pentobarbital will lessen the level or result of nitrendipine by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Importance Unfamiliar.pentobarbital decreases levels of elvitegravir/cobicistat/emtricitabine/tenofovir DF by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. May perhaps produce lack of virologic re