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A member asked:
How fast does allegra (fexofenadine) work?
5 doctors weighed in across 2 answers
20-30 minutes: Oral antihistamines like Allegra (fexofenadine) need to be absorbed by the digestive system and distributed thru the body before they are effective--about 20-30 minutes. This lag time is usually acceptable for minor allergy symptoms. But if you have asthma, swelling in the throat, or anaphylaxis, taking a quick-acting rescue med like Epinephrine or albuterol can be life-saving. Ask your doctor for more info.
Answered 11/14/2020
4.9k views
Allegra: Allegra usually starts working within an hour.
Answered 7/28/2020
58 views
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