Much better CYP3A4 inhibitors including ketoconazole or itraconazole may be expected to possess increased effects than found with saquinavir. A commencing dose of twenty five mg of VIAGRA need to be regarded in clients having erythromycin or robust CYP3A4 inhibitors (which include saquinavir, ketoconazole, itraconazole) [see DOSAGE AND ADMINISTRATI