Concomitant use with CYP3A4 Inhibitors (e.g. ketoconazole, voriconazole, itraconazole, fluconazole, clarithromycin, diltiazem saquinavir, verpamil, ritonavir) may increase serum concentrations of Eplerenone. CYP3A4 inducers (e.g. rifampicin, carbamazepine, phenytoin, phenobarbital) may decrease Eplerenone efficacy. Eplerenone may enhance hyperkalaemic effect of ACE inhibitors, angiotensin II receptor blockers, potassium-sparing diuretics or potassium salts.
Concomitant use with diazoxide, MAOIs, pentoxifylline, prostacyclin analogues may enhance hypotensive effect of antihypertensives.
NSAIDs may possibly reduce the antihypertensive and/or diuretic effects of potassium-sparing diuretics and may increase risk of hyperkalaemia. Lithium toxicity has been reported when used with ACE inhibitors or diuretics; monitor lithium levels when used with Eplerenone.