The Effect of Antihistamines on the Immediate Allergic Response: A Comparative Review

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Abstract
Antihistamines are believed to reduce the sneezing and rhlnorrhea associated with allergic rhinitis, primarily by competitive antagonism of histamine for H1 cellular receptors, but additional mechanisms of action may contribute to their clinical efficacy. To Improve our understanding of H1 antihistamine action, we studied the effects of pretreatment with terfenadine, cetirizine, ketotifen, azatadine, diphenhydramine, and azelastine on increases in vascular permeability, mast cell activation, and sneezing Induced by nasal challenge with antigen. All studied antihistamines reduced sneezing, Indicating that they all effectively antagonize histamine after its release. In addition, terfenadine and topically administered azatadine blocked the release of histamine. Studies with cetlrizine and azelastine revealed that these antihistamines significantly reduced sulfldopeptide leukotriene levels. Terfenadine and azelastine also reduced klnin production. These results confirm that antihistamines are effective in reducing sneezing and, in some cases, vascular permeability. The findings of these studies also Illustrate that the various antihistamines have multiple and different mechanisms of action that may have Implications for their clinical uses.
Funding Information
  • National Institutes of Health (AI 31335)