pentobarbital will lower the level or influence of ketoconazole by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Slight/Importance Unidentified.pentobarbital decreases amounts of toremifene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Keep an eye on. CYP3A4 inducers increase price of toremifene metabolism, loweri… Read More