Patients w/ aortic & mitral stenosis, or obstructive hypertrophic cardiomyopathy; pre-existing renal dysfunction or those w/ severe cardiac insufficiency; mild to moderate non-cholestatic hepatic impairment; heart failure. Evaluate renal function in post-MI patients. Correct Na &/or vol depletion prior to treatment initiation. Concurrent use of K supplements, K-sparing diuretics, K-containing salt substitutes or other medicinal products that may increase K levels (eg, heparin); frequently monitor K levels. Concurrent use w/ captopril is not recommended. Dual blockade of renin-angiotensin-aldosterone system through the combined use of ACE inhibitors, ARBs or aliskiren is not recommended. Should not be used in patients w/ primary hyperaldosteronism. Safety of valsartan use in patients w/ bilateral renal artery stenosis or stenosis to a solitary kidney has not been demonstrated. No experience w/ respect to safety of valsartan use in patients after recent kidney transplantation. May affect ability to drive & use machines. Not recommended during 1st trimester of pregnancy. Lactating mothers should not breastfeed while on treatment. Not recommended for use in childn <18 yr.