maneuvers, etc.) before beginning Dantrium therapy.

Dosage should be increased until the maximum performance compatible with the dysfunction due to underlying disease is achieved.

No further increase in dosage is then indicated.

Usual Dosage: It is important that the dosage be titrated and individualized for maximum effect.

The lowest dose compatible with optimal response is recommended.

In view of the potential for liver damage in long-term Dantrium use, therapy should be stopped if benefits are not evident within 45 days.

Adults: The following gradual titration schedule is suggested.

Some patients will not respond until higher daily dosage is achieved.

Each dosage level should be maintained for seven days to determine the patient’s response.

If no further benefit is observed at the next higher dose, dosage should be decreased to the previous lower dose.

25 mg once daily for seven days, then 25 mg t.i.d.

for seven days 50 mg t.i.d.

for seven days 100 mg t.i.d.

Therapy with a dose four times daily may be necessary for some individuals.

Doses higher than 100 mg four times daily should not be used.

(See Box Warning.

) Pediatric Patients: The following gradual titration schedule is suggested.

Some patients will not respond until higher daily dosage is achieved.

Each dosage level should be maintained for seven days to determine the patient’s response.

If no further benefit is observed at the next higher dose, dosage should be decreased to the previous lower dose.

0.5 mg/kg once daily for seven days, then 0.5 mg/kg t.i.d.

for seven days 1 mg/kg t.i.d.

for seven days 2 mg/kg t.i.d.

Therapy with a dose four times daily may be necessary for some individuals.

Doses higher than 100 mg four times daily should not be used.

(See Box Warning.

) For Malignant Hyperthermia: Preoperatively: Administer 4 to 8 mg/kg/day of oral Dantrium in 3 or 4 divided doses for one or two days prior to surgery, with the last dose being given approximately 3 to 4 hours before scheduled surgery with a minimum of water.

This dosage will usually be associated with skeletal muscle weakness and sedation (sleepiness or drowsiness); adjustment can usually be made within the recommended dosage range to avoid incapacitation or excessive gastrointestinal irritation (including nausea and/or vomiting).

Post Crisis Follow-up: Oral Dantrium should also be administered following a malignant hyperthermia crisis, in doses of 4 to 8 mg/kg per day in four divided doses, for a one to three day period to prevent recurrence of the manifestations of malignant hyperthermia.