Pentobarbital will lessen the extent or influence of gefitinib by influencing hepatic/intestinal enzyme CYP3A4 metabolism. pentobarbital will increase effects of ifosfamide by impacting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor. Coadministration of ifosfamide with CYP2B6 inducers might increase metabolism of ifosfamide to its metabolite. Watch for improved effects/toxiciti... https://danielb444cum5.muzwiki.com/user