antagonist

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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 ?
Beta-adrenergic antagonists, or beta-blockers, also might reduce stress-hormone-induced memory consolidation and fear conditioning by blocking postsynaptic norepinephrine receptors and impairing emotional memory, he said.
Patients had no history of esophageal varices, variceal bleeds, or treatment with beta-adrenergic antagonists prior to their index date.
Beta-adrenergic antagonists, more commonly known as beta blockers, are identified easily by the name ending olol.