Cavazide 150 mg is a fixed-dose combination tablet that combines Captopril and Hydrochlorothiazide to provide effective management of high blood pressure (hypertension) and heart failure. Captopril, an angiotensin-converting enzyme (ACE) inhibitor, helps relax blood vessels by inhibiting the conversion of angiotensin I to angiotensin II, while Hydrochlorothiazide, a thiazide diuretic, reduces fluid retention and lowers blood pressure by promoting the excretion of sodium and water.