antagonist

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Related to antagonist medication: Partial agonist

antagonist

1. any muscle that opposes the action of another
2. a drug that counteracts the effects of another drug

antagonist

[an′tag·ə‚nist]
(biochemistry)
A molecule that bears sufficient structural similarity to a second molecule to compete with that molecule for binding sites on a third molecule.
(pharmacology)
A drug or other chemical substance capable of reducing the physiological activity of another chemical substance; refers especially to a drug that opposes the action of a drug or other chemical substance on the nervous system by combining with and blocking the nerve receptor.
(physiology)
A muscle that contracts with, and limits the action of, another muscle, called an agonist, with which it is paired.
References in periodicals archive ?
The answer seems to be related to the persistent belief that the use of pharmacotherapy in recovery renders the user "still addicted"; the lack of belief in the efficacy of these drugs, including a lack of commitment by senior administrative and clinical staff; the belief that pharmacotherapy is intended to replace rather than augment psychosocial treatments; the notion that these drugs are incompatible with AA or Narcotics Anonymous (NA); the fact that antagonist medications are psychoactive or addictive; and the slow acceptance of change in general in this field.