Aims: The present study was performed to evaluate the effect of mometasone furoate on a nasal congestion model in Brown Norway rats. Methods: Nasal congestion in rats sensitized with toluene-2,4-diisocyanate (TDI) was measured using whole-body plethysmography which allowed animals to move freely. Results: Penh (enhanced pause), an index of nasal congestion, was significantly increased after 5% TDI challenge in sensitized rats compared with that in non-sensitized rats. The peak of the increase in Penh appeared at 1 and 5 h after TDI challenge. A single topical administration of mometasone furoate (0.05%) at 1 h before TDI challenge suppressed the increase of Penh in sensitized rats. A significant effect was observed 5–6 h after nasal administration. Almost the same results were obtained with fluticasone propionate (0.05%). Conclusion: Mometasone furoate may therefore be effective and have a rapid onset of action in nasal congestion when used clinically as with fluticasone propionate.

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