Pentobarbital will decrease the level or outcome of ritonavir by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Check. pentobarbital will lower the level or influence of tamoxifen by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Observe. pentobarbital will lower the level or effect of rabeprazole by impacting hepatic/intestinal enzyme CYP3A4 ... https://ricardopkcpe.thenerdsblog.com/36705224/indicators-on-what-kind-of-drug-is-nembutal-you-should-know