ANTIHISTAMINE

The physiological action of histamine,antihistamine is a group of reducing drugs that
prevent by competing at the places in the body where it normally acts. True antihistamine drugs are competitive inhibitors histamine action and have no visible cut action in an absence. These drugs perform differently to drugs such as epinephrine
that are able to play a part as antidotes to histamine by making opposite actions that
are physiological. Medicinally use of this synthetic drug is based upon the evidence that histamine causes many of the symptoms that cause various allergic disorders.
Actually normal histamine is present in tissues in a bound in physiological form that
is inactive. Only under certain conditions when it is released from the bound form that it exhibits toxicity. Therefore in various allergic conditions thee symptoms are
relieved by the synthetic drug that are really due to histamine that has been exited from its bound form in the tissues.The first synthetic drug to be used therapeutically
was antigen,and was introduced in 1942 in France. Later came a similar compound with lower toxicity, named Nero-antigen and was developed in the same country. 1945 phenhydramine an ethanol amine derivative was introduced in the united states and there after numerous synthetic drugs were then developed all with the same basic structure.All in all it is one in a group of antihistamine drugs used in the treatment
of allergic reactions as hay fever.

Learn more about this author, Erma Carbajal.
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