pentobarbital will minimize the level or outcome of fentanyl intranasal by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Keep an eye on Closely. Coadministration of fentanyl with CYP3A4 inducers could lead on to a decrease in fentanyl plasma concentrations, lack of efficacy or, quite possibly, growth of the withdrawal syndro