CAPOZIDE® (captopril and hydrochlorothiazide tablets, USP) for oral administration combines two antihypertensive agents: CAPOTEN^Ò (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. CAPOZIDE^Ò tablets are available 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. Inactive ingredients: microcrystalline cellulose, colorant (FD&C Yellow No. 6), lactose, magnesium stearate, pregelatinized starch, and stearic acid.

Captopril is designated chemically as 1-[(2S)-3-mercapto-2-methylpropionyl]-L-proline; hydrochlorothiazide is 6-Chloro-3,4-dihydro-2H-1,2,4-benzothiadiazine-7-sulfonamide 1,1-dioxide. Graphic formulas:

[MW 217.29] captopril	[MW 297.73] hydrochlorothiazide

Captopril is a white to off-white crystalline powder that may have a slight sulfurous odor; it is soluble in water (approx. 160 mg/mL), methanol, and ethanol and sparingly soluble in chloroform and ethyl acetate.

Hydrochlorothiazide is a white crystalline powder slightly soluble in water but freely soluble in sodium hydroxide solution.

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