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Methorphan is an opioid drug that occurs in two isomeric forms, each with differing pharmacology and effects:Dextromethorphan – An over-the-counter cough suppressant, as well as dissociative hallucinogen. Levomethorphan – A potent opioid analgesic that was never clinically developed; a prodrug of the powerful opioid agonist analgesic levorphanol (Levo-Dromoran).
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