HOW SUPPLIED SECTION.

HOW SUPPLIED:. Methazolamide Tablets USP, 25 mg are round, white tablets, debossed EFF on one side and 21 on the other side and are supplied in bottles of 100, NDC 0574-0790-01.Methazolamide Tablets USP, 50 mg are round, white, scored tablets debossed EFF on one side and 20 on the other side and are supplied in bottles of 100, NDC 0574-0791-01.Store at 20 to 25C (68 to 77F) [see USP Controlled Room Temperature].Dispense in tight container as defined in the USP, with child-resistant closure (as required).Rx OnlyManufactured for PerrigoMinneapolis, MN 55427Code 617M00Rev 04-14 A5P800 RC J1.

INDICATIONS & USAGE SECTION.

INDICATIONS AND USAGE:. Methazolamide Tablets USP is indicated in the treatment of ocular conditions where lowering intraocular pressure is likely to be of therapeutic benefit, such as chronic open-angle glaucoma, secondary glaucoma, and preoperatively in acute angle-closure glaucoma where lowering the intraocular pressure is desired before surgery.

ADVERSE REACTIONS SECTION.

ADVERSE REACTIONS:. Adverse reactions, occurring most often early in therapy, include paresthesias, particularly tingling feeling in the extremities; hearing dysfunction or tinnitus; fatigue; malaise; loss of appetite; taste alteration; gastrointestinal disturbances such as nausea, vomiting, and diarrhea; polyuria; and occasional instances of drowsiness and confusion.Metabolic acidosis and electrolyte imbalance may occur.Transient myopia has been reported. This condition invariably subsides upon diminution or discontinuance of the medication.Other occasional adverse reactions include urticaria, melena, hematuria, glycosuria, hepatic insufficiency, flaccid paralysis, photosensitivity, convulsions, and, rarely, crystalluria and renal calculi. Also see PRECAUTIONS: Information for Patients for possible reactions common to sulfonamide derivatives. 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 (see WARNINGS).

CARCINOGENESIS & MUTAGENESIS & IMPAIRMENT OF FERTILITY SECTION.

Carcinogenesis, Mutagenesis, Impairment of Fertility:. Long-term studies in animals to evaluate the carcinogenic potential of methazolamide and its effect on fertility have not been conducted. Methazolamide was not mutagenic in the Ames bacterial test.

CLINICAL PHARMACOLOGY SECTION.

CLINICAL PHARMACOLOGY:. Methazolamide is potent inhibitor of carbonic anhydrase.Methazolamide is well absorbed from the gastrointestinal tract. Peak plasma concentrations are observed to hours after dosing. In multiple-dose, pharmacokinetic study, administration of methazolamide 25 mg bid, 50 mg bid, and 100 mg bid demonstrated linear relationship between plasma methazolamide levels and methazolamide dose. Peak plasma concentrations (Cmax) for the 25 mg, 50 mg and 100 mg bid regimens were 2.5 mcg/mL, 5.1 mcg/mL, and 10.7 mcg/mL, respectively. The area under the plasma concentration time curves (AUC) was 1130 mcg.min/mL, 2571 mcg.min/mL, and 5418 mcg.min/mL for the 25 mg, 50 mg, and 100 mg dosage regimens, respectively.Methazolamide is distributed throughout the body including the plasma, cerebrospinal fluid, aqueous humor of the eye, red blood cells, bile and extracellular fluid. The mean apparent volume of distribution (Varea/F) ranges from 17 to 23 L. Approximately 55% is bound to plasma proteins. The steady-state methazolamide red blood cell: plasma ratio varies with dose and was found to be 27:1, 16:1, and 10:1 following the administration of methazolamide 25 mg bid, 50 mg bid, and 100 mg bid, respectively.The mean steady-state plasma elimination half-life for methazolamide is approximately 14 hours. At steady-state, approximately 25% of the dose is recovered unchanged in the urine over the dosing interval. Renal clearance accounts for 20% to 25% of the total clearance of drug. After repeated bid-tid dosing, methazolamide accumulates to steady-state concentrations in days.Methazolamides inhibitory action on carbonic anhydrase decreases the secretion of aqueous humor and results in decrease in intraocular pressure. The onset of the decrease in intraocular pressure generally occurs within to hours, has peak effect in to hours and total duration of 10 to 18 hours.Methazolamide is sulfonamide derivative; however, it does not have any clinically significant antimicrobial properties. Although methazolamide achieves high concentration in the cerebrospinal fluid, it is not considered an effective anticonvulsant.Methazolamide has weak and transient diuretic effect; therefore, use results in an increase in urinary volume, with excretion of sodium, potassium, and chloride. The drug should not be used as diuretic. Inhibition of renal bicarbonate reabsorption produces an alkaline urine. Plasma bicarbonate decreases, and relative, transient metabolic acidosis may occur due to disequilibrium in carbon dioxide transport in the red blood cell. Urinary citrate excretion is decreased by approximately 40% after doses of 100 mg every hours. Uric acid output has been shown to decrease 36% in the first 24 hour period.

