Hydrochlorothiazide (brand names: Apo-Hydro / Aquazide H / Dichlotride / Hydrodiuril / Hydarazide / Microzide / Oretic / Moduretic / Inderide / Dyazide / Aldactazide / Aldoril), sometimes abbreviated HCT, HCTZ, or HZT is a popular diuretic drug (water pill) that acts by inhibiting the kidney's ability to retain water. This reduces the volume of the blood, decreasing blood return to the heart and thus cardiac output and, by other mechanisms, is believed to lower peripheral vascular resistance.
Hydrochlorothiazide is used to treat excessive fluid accumulation and swelling (edema) of the body caused by heart failure, cirrhosis, chronic kidney failure, corticosteroid medications, and nephrotic syndrome.
Hydrochlorothiazide is also used alone or in combination with other blood pressure lowering medications to treat high blood pressure.
This medicine is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.