elranatamab will improve the amount or influence of fentanyl transdermal by influencing hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Keep track of. Elranatamab causes cytokine release syndrome (CRS) that could suppress action of CYP enzymes, leading to improved exposure of CYP substrates.brivaracetam and fentanyl transdermal the two max