Antihistamines

an·ti·his·ta·mine   (ān'tē-hĭs'tə-mēn', -mĭn, ān'tī-)    n.  A drug used to counteract the physiological effects of histamine production in allergic reactions and colds. an'ti·his'ta·min'ic (-mĭn'ĭk) adj.

antihistamines [(an-tee-his-tuh-meenz, an-tee-his-tuh-muhnz)]

Drugs that counteract the effects of a substance in the body called histamine. The body releases histamine, which causes many of the symptoms associated with allergies (sneezing, watery eyes, runny nose), in response to external agents such as pollen.

Main Entry: ²antihistamine
Function: noun
: any of various compounds that oppose the actions of histamine and are used especially for treating allergicreactions (as hay fever), cold symptoms, and motion sickness

antihistamine an·ti·his·ta·mine (ān'tē-hĭs'tə-mēn', -mĭn)
n.
Any of several drugs used to counteract the physiological effects of histamine.

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an'ti·his'ta·mine' adj.