A) antibiotics
B) histamines
C) antihistamines
D) none of the above.
Correct Answer: C
Solution :
: An antihistamine is a drug which serves to reduce or eliminate effects mediated by histamine, an endogenous chemical mediator released during allergic reactions, through action at the histamine receptor. Only agents where the main therapeutic effect is mediated by negative modulation of histamine receptors are termed antihistamines. Other agents may have antihistaminergic action but are not true antihistamines. In common use, the term antihistamine refers only to\[{{H}_{1}}-\]receptor antagonists, also known as Hi-antihistamines. It has been discovered that these\[{{H}_{1}}-\]antihistamines are actually inverse agonists at the histamine Hi-receptor, rather than antagonists per se.
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