CONTRAINDICATIONS SECTION.

CONTRAINDICATIONS:. Methazolamide therapy is contraindicated in situations in which sodium and/or potassium serum levels are depressed, in cases of marked kidney or liver disease or dysfunction, in adrenal gland failure, and in hyperchloremic acidosis. In patients with cirrhosis, use may precipitate the development of hepatic encephalopathy.Long-term administration of methazolamide is contraindicated in patients with angle-closure glaucoma, since organic closure of the angle may occur in spite of lowered intraocular pressure.

DESCRIPTION SECTION.

DESCRIPTION:. Methazolamide, sulfonamide derivative, is white crystalline powder, weakly acidic, slightly soluble in water, alcohol and acetone. The chemical name for methazolamide is: N-[5-(aminosulfonyl)- 3-methyl-1,3,4-thiadiazol- 2(3H)-ylidene]-acetamide and it has the following structural formula:Each tablet, for oral administration, contains 25 mg or 50 mg methazolamide. In addition, each tablet contains the following inactive ingredients: colloidal silicon dioxide, croscarmellose sodium, dibasic calcium phosphate dihydrate, magnesium stearate (powder), and microcrystalline cellulose.. Chemical Structure.

DOSAGE & ADMINISTRATION SECTION.

DOSAGE AND ADMINISTRATION:. The effective therapeutic dose administered varies from 50 mg to 100 mg two or three times daily. The drug may be used concomitantly with miotic and osmotic agents.

DRUG INTERACTIONS SECTION.

Drug Interactions:. Methazolamide should be used with caution in patients on steroid therapy because of the potential for developing hypokalemia.Caution is advised for patients receiving high-dose aspirin and methazolamide concomitantly, as anorexia, tachypnea, lethargy, coma and death have been reported with concomitant use of high-dose aspirin and carbonic anhydrase inhibitors (see WARNINGS).

GENERAL PRECAUTIONS SECTION.

General:. Potassium excretion is increased initially upon administration of methazolamide and in patients with cirrhosis or hepatic insufficiency could precipitate hepatic coma.In patients with pulmonary obstruction or emphysema, where alveolar ventilation may be impaired, methazolamide should be used with caution because it may precipitate or aggravate acidosis.

INFORMATION FOR PATIENTS SECTION.

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.Caution is advised for patients receiving high-dose aspirin and methazolamide concomitantly.

LABORATORY TESTS SECTION.

Laboratory Tests:. To monitor for hematologic reactions common to all sulfonamides, it is recommended that baseline CBC and platelet count be obtained on patients prior to initiating methazolamide therapy and at regular intervals during therapy. If significant changes occur, early discontinuance and institution of appropriate therapy are important. Periodic monitoring of serum electrolytes is also recommended.

NURSING MOTHERS SECTION.

Nursing Mothers:. It is not known whether this drug 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 methazolamide, decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.

