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tranylcypromine boosts toxicity of fentanyl transdermal by Other (see remark). Contraindicated. Comment: Stay away from fentanyl in sufferers who need concomitant administration MAOIs, or in 14 times of stopping an MAOI. Serious and unpredictable potentiation by MAO inhibitors is noted with opioid analgesics.butorphanol decreases outcomes of fentan