Using CYP3A4 inhibitors such as Ketoconazole, Ritonavir, Itraconazole, Erythromycin, Clarithromycin, Nelfinavir, Fluconazole, Amiodarone, Cyclosporine, Diltiazem, nefazadone,fluvoxamine, verapamil, chloramphenicol, Indinavir or saquinavir within 7 days of treatment.