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biological

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nalmefene

nalmefene Nalmefene is a small-molecule mu opioid receptor antagonist that is used as an antidote for fentanyl and related opioid overdose.

Nalmefene is a small-molecule mu opioid receptor antagonist that is used as an antidote for fentanyl and related opioid overdose. It is structurally similar to naloxone but has a much longer elimination half-life in humans, about 11 hours, which may help extend reversal of opioid effects.