pentobarbital will minimize the level or result of ethotoin by impacting hepatic enzyme CYP2C9/ten metabolism. Use Caution/Monitor.pentobarbital will minimize the extent or outcome of bexarotene by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Keep an eye on.pentobarbital increases toxicity of ifosfamide by influencing hepatic/