pentobarbital will lessen the level or effect of montelukast by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.Contraindicated (one)pentobarbital will lessen the extent or effect of elbasvir/grazoprevir by affecting hepatic/intestinal enzyme CYP3A4 metabolism.pentobarbital will lessen the level or impact of keto