Diovan (valsartan) is an angiotensin II receptor blocker used to treat high blood pressure and heart failure. It works by blocking the action of angiotensin II, a substance in the body that causes blood vessels to constrict. By relaxing blood vessels, Diovan helps lower blood pressure and improve blood flow, reducing the workload on the heart. Clinical studies have shown that Diovan effectively lowers blood pressure, reduces the risk of heart-related complications, and improves overall heart function. It is commonly prescribed to manage hypertension and heart failure in adults.