pentobarbital will lessen the level or effect of etravirine by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.pentobarbital will lessen the level or result of theophylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Watch.pentobarbital will lower the level or effect of pazopanib by affecting h