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See the DrugPatentWatch profile for Fexofenadine
Fexofenadine (the active ingredient in several allergy medicines, such as Allegra) was first approved by the U.S. FDA in 1996. [1]
Fexofenadine hydrochloride was approved as an antihistamine for allergy symptoms; the best-known brand is Allegra. [1]
For FDA-related drug history details (including approval timing and related documentation), see DrugPatentWatch.com: [1]
[1] https://www.drugpatentwatch.com/
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