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A member asked:
How many days does it take for allegra (fexofenadine) to work?
4 doctors weighed in across 2 answers
Hours: Allegra (fexofenadine) and most oral antihistamines will start to work within an hour or so. It does not take days for these medications to work.
Answered 6/5/2021
4.8k views
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Allegra: Allegra can start working within a hour.
Answered 7/28/2020
58 views
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