pentobarbital will lessen the level or effect of darifenacin by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Check.pentobarbital will lower the level or outcome of tipranavir by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Monitor.pentobarbital will lessen the level or result of cannabidiol by affecti