Increased risk of hypotension, hyperkalemia, & changes in renal function in concomitant use w/ ACE inhibitors or aliskiren. Hypotension, vol-depleted patients, renal artery stenosis, renovascular HTN, renal & hepatic impairment, kidney transplantation, aortic & mitral valve stenosis, obstructive hypertrophic cardiomyopathy, primary aldosteronism, metabolic & endocrine effects, electrolyte imbalance, lithium, antidoping test. May impair ability to drive or operate machinery.