Potential interaction w/ fluconazole, rifampicin, barbiturates, phenytoin, St. John's wort, quinidine, disopyramide, ibutilide, sotalol, amiodarone, bepridil, pimozide, ziprasidone, sertindole, mefloquine, halofantrine, IV erythromycin, pentamidine, cisapride, furosemide, hydrochlorothiazide, indapamide. Increased exposure w/ grapefruit juice.