Brand Name(s):Chlotride??Diuril??Aldochlor??(as a combination product containing Chlorothiazide, Methyldopa)Diupres??(as a combination product containing Chlorothiazide, Reserpine)WHY is this medicine prescribed?Chlorothiazide, a 'water pill,' is used to treat high blood pressure and fluid retention caused by various conditions, including heart disease.