pentobarbital will reduce the level or outcome of etoposide by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.pentobarbital will lessen the level or impact of etonogestrel by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Observe.pentobarbital will decrease the extent or influence of bosentan by i