tranylcypromine increases toxicity of fentanyl transdermal by Other (see remark). Contraindicated. Remark: Steer clear of fentanyl in people who require concomitant administration MAOIs, or inside 14 times of halting an MAOI. Critical and unpredictable potentiation by MAO inhibitors has long been claimed with opioid analgesics.fentanyl transdermal