Elderly, vol-depleted patients or w/ compromised renal function, co-administration of NSAIDs, including selective COX-2 inhibitors, w/ angiotensin II receptor antagonists (including azilsartan) may result in deterioration of renal function, including possible acute renal failure. Dual blockade of the renin angiotensin system w/ angiotensin receptor blockers, ACE inhibitors or aliskiren is associated w/ increased risks of hypotension, hyperkalemia & changes in renal function (including acute renal failure). Concomitant use w/ aliskiren. Reduced lithium clearance by diuretics eg, chlorthalidone increasing the risk of lithium toxicity.