Anti-Allergic Agents refers to the prevention and treatment of allergic reactions caused by various antigenic substances (such as bacteria, viruses, parasites, etc.). According to the mechanism of action, it can be divided into antihistamine drugs, anaphylaxis mediator blockers, histamine desensitizers, leukotriene receptor antagonists, antigenic antibody reaction drugs and drugs to improve or control allergic symptoms. Histamine H1 receptor antagonists are mostly used in clinic.
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