HISTAMINE RECEPTOR BLOCKERS ::
Histamine receptore blockers are H1 receptor blcokers (commonly known as antihistamines ) or H2-receptor blockers (commonly known as antisecretary drugs) H3- receptor blockers may also be there
H1 receptor -antagonists ::
They can be classified according to their chemical nature as follows ::
Ethanolamines e.g. Diphenhydramine
Bromodiphenhydramine
Doxylamine
Dimenhydrinate
Carbinoxamine
Ethylenediamines e.g. Mepyramine maleate
Tripelennamine
Pyrilamine maleate
Methapyrilene
Alkylamines e.g. Chlorpheniramine maleate
Bromopheniramine
Dimethindine
Acrivastine
Piperazines e.g. Meclizine
Cyclizine
Chlorcyclizine
Hydroxyzine
Phenothiazines e.g. Promethazine
Trimeprazine
Methidilazine
Aniline derivatives e.g. Antergan
Antazoline
Thenalididine
Piperidines e.g. Terfenadine
Fexofenadine
Phenindamine
Cyproheptadine
Levocabastine
Loratidine
Hydroxyzine e.g. Cetrizine
Miscellaneous e.g. Diphenylpyraline
Astemizole
Pyrobutamine
Clemizole
Azelastine
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