noun \-ˈhis-tə-ˌmēn, -mən\

medical : a drug that is used to treat allergic reactions and colds

Full Definition of ANTIHISTAMINE

:  any of various compounds that counteract histamine in the body and that are used for treating allergic reactions (as hay fever) and cold symptoms
antihistamine adjective
an·ti·his·ta·min·ic \-ˌhis-tə-ˈmi-nik\ adjective or noun

First Known Use of ANTIHISTAMINE



noun    (Concise Encyclopedia)

Synthetic drug that counteracts the effects of released histamine in the body. Antihistamines compete with histamine at one of the three types of histamine receptors, preventing allergic attacks (see allergy) or inflammation. Some antihistamines also prevent motion sickness and vertigo. Drowsiness is a frequent side effect. H antihistamines, which bind to the second receptor type, are used to control gastric-acid secretion (see stomach) and treat peptic ulcers.


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