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Agonist

  1. A substance that acts at a neuronal receptor to produce effects similar to those of a reference drug; for example, methadone is a morphine-like agonist at the opioid receptors.

    See also: antagonist.

    Reference: World Health Organization. Lexicon of alcohol and drug terms published by the World Health Organization. Internet. Accessed August 20, 2009. Available at http://www.who.int/substance_abuse/terminology/who_lexicon/en/index.html


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