pentobarbital will increase the level or influence of clopidogrel by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Use Warning/Watch.pentobarbital will minimize the extent or outcome of fentanyl transmucosal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Watch Carefully. Coadministration of fentanyl with CYP3A4 in