Atacand Hct drug cures hypertension or high blood pressure. Controlling blood pressure helps prevent the occurrence of heart attacks, strokes, and kidney troubles. This drug contains both candesartan and hydrochlorothiazide. The former is a member of angiotensin receptor blockers class of drugs, which relaxes blood vessels, so it is easier for the blood to flow. The latter is a diuretic or a water pill, which increases the amount of urine the body makes and helps relax blood vessels for the blood to flow more easily.