Valsartan (Diovan((R))) is a widely use angiotensin receptor blocker that prevents angiotensin II from binding to the subtype 1 receptor. Stimulation of the subtype 1 receptor is believed to mediate many of the deleterious effects accompanied by increased angiotensin II levels. Valsartan is effective in the treatment of hypertension, alone and in combination with hydrochlorothiazide. Valsartan is similarly as effective as angiotensin-converting enzyme (ACE) blockers following myocardial infarction accompanied with left ventricular dysfunction, and/or heart failure. For the treatment of congestive heart failure with left ventricular dysfunction, valsartan offers a reduction in mortality in patients not able to tolerate an ACE inhibitor and in combination with an ACE inhibitor, valsartan reduces morbidity (hospitalization for heart failure).