What's a antihistamine? (sp?)?

What is a antihistamine and what does it do?What's a antihistamine? (sp?)?
An antihistamine is a drug which serves to reduce or exterminate effects mediated by histamine, an endogenous chemical diplomat released during allergic reactions, through handling at the histamine receptor. Only agents where the basic therapeutic effect is mediate by negative modulation of histamine receptors are term antihistamines - other agents may have antihistaminergic commotion but are not true antihistamines.
Histamine is a biogenic amine involved in local immune responses as economically as regulating physiological function in the gut and acting as a neurotransmitter.[1] New evidence also indicates that histamine plays a role contained by chemotaxis of white blood cells.
when your body react it produces histamine and antihistamine blocks the production of histamine.
In general, antihistamine is a class of drugs that will relief ease bad allergies, itch and flu. It depresses the brain function a little and the human being will feel drowsy from most of the antihistamine drugs. There are also some category of ppl who cannot take antihistamine, and a small minority who are will hold drug allergy reactions to antihistamines. For more information, you can consult your Medical Physician or refer to Merck Manual of drugs.
Benadryl (Decongestant Allergy) is one an antihistamine to be precise. My sister takes it for her allergies (runny snout & eyes). It makes her drowsy though but the runny eyes and proboscis stops.
Mostly runny nose. There are different types of Benadryl. Claritin is another antihistamine.
Sorry can't lend a hand you with the (sp?) what's up next to that?

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