Systemic exposure may be increased w/ inhibitors of hepatic uptake transporter OATP1B1 (eg, rifampin, cyclosporine) or hepatic efflux transporter MRP2 (eg, ritonavir). May increase serum K & creatinine (in heart failure patients) w/ other agents that block the renin-angiotensin system, K sparing diuretics (eg, spironolactone, triamterene, amiloride), K supplements, or K-containing salt substitutes. Renal function may deteriorate w/ NSAIDS in elderly, vol-depleted patients or those w/ compromised renal function. Antihypertensive effect may be attenuated w/ NSAIDS (eg, selective COX-2 inhibitors).