Hydrochlorothiazide (HCTZ) is a prescription medication used to treat high blood pressure and fluid retention. Hydrochlorothiazide belongs to a group of drugs called diuretics ("water pills"), which help the body get rid of excess fluid.
This medication comes in tablet and capsule forms. Hydrochlorothiazide is usually taken once in the morning, with or without food.
Common side effects of hydrochlorothiazide include frequent urination, weakness, and dizziness. Do not drive or operate machinery until you know how hydrochlorothiazide will affect you.