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BookmarkAn 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..
For more information about the topic Antihistamine, read the full article at Wikipedia.org, or see the following related articles:
Histamine — Histamine is a biogenic amine chemical involved in local immune responses as well as regulating physiological function in the gut and acting as a ... > read more
Itch — An itch is a sensation felt on an area of skin that causes a person or animal to desire to scratch that area. It is a distressing symptom that can ... > read more
Hay fever — Allergic rhinitis, also called pollinosis, hay fever or nasal allergies, and often also written together as hayfever, is a collection of symptoms, ... > read more
Nasal congestion — Nasal congestion is the blockage of the nasal passages usually due to excessive secretion of mucus that is caused by a virus and typically resolves ... > read more
Note: This page refers to an article that is licensed under the GNU Free Documentation License. It uses material from the article Antihistamine at Wikipedia.org. See the Wikipedia copyright page for more details.
