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Watch Intently (one)phenobarbital will lessen the extent or influence of fentanyl transmucosal by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Observe Intently. Coadministration of fentanyl with CYP3A4 inducers could lead on to the decrease in fentanyl plasma concentrations, lack of efficacy or, probably, advancement of a