Increased bioavailability w/ grapefruit juice. Reduced levels w/ barbiturates, carbamazepine, oxcarbazepine, phenytoin, nafcillin, sulfadimidine IV, rifampicin, octreotide, probucol, orlistat, Hypericum (St. John's wort) prep, ticlopidine, sulfinpyrazone, terbinafine, bosentan. Increased levels w/ chloroquine, macrolide antibiotics (eg, erythromycin, azithromycin & clarithromycin), ketoconazole, fluconazole, itraconazole, voriconazole, diltiazem, nicardipine, verapamil, metoclopramide, OCs, danazol, high-dose methylprednisolone, allopurinol, amiodarone, cholic acid & derivatives, PIs, imatinib, colchicine, nefazodone. Synergistic interaction w/ other medicines causing nephrotoxicity eg, aminoglycosides (including gentamicin & tobramycin), amphotericin B, ciprofloxacin, vancomycin, trimethoprim (+ sulfamethoxazole), NSAIDs (including diclofenac, indometacin, naproxen & sulindac), melphalan, histamine H
2-receptor antagonists (eg, cimetidine, ranitidine), MTX, tacrolimus. Increased incidence of gingival hyperplasia w/ nifedipine. Increased AUC of ciclosporin & lercanidipine following co-administration. Significantly increased bioavailability of diclofenac. May reduce clearance of digoxin, colchicine, prednisolone, HMG-CoA reductase inhibitors (statins), etoposide, aliskiren, bosentan or dabigatran. Severe digitalis intoxication w/ digoxin. Potential to potentiate toxic effects of colchicine. Significantly increased exposure to anthracycline antibiotics (eg, doxorubicine, mitoxanthrone, daunorubicine). Cases of myotoxicity, myositis & rhabdomyolysis w/ lovastatin, simvastatin, atorvastatin, pravastatin & fluvastatin. Elevated serum creatinine w/ everolimus or sirolimus. Significantly increased blood levels of everolimus & sirolimus. Significantly increased serum K w/ K-sparing drugs (eg, K-sparing diuretics, ACE inhibitors, AIIAs) or K-containing medicines. May raise plasma levels of repaglinide. Decreased levels w/ bosentan. Increased exposure of bosentan. Increased C
max & AUC of aliskiren. Increased plasma conc of dabigatran. Increased exposure of ciclosporin & ambrisentan following co-administration.