Hydrochlorothiazide is a thiazide diuretic (water pill) that helps prevent your body from absorbing too much salt, which can cause fluid retention. Captopril is in a group of drugs called ACE inhibitors. ACE stands for angiotensin converting enzyme. Captopril lowers blood pressure and also relieves symptoms of fluid retention. Hydrochlorothiazide and captopril is a combination medicine used to treat hypertension (high blood pressure).
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