 9. Patients being treated with drugs recognized as strong inhibitors or inducers of the isoenzyme CYP3A including, but not limited, to - see table 6 - Rifabutin, Rifampicin, Clarithromycin, Ketoconazole, Itraconazole, Voriconazole, Ritonavir, Telithromycin continuously for at least 7 days during any time period in the last 2 weeks prior to randomization. 