More robust CYP3A4 inhibitors like ketoconazole or itraconazole might be envisioned to own better consequences than witnessed with saquinavir. A beginning dose of twenty five mg of VIAGRA needs to be thought of in people using erythromycin or strong CYP3A4 inhibitors (for example saquinavir, ketoconazole, itraconazole) [see DOSAGE AND ADMINISTRATIO