On average, hydrochlorothiazide (HCTZ) lowers systolic blood pressure (top number) by about 8 mm Hg. It lowers diastolic blood pressure (bottom number) by about 8 mm Hg. This is based on a common dosage of 25 mg daily.
Remember that this is just an average. Your blood pressure may go down more or less than this.
Keeping both numbers down is important, because high blood pressure can damage your heart, brain, and kidneys. Lowering your blood pressure may lower your chances of heart disease, heart attack, stroke, kidney damage, and death.
HCTZ is one of the medicines your doctor may recommend to treat high blood pressure.
Less Pressure, More Health!