Disartan (valsartan) is an angiotensin-II receptor antagonist (more commonly called an ARB, or angiotensin receptor blocker), with particularly high affinity for the type I (AT1) angiotensin receptor. By blocking the action of angiotensin, valsartan dilates blood vessels and reduces blood pressure.Valsartan is indicated for the treatment of high blood pressure,congestive heart failure (CHF), or post-myocardial infarction(MI).