OVERDOSAGE SECTION.

OVERDOSAGE:. No data is available regarding methazolamide overdosage in humans as no cases of acute poisoning with this drug have been reported. Animal data suggest that even high dose of methazolamide is nontoxic. No specific antidote is known. Treatment should be symptomatic and supportive.Electrolyte imbalance, development of an acidotic state, and central nervous system effects might be expected to occur. Serum electrolyte levels (particularly potassium) and blood pH levels should be monitored. Supportive measures may be required to restore electrolyte and pH balance.

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL.

PACKAGE/LABEL PRINCIPAL DISPLAY PANEL 25 mg Label. Rx OnlyNDC 0574-0790-01Methazolamide Tablets, USP25 mg100 TabletsThe following image is placeholder representing the product identifier that is either affixed or imprinted on the drug package label during the packaging operation.. 7F2RC-methazolamide-tablets.jpg. serialization-template.jpg.

PEDIATRIC USE SECTION.

Pediatric Use:. The safety and effectiveness of methazolamide in pediatric patients have not been established.

PRECAUTIONS SECTION.

PRECAUTIONS:. General:. Potassium excretion is increased initially upon administration of methazolamide and in patients with cirrhosis or hepatic insufficiency could precipitate hepatic coma.In patients with pulmonary obstruction or emphysema, where alveolar ventilation may be impaired, methazolamide should be used with caution because it may precipitate or aggravate acidosis.. 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.Caution is advised for patients receiving high-dose aspirin and methazolamide concomitantly.. Laboratory Tests:. To monitor for hematologic reactions common to all sulfonamides, it is recommended that baseline CBC and platelet count be obtained on patients prior to initiating methazolamide therapy and at regular intervals during therapy. If significant changes occur, early discontinuance and institution of appropriate therapy are important. Periodic monitoring of serum electrolytes is also recommended.. Drug Interactions:. Methazolamide should be used with caution in patients on steroid therapy because of the potential for developing hypokalemia.Caution is advised for patients receiving high-dose aspirin and methazolamide concomitantly, as anorexia, tachypnea, lethargy, coma and death have been reported with concomitant use of high-dose aspirin and carbonic anhydrase inhibitors (see WARNINGS).. Carcinogenesis, Mutagenesis, Impairment of Fertility:. Long-term studies in animals to evaluate the carcinogenic potential of methazolamide and its effect on fertility have not been conducted. Methazolamide was not mutagenic in the Ames bacterial test.. Pregnancy:. Teratogenic effects.. Pregnancy Category C.. Methazolamide has been shown to be teratogenic (skeletal anomalies) in rats when given in doses approximately 40 times the human dose. There are no adequate and well controlled studies in pregnant women. Methazolamide should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.. Nursing Mothers:. It is not known whether this drug 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 methazolamide, decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.. Pediatric Use:. The safety and effectiveness of methazolamide in pediatric patients have not been established.

PREGNANCY SECTION.

Pregnancy:. Teratogenic effects.. Pregnancy Category C.. Methazolamide has been shown to be teratogenic (skeletal anomalies) in rats when given in doses approximately 40 times the human dose. There are no adequate and well controlled studies in pregnant women. Methazolamide should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

SPL UNCLASSIFIED SECTION.

Pregnancy Category C.. Methazolamide has been shown to be teratogenic (skeletal anomalies) in rats when given in doses approximately 40 times the human dose. There are no adequate and well controlled studies in pregnant women. Methazolamide should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

TERATOGENIC EFFECTS SECTION.

Teratogenic effects.

WARNINGS SECTION.

WARNINGS:. 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. Hypersensitivity reactions may recur when sulfonamide is readministered, irrespective of the route of administration.If hypersensitivity or other serious reactions occur, the use of this drug should be discontinued.Caution is advised for patients receiving high-dose aspirin and methazolamide concomitantly, as anorexia, tachypnea, lethargy, coma, and death have been reported with concomitant use of high-dose aspirin and carbonic anhydrase inhibitors.