METOPROLOL TARTRATE AND HYDROCHLOROTHIAZIDE

Metoprolol tartrate and hydrochlorothiazide tablets, USP has the antihypertensive effect of metoprolol tartrate, a beta adrenoreceptor blocker, and hydrochlorothiazide, a thiazide diruetic. It is available as tablets for oral administration. The 50/25 tablets contain 50 mg of metoprolol tartrate USP and 25 mg of hydrochlorothiazide USP and the 100/25 tablets contain 100 mg of metoprolol tartrate USP and 25 mg of hydrochlorothiazide USP. Metoprolol tartrate USP is (±)-1- (Isopropylamino)-3-[ p -(2-methoxyethyl)phenoxy]-2-propanol L-(+)-tartrate (2:1) salt, and its structural formula is Metoprolol tartrate USP is a white, crystalline powder. It is very soluble in water; freely soluble in methylene chloride, in chloroform, and in ethanol (96 percent); slightly soluble in acetone; and insoluble in ether. Its molecular weight is 684.82. Hydrochlorothiazide is 6-chloro-3, 4-dihydro-2 H -1,2,4-benzothiadiazine-7- sulfonamide 1,1- dioxide, and its structural formula is Hydrochlorothiazide USP is a white, or practically white, practically odorless, crystalline powder. It is freely soluble in sodium hydroxide solution, in n -butylamine, and in dimethylformamide; sparingly soluble in methanol; slightly soluble in water; and insoluble in ether, in chloroform, and in dilute mineral acids. Its molecular weight is 297.73. Inactive Ingredients: colloidal silicon dioxide, magnesium stearate, microcrystalline cellulose, sodium starch glycolate, povidone, lactose monohydrate, powdered cellulose. Image hctz

Metoprolol tartrate and hydrochlorothiazide tablets is indicated for the treatment of hypertension, to lower blood pressure. Lowering blood pressure lowers the risk of fatal and non-fatal cardiovascular events, primarily strokes and myocardial infarctions. These benefits have been seen in controlled trials of antihypertensive drugs from a wide variety of pharmacologic classes including metoprolol. Control of high blood pressure should be part of comprehensive cardiovascular risk management, including, as appropriate, lipid control, diabetes management, antithrombotic therapy, smoking cessation, exercise, and limited sodium intake. Many patients will require more than 1 drug to achieve blood pressure goals. For specific advice on goals and management, see published guidelines, such as those of the National High Blood Pressure Education Program's Joint National Committee on Prevention, Detection, Evaluation, and Treatment of High Blood Pressure (JNC). Numerous antihypertensive drugs, from a variety of pharmacologic classes and with different mechanisms of action, have been shown in randomized controlled trials to reduce cardiovascular morbidity and mortality, and it can be concluded that it is blood pressure reduction, and not some other pharmacologic property of the drugs, that is largely responsible for those benefits. The largest and most consistent cardiovascular outcome benefit has been a reduction in the risk of stroke, but reductions in myocardial infarction and cardiovascular mortality also have been seen regularly. Elevated systolic or diastolic pressure causes increased cardiovascular risk, and the absolute risk increase per mmHg is greater at higher blood pressures, so that even modest reductions of severe hypertension can provide substantial benefit. Relative risk reduction from blood pressure reduction is similar across populations with varying absolute risk, so the absolute benefit is greater in patients who are at higher risk independent of their hypertension (for example, patients with diabetes or hyperlipidemia), and such patients would be expected to benefit from more aggressive treatment to a lower blood pressure goal. Some antihypertensive drugs have smaller blood pressure effects (as monotherapy) in black patients, and many antihypertensive drugs have additional approved indications and effects (eg, on angina, heart failure, or diabetic kidney disease). These considerations may guide selection of therapy. Metoprolol tartrate and hydrochlorothiazide tablets may be administered with other antihypertensive agents. Limitation of Use Metoprolol tartrate and hydrochlorothiazide tablets is not indicated for initial therapy of hypertension. If the fixed combination represents the dose titrated to the individual patient's needs, therapy with the fixed combination may be more convenient than with the separate components. Metoprolol tartrate and hydrochlorothiazide tablet is the combination tablet of metoprolol tartrate, a beta adrenoceptor blocker and hydrochlorothiazide (HCTZ), a thiazide diuretic, indicated for the treatment of hypertension, to lower blood pressure. Lowering blood pressure reduces the risk of fatal and nonfatal cardiovascular events, primarily strokes and myocardial infarctions. ( 1 )

Usual dose range: Hydrochlorothiazide 12.5 to 25 mg and metoprolol tartrate 100 mg dosed once daily. ( 2.1 ) 2.1 Recommended Dosage Titrate doses of individual components before switching to metoprolol tartrate and hydrochlorothiazide tablets. Administer metoprolol tartrate and hydrochlorothiazide tablets with or immediately following meals. Hydrochlorothiazide is usually given at a dosage of 12.5 mg to 50 mg per day. The usual initial dosage of metoprolol is 100 mg daily in single or divided doses. Dosage may be increased gradually until optimum blood pressure control is achieved. Once daily dosing may not maintain the full effect for the entire dosing period, particularly at lower doses. In such patients, consider administration in divided doses. Dosing regimens that exceed 50 mg of hydrochlorothiazide per day are not recommended.

