 - Patients taking concurrent medications of any kind which are strong inducers or inhibitors of CYP3A4. Patients receiving any of the following will be excluded: ketoconazole, itraconazole, clarithromycin, atazanavir, indinavir, nefazodone, nelfinavir, ritonavir, saquinavir, telithromycin, voriconazole, dexamethasone, phenytoin, carbamazepine, rifampin, rifabutin, rifapentin, phenobarbital, St. Johns Wort. 