 - Patients must not be receiving any of the following for at least 24 hours prior to enrollment: atazanavir, clarithromycin, indinavir, itraconazole, ketoconazole, nefazodone, nelfinavir, ritonavir, saquinavir, telithromycin, troleandomycin TAO, voriconazole, rifampicin, rifabutin, rifapentine, phenytoin, carbamazepine, phenobarbital, or St. Johns Wort 