More powerful CYP3A4 inhibitors like ketoconazole or itraconazole can be predicted to have increased consequences than observed with saquinavir. A setting up dose of 25 mg of VIAGRA must be thought of in individuals using erythromycin or solid CYP3A4 inhibitors (such as saquinavir, ketoconazole, itraconazole) [see DOSAGE AND ADMINISTRATION, CLINICA