Stronger CYP3A4 inhibitors for instance ketoconazole or itraconazole could possibly be envisioned to obtain increased consequences than noticed with saquinavir. A commencing dose of twenty five mg of VIAGRA must be viewed as in clients taking erythromycin or potent CYP3A4 inhibitors (for instance saquinavir, ketoconazole, itraconazole) [see DOSAGE