Pentobarbital will reduce the extent or outcome of gefitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. pentobarbital will lower the extent or effect of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Watch. pentobarbital will minimize the extent or effect of theophylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caut... https://gallaghere443yoe1.blog5star.com/profile