pentobarbital will reduce the extent or result of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Check.Monitor Intently (1)pentobarbital will reduce the level or influence of exemestane by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. For people receiving exemestane with a potent CYP3A4