- No use of agents which may impair metabolism of aprepitant which include: Cisapride, macrolide antibiotics (Erythromycin, Clarithromycin, Azithromycin), azole antifungal agents (Ketoconazole, Itraconazole, Voriconazole, Fluconazole), Amifostine, Nelfinavir and Ritonavir.