pentobarbital will decrease the level or influence of bosentan by affecting hepatic enzyme CYP2C9/ten metabolism. Slight/Importance Unidentified.pentobarbital will minimize the level or influence of tolterodine by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Watch.Monoamine oxidase inhibitors (MAOI): MAOI prolong the consequ