pentobarbital will decrease the extent or influence of phenytoin by affecting hepatic enzyme CYP2C9/ten metabolism. Use Caution/Keep an eye on.pentobarbital will lessen the level or influence of etonogestrel by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Keep an eye on.pentobarbital will lower the extent or effect of levamlod