Co-Diovan 160/12.5mg is a prescription medication containing valsartan and hydrochlorothiazide used to treat essential hypertension (high blood pressure) in adults. Each pack contains 28 film-coated tablets manufactured by Novartis for oral administration. Each film-coated tablet contains 160mg of valsartan (an angiotensin II receptor blocker) and 12.5mg of hydrochlorothiazide (a diuretic). Valsartan works by blocking the action of angiotensin II, helping blood vessels relax and widen. Hydrochlorothiazide helps remove excess fluid from the body. The combination of these two medications effectively helps lower blood pressure. The tablets should be taken as prescribed by your healthcare provider. This medication requires a prescription and should be stored at room temperature away from moisture and heat.