antagonist

(redirected from H2-Receptor 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 ?
The results suggest that in such patients prescribed a PPI for prophylaxis or for reflux symptoms, an alternative gastroprotective drug should be considered, such as a histamine H2-receptor antagonist, sucralfate, or misoprostol, said Dr.
Treatment of reflux oesophagitis resistant to H2-receptor antagonists.
today announced positive preclinical results from the application of its nitric oxide (NO)- enhancing technology to two commonly prescribed classes of ulcer medicines, H2-Receptor antagonists and proton pump inhibitors.