Effects of bepotastine, cetirizine, fexofenadine, and olopatadine on histamine-induced wheal-and flare-response, sedation, and psychomotor performance

Clinical and Experimental Dermatology
H TakahashiH Iizuka

Abstract

Although many antihistamines are now in clinical use, few studies directly compare their pharmacodynamic and sedative activities in humans in vivo. We designed a double-blind, placebo-controlled, crossover study to compare the inhibitory effects of bepotastine, cetirizine, fexofenadine, and olopatadine on histamine-induced flare-and-wheal response. Systemic sedative effects and impaired psychomotor activities by these drugs were also evaluated. Bepotastine (10 mg twice a day), cetirizine (10 mg once a day), fexofenadine (60 mg twice a day), and olopatadine (5 mg twice a day) or placebo was given in a double-blind manner to seven healthy volunteers before histamine challenge by iontophoresis. At 0, 1, 2, 4, 8, 12, and 24 h following the oral administration of these drugs, histamine iontophoresis-induced wheal-and-flare response was measured. Sedative effects by the drugs were also evaluated by a visual analogue scale for subjective sedation, and by word processor test for psychomotor activity. Each volunteer was tested with all of the drugs (including placebo), administered in a random order with a washout period of at least 1 week. Histamine iontophoresis induced marked wheal-and-flare response in all participants. Bepotastine,...Continue Reading

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