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More powerful CYP3A4 inhibitors including ketoconazole or itraconazole may very well be envisioned to have larger consequences than witnessed with saquinavir. A beginning dose of twenty five mg of VIAGRA really should be regarded in sufferers taking erythromycin or sturdy CYP3A4 inhibitors (which include saquinavir, ketoconazole, itraconazole) [see