antagonist

(redirected from H2 receptor antagonist)
Also found in: Dictionary, Thesaurus, Medical, Legal.
Related to H2 receptor antagonist: ranitidine, cimetidine, sucralfate, Proton pump inhibitors, H1 receptor antagonist

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 ?
Furthermore, H2 receptor antagonists increased the risk of nosocomial pneumonia, but only in this same subgroup receiving enteral nutrition.
H2 Receptor Antagonist Market Share by Drugs Classification in 2008
Acid-suppressing medications, including Proton pump inhibitors (PPI) and H2 receptor antagonists (H2RA), are among the most commonly used medications in developed countries.
Therapy with H2 receptor antagonists has not been consistently successful, as Manning reported failure of this approach to control a bleeding Meckel diverticulum.