 ketoconazole, itraconazole, troleandomycin, clarithromycin, erythromycin, ritonavir, indinavir, nelfinavir, saquinavir, amprenavir, nefazodone, fluvoxamine, diltiazem, verapamil, mibefradil, cimetidine, cyclosporine, and grapefruit juice. 