A 35-year-old member asked:

How many days does it take for allegra (fexofenadine) to work?

2 doctor answers • 4 doctors weighed in

Dr. Andrew Murphyanswered

Allergy and Immunology 30 years experience

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.

4.8k viewsReviewed Jul 28, 2020

Dr. Heidi Fowler

Dr. Heidi Fowler agrees1 doctor agrees

Dr. Heidi Fowleranswered

Psychiatry 26 years experience

Allegra: Allegra can start working within a hour.

58 viewsReviewed Jul 28, 2020

Dr. Frank Kuitems

Dr. Susan Rhoads

Dr. Frank Kuitems and another doctor agree2 doctors agree

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My doctor told me not to take my Allegra (fexofenadine) and Zyrtec 5 days before my skin allergy test but my symptoms are really severe. should I just take my meds?

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How fast does allegra (fexofenadine) work?

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Can i take 24 allegra (fexofenadine) daily?

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Can i take 2 allegra (fexofenadine) within 24 hours?

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Last updated Jun 5, 2021

Found in:

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