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 (AT1angiotensin 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).