Which of the following terms best describes a drug that blocks the action of adrenaline at its receptors by occupying those receptors without activating them?
Correct Answer: Pharmacologic antagonist
Description: * Pharmacological antagonist bind to same receptor and thus blocks the action of the drug e.g. atenolol (a beta receptor antagonist) is pharmacological antagonist of adrenaline. * Physiological antagonist binds to different receptor and produce opposite effect e.g. adrenaline produce bronchodilation by binding to beta 2 receptors whereas histamine cause bronchoconstriction by acting on H1 receptors. Thus adrenaline is physiological antagonist of histamine.
Category:
Pharmacology
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