Pentobarbital will minimize the extent or influence of montelukast by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Slight/Importance Unknown. Observe Intently (1)pentobarbital will lower the extent or outcome of fentanyl by impacting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Coadministration of fentanyl with CYP3A4 inducers may lead to the ... https://socialtechnet.com/story5320507/an-unbiased-view-of-order-nembutal-powder-online