CONCOMITANT ADMINISTRATION OF STRONG CYP3A4 INHIBITORS (E.G., KETOCONAZOLE, ITRACONAZOLE, NEFAZODONE, TROLEANDOMYCIN, CLARITHROMYCIN, RITONAVIR, AND NELFINAVIR. CONCOMITANT ADMINISTRATION OF POTASSIUM SUPPLEMENTS OR POTASSIUM-SPARING DIURETICS (E.G., AMILORIDE, SPIRONOLACTONE, OR TRIAMTERENE. SERUM LITHIUM LEVELS SHOULD BE MONITORED FREQUENTLY IF EPLERENONE IS ADMINISTERED CONCOMITANTLY WITH LITHIUM.