Much better CYP3A4 inhibitors like ketoconazole or itraconazole could be envisioned to obtain increased outcomes than viewed with saquinavir. A starting dose of twenty five mg of VIAGRA really should be thought of in clients getting erythromycin or solid CYP3A4 inhibitors (like saquinavir, ketoconazole, itraconazole) [see DOSAGE AND ADMINISTRATION,