pentobarbital will lower the level or result of triazolam by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Monitor.pentobarbital decreases levels of elvitegravir/cobicistat/emtricitabine/tenofovir DF by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Contraindicated. May bring on loss of virologic response and achievable