Important Warning: Do not take losartan and hydrochlorothiazide if you are pregnant or breast-feeding. If you become pregnant while taking losartan and hydrochlorothiazide, call your doctor immediately.

The combination of losartan and hydrochlorothiazide is used to treat high blood pressure. It blocks the action of certain chemicals that tighten the blood vessels so blood flows more smoothly. It also causes the kidneys to get rid of unneeded water and salt from the body into the urine.

This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

For more information on Hyzaar (Losartan Potassium + HCT), click here.