Advances in H1-antihistamines
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There are four major types of histamine receptor,H1,H2,H3 and H4 in human body. Histamine plays its biologic role primarily through its receptors. At present,H1-antihistamines are mainly used to treat urticaria and other allergic diseases as well as central nervous system and vestibular disorders. There has never been standardized studies on the application of first-generation H1-antihistamines in the treatment of allergic diseases, and most clinical trials of these drugs do not meet the standards for randomized, double-blind,placebo-controlled trial (RCT). In contrast, the second-generation drugs are supported by large number of normative trials. Clinically, most H1-antihistamines are safe and effective, but the side effects on central nervous system and the heart should not be ignored.