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A member asked:
Does allegra (fexofenadine) 24 hours (not with d) surpress your immune system? can i get blood work (cbc w/diff) done while on allegra (fexofenadine) and have it be accurate?
A doctor has provided 1 answer
No: Allegra (fexofenadine) is an otc non-sedating antihistamine and as such down regulates the release of histamine from mast cells in the tissue or decreases the effect of histamine that is released. I do not think it would significantly suppress the immune system which is primarily lymphocyte function. You can get blood work. The only thing, you can not do is get skin testing for allergies while on this drug.
Answered 6/24/2014
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