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  • Title: The effects of astemizole, cetirizine and loratadine on the time course of weal and flare reactions to histamine, codeine and antigen.
    Author: Humphreys F, Hunter JA.
    Journal: Br J Dermatol; 1991 Oct; 125(4):364-7. PubMed ID: 1683252.
    Abstract:
    An open cross-over study was performed to assess the effects of astemizole, cetirizine and loratadine on weal and flare reactions to intradermal histamine, codeine and house dust mite antigen. Percentage inhibition of weal area, flare area and weal volume was greatest for cetirizine, then astemizole and smallest for loratadine. Wealing due to mast-cell degranulation with either codeine or antigen was less inhibited by all three antihistamines than that due to histamine itself. Time-course studies revealed similarities between wealing provoked by codeine and histamine but different characteristics to that induced by antigen.
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