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Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)



 This fixed-combination drug is not indicated for initial therapy of hypertension. Hypertension requires therapy titrated to the individual patient. If the fixed combination represents the dosage so determined, its use may be more convenient in patient management. The treatment of hypertension is not static but must be reevaluated as conditions in each patient warrant.

Hydralazine HCI and hydrochlorothiazide is an antihypertensive-diuretic combination available as capsules for oral administration. Hydralazine HCI and hydrochlorothiazide capsules of 25 mg /25 mg contain 25 mg of hydralazine hydrochloride USP and 25 mg of hydrochlorothiazide USP; capsules of 50 mg /50 mg contain 50 mg of hydralazine hydrochloride USP and 50 mg of hydrochlorothiazide USP; and capsules of 100 mg /50 mg contain 100 mg of hydralazine hydrochloride USP and 50 mg of hydrochlorothiazide USP.

Each tablet also contains the following inactive ingredients: Corn starch, crospovidone, gelatin, lactose monohydrate, pharmaceutical glaze, sodium starch glycolate, stearic acid, talc, and titanium dioxide. In addition, the 25 mg/25 mg capsule contains ammonium hydroxide, ethylene glycol monoethyl ether, propylene glycol and synthetic black iron oxide; the 50 mg/50 mg capsule contains FD&C Blue #1, FD&C Red #40, FD&C Yellow #6, synthetic red iron oxide and pharmaceutical shellac; and the 100 mg/50 mg capsule contains D&C Red #28, D&C Yellow #10, FD&C Blue #1, FD&C Blue #2, FD&C Red #40, propylene glycol and synthetic black iron oxide. Hydralazine hydrochloride is 1 hydrazinophthalazine monohydrochloride.

Hydralazine hydrochloride USP is a white to off-white, odorless crystalline powder. It is soluble in water, slightly soluble in alcohol, and very slightly soluble in ether. It melts at about 275° C with decomposition, and has a molecular weight of 196.64. Hydrochlorothiazide is 6-chloro-3,4-dihydro-2H -1,2.4-benzothiadiazine-7-sulfonamide 1 ,1 -dioxide. Chemical structure is as follows:

Hydrochlorothiazide USP is a white, or practically white, practically odorless crystalline powder. It is freely soluble in sodium hydroxide solution, in 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 297.75. Chemical structure is as follows:

Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.

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