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DESCRIPTION Captopril and hydrochlorothiazide tablets, USP for oral administration combines two antihypertensive agents: captopril and hydrochlorothiazide. Captopril, the first of a new class of antihypertensive agents, is a specific competitive inhibitor of angiotensin I-converting enzyme (ACE), the enzyme responsible for the conversion of angiotensin I to angiotensin II. Hydrochlorothiazide is a benzothiadiazide (thiazide) diuretic-antihypertensive. Captopril, USP is a white to off-white crystalline powder with characteristic sulfide-like odor; it is freely soluble in water, ethanol, methanol, chloroform, isopropyl alcohol and methylene chloride and soluble in ethyl acetate. It dissolves in dilute solution of alkali hydroxide. Hydrochlorothiazide, USP is a white or almost white, almost odorless crystalline powder. Very slightly soluble in water, sparingly soluble in Ethanol and Methanol, soluble in Acetone. Freely soluble in N,N-Dimethylformamide, in n-Butylamine and in diluted solutions of alkali hydroxides. Practically insoluble in Ether, in Chloroform and in diluted mineral acids. Captopril is designated chemically as 1-[(2S)-3-Mercapto-2-methylpropionyl]-L-proline; Hydrochlorothiazide is 6-Chloro-3,4-dihydro-2 H -1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide. Their structural formulas are: Captopril and hydrochlorothiazide tablets are available for oral administration in four combinations of captopril with hydrochlorothiazide: 25 mg with 15 mg, 25 mg with 25 mg, 50 mg with 15 mg, and 50 mg with 25 mg. In addition, each tablet contains the following inactive ingredients: anhydrous lactose, colloidal silicon dioxide, croscarmellose sodium, magnesium stearate, microcrystalline cellulose, pregelatinized starch (corn) and sodium lauryl sulfate. The 25 mg/25 mg and 50 mg/25 mg tablets also contain FD&C Yellow No. 6 Aluminum Lake. captopril-struct