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A member asked:
How long does it take for allegra (fexofenadine) 24hr to start working? does not include pseudophedrine.
4 doctors weighed in across 2 answers
A day or so: Once you start taking allegra, (fexofenadine) it may work within a day for allergic symptoms. If it is not working for you, you may need to try another ant-allergic agent.
Answered 9/10/2016
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Allegra: Allegra can start working within an hour. Allegra contains fexofenadine hydrochloride. Allegra-D contains fexofenadine hcl and pseudoephedrine hcl.
Answered 7/28/2020
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