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A member asked:
Just recently switched from zyrtec to allegra abt 4 days ago. how long until i feel the full affects?
A doctor has provided 1 answer
Within a few hours.: Generally these two medications are equivalent although some people prefer one over the other. They both work within hours of taking the dose.
Answered 7/18/2018
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Is it effective to take Allegra 4 days a week and Zyrtec 3 days a week?
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I read on the internet that it is often more effective to alternate days taking zyrtec and allegra, (fexofenadine) than just one drug alone. Is that true? -allergies
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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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