Metoprolol tartrate and hydrochlorothiazide tablets is contraindicated in patients with: Cardiogenic shock or decompensated heart failure . Sinus bradycardia, sick sinus syndrome, and greater than first-degree block unless a permanent pacemaker is in place . Anuria Hypersensitivity to metoprolol tartrate or hydrochlorothiazide or to other sulfonamide- derived drugs. Hypersensitivity to metoprolol tartrate or hydrochlorothiazide or other sulfonamide-derived drugs. ( 4 ) Cardiogenic shock or decompensated heart failure. ( 4 ) Sinus bradycardia, sick sinus syndrome, and greater than first-degree block unless a permanent pacemaker is in place. ( 4 ) Anuria. ( 4 )

The following adverse reactions are described in more detail elsewhere in the label; Worsening angina or myocardial infarction [see Warnings and Precautions ( 5 )] Worsening heart failure [see Warnings and Precautions ( 5 )] Worsening AV block [see Contraindications ( 4 )] To report SUSPECTED ADVERSE REACTIONS, contact Ajanta Pharma USA Inc. at 1-855-664-7744 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.2 Post-Marketing Experience The following adverse reactions have been reported in postmarketing experience: adverse reactions have been identified during post approval use of metoprolol tartrate and hydrochlorothiazide tablets. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Metoprolol Confusional state, an increase in blood triglycerides and a decrease in High Density Lipoprotein (HDL). Very rare reports of hepatitis, jaundice and non-specific hepatic dysfunction. Isolated cases of transaminase, alkaline phosphatase, and lactic dehydrogenase elevations have also been reported. Hydrochlorothiazide Digestive: Pancreatitis, jaundice (intrahepatic cholestatic), sialadenitis, vomiting, diarrhea, cramping, nausea, gastric irritation, constipation, anorexia. Cardiovascular: Orthostatic hypotension (may be potentiated by alcohol, barbiturates, or narcotics). Neurologic: Vertigo, dizziness, transient blurred vision, headache, paresthesia, xanthopsia, weakness, restlessness. Musculoskeletal: Muscle spasm. Hematologic: Aplastic anemia, agranulocytosis, leukopenia, thrombocytopenia. Metabolic: Hyperglycemia, glycosuria, hyperuricemia. Hypersensitive Reactions: Necrotizing angiitis, Stevens-Johnson syndrome, respiratory distress including pneumonitis and pulmonary edema, purpura, urticaria, rash, photosensitivity. Other beta-adrenergic agent reactions A variety of adverse reactions have been reported with other beta-adrenergic blocking agents and should be considered potential adverse reactions to metoprolol tartrate. Central Nervous System: Reversible mental depression progressing to catatonia; visual disturbances; hallucinations; an acute reversible syndrome characterized by disorientation for time and place, emotional lability, clouded sensorium, and decreased performance on neuropsychometrics. Hematologic: Agranulocytosis, nonthrombocytopenic purpura, thrombocytopenic purpura. Hypersensitive Reactions: Laryngospasm and respiratory distress.

Catecholamine-depleting drugs (e.g., MAO inhibitors): Hypotension, bradycardia. ( 7.1 ) CYP2D6 inhibitors: Increased metoprolol concentration. ( 12.3 ) Digitalis glycosides, clonidine, diltiazem and verapamil: Bradycardia. ( 5.4 , 7.1 ) Clonidine: Rebound hypertension following clonidine withdrawal. ( 7.1 ) Antidiabetic drugs: Dosage adjustment may be required. ( 7.2 ) Cholestyramine and colestipol: Reduced absorption of thiazides. ( 7.2 ) Lithium: Risk of lithium toxicity. ( 7.2 ) Non-Steroidal Anti-Inflammatory Drugs (NSAIDs): Reduced diuretic, natriuretic, and antihypertensive effects of diuretics. ( 7.2 ) 7.1 Drug Interactions with Metoprolol Catecholamine Depleting Drugs: The concomitant use of catecholamine-depleting drugs (e.g., reserpine, monoamine oxidase (MAO) inhibitors) with beta adrenergic blockers may have an additive affect and increase the risk of hypotension or bradycardia CYP2D6 Inhibitors: Drugs that are strong inhibitors of CYP2D6 such as quinidine, fluoxetine, paroxetine, and propafenone were shown to double metoprolol concentrations. While there is no information about moderate or weak inhibitors, these too are likely to increase metoprolol concentration. Increases in plasma concentration decrease the cardioselectivity of metoprolol [see Clinical Pharmacology ( 12.3 )] . Monitor patients closely when the combination cannot be avoided. Digitalis, Clonidine, and Calcium Channel Blockers: Digitalis glycosides, clonidine, diltiazem and verapamil slow atrioventricular conduction and decrease heart rate. Concomitant use with beta blockers can increase the risk of bradycardia. If clonidine and a beta blocker, such as metoprolol are coadministered, withdraw the beta- blocker several days before the gradual withdrawal of clonidine because beta-blockers may exacerbate the rebound hypertension that can follow the withdrawal of clonidine. If replacing clonidine by beta-blocker therapy, delay the introduction of beta-blockers for several days after clonidine administration has stopped. 7.2 Drug Interactions with Hydrochlorothiazide Antidiabetic drugs (oral agents and insulin) : Dosage adjustment of the antidiabetic drug may be required. Ion exchange resins: Absorption of hydrochlorothiazide is impaired in the presence of anionic exchange resins. Single doses of either cholestyramine or colestipol resins bind the hydrochlorothiazide and reduce its absorption from the gastrointestinal tract by up to 85% and 43%, respectively. Stagger the dosage of hydrochlorothiazide and ion exchange resins ( e.g., cholestyramine and colestipol resins ) such that hydrochlorothiazide is administered at least 4 hours before or 4-6 hours after the administration of resins to minimize the interaction. Lithium : Diuretics reduce the renal clearance of lithium and increase the risk of lithium toxicity. Monitor serum lithium concentrations during concurrent use. Non-Steroidal Anti-Inflammatory Drugs : NSAIDs can reduce the diuretic, natriuretic, and antihypertensive effects of thiazide diuretics.