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 ?
In the angiotensin II receptor antagonist medication class, Merck has been awarded the contract for its Cozaar(R) brand of losartan and Hyzaar(R) brand of losartan/hydrochlorothiazide.
There are three types of medications that can be employed in the treatment of addiction: aversive medications (Antabuse for alcohol use disorders); agonist medications for maintenance or withdrawal in opioid dependence treatment (methadone and buprenorphine); and antagonist medications that block the effects of the drug (Campral for alcohol dependence and naltrexone and Vivitrol for both alcohol and opioid use disorders).
POSSIBLE DRUG DRUG NAME INTERACTIONS Namenda[R] (memantine) Other NMDA antagonist medications, Blocks the toxic effects including amantadine, an antiviral used to associated with excess treat the flu, dextromethorphan, prescribed glutamate and regulates to relieve coughs due to colds or flu, and glutamate activation.