Pentobarbital will lower the level or result of nitrendipine by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Insignificant/Importance Not known. pentobarbital will decrease the extent or impact of tamoxifen by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Watch. pentobarbital will decrease the extent or influence of sulfamethoxazole by influencing hepa... https://mikeu210kuc0.wikifrontier.com/user