Exforge HCT (generic: amlodipine/valsartan/hydrochlorothiazide) is a prescription medication used to treat high blood pressure. Exforge HCT is a single tablet containing 3 prescription medications: amlodipine, a calcium channel blocker, valsartan, an angiotensin receptor blocker, and hydrochlorothiazide, a diuretic (water pill). Exforge HCT can help your blood vessels relax, and decrease the amount of blood, so your blood pressure is lower.