ARB-thiazide diuretic combinations are used to treat high blood pressure. Some can also help lower the risk of stroke. The angiotensin II receptor blocker (ARB) helps relax blood vessels, while the thiazide diuretic helps your body get rid of extra salt and water. These medications are available in oral form. Examples include losartan/hydrochlorothiazide (Hyzaar), olmesartan/hydrochlorothiazide (Benicar HCT), valsartan/hydrochlorothiazide (Diovan HCT), telmisartan/hydrochlorothiazide (Micardis HCT).