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Observe Intently (one)phenobarbital will decrease the level or effect of fentanyl transmucosal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Keep track of Carefully. Coadministration of fentanyl with CYP3A4 inducers may lead to your lessen in fentanyl plasma concentrations, insufficient efficacy or, quite possibly, improv