pentobarbital will decrease the level or influence of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Keep an eye on.pentobarbital will lessen the extent or outcome of lapatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.pentobarbital will lessen the level or effect of lorlatinib by