Onset of Action, Efficacy, and Safety of a Single Dose of Fexofenadine Hydrochloride for Ragweed Allergy Using an Environmental Exposure Unit

Fexofenadine hydrochloride is the active acid metabolite of terfenadine. Fexofenadine's antiallergic properties require confirmation in a clinical setting. The purpose of this study was to characterize the time to onset of clinically important relief of symptoms of allergic rhinitis in subjects...

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