pentobarbital will reduce the level or outcome of darifenacin by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Check.pentobarbital will decrease the extent or result of bortezomib by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Keep an eye on.pentobarbital will lower the level or effect of carbamazepine