Fentanyl is a synthetic opioid drug, 50 to 100 times more potent than morphine. It is used in clinical settings for analgesia (pain relief) but also is a highly dangerous drug of abuse. It acts on opioid receptors in the brain to produce strong analgesic and euphoric effects, but its extreme potency greatly increases the risk of respiratory depression and fatal overdose, especially when misused or combined with other substances.
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