Question

Antihistamines are only for H2 receptor antagonists.

(a) True

(b) False

This question was addressed to me in quiz.

Origin of the question is Drug Concentration and Pharmacologic Response in portion Applications of Pharmacokinetic Principles, Diuretics, Drug Concentration and Pharmacologic Response of Drug Biotechnology

Answer 1

The correct choice is (b) False

To explain I would say: A drug that reduces or eliminates the effects mediated by the chemical histamine. True antihistamines are only the agents that produce a therapeutic effect that is mediated by negative modulation of histamine receptors. The term antihistamine only refers to H1 receptor antagonists. Antihistamines compete with histamine for binding sites at the receptors. Antihistamine cannot remove the histamine if it is already bound.