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Doctor insights on: How Long Does Allegra Stay In Your System

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How long does Allegra-D stay in your system?

How long does Allegra-D stay in your system?

12 or 24 hours: allegra-d 12 hours, stays for 12 hours, as well the 24 hours preparation, stays for 24 hours, it's a combo medicine, ...Read more

Dr. Ronald Krauser
334 doctors shared insights

Fexofenadine (Definition)

Fexofenadine, previously marketed under the brand name allegra, is an antihistamine similar to ...Read more


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How long does it take allegra (fexofenadine) to leave your system?

How long does it take allegra (fexofenadine) to leave your system?

Antihistamines: The antihistamines Allegra (fexofenadine), Claritin (loratadine), and zyrtec (cetirizine) can last in your body for more than a week. Most allergists want these medications discontined for a week before they perform skin testing. Some persons are 'slow-metabolizers' and these drugs can be in your system much longer. ...Read more

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Does allegra (fexofenadine) build up in your system?

Allegra (fexofenadine): Needs about 45 minutes to start working and wears off within a day or 2, so you need to take it daily for maximum effect. ...Read more

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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?

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?

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. ...Read more

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How long does it take for allegra's effects to begin?

Pretty Quickly: Allegra (fexofenadine) and most otc antihistamines has its effect within the first 30 -60 minutes. ...Read more

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How long does allegra (fexofenadine) medication take to expire?

Read the label: There is considerable debate about the accuracy of label expiration dates. However, as a general rule, it is best to adhere to what the label states is the expiration date. This is especially true of liquid medication. ...Read more

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How long does it take for allegra (fexofenadine) 24hr to start working? Does not include pseudophedrine.

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. ...Read more

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How long does allegra (fexofenadine) d stay in your bloodstream?

Decongestants: In the combination drugs like claritin-d, Allegra-D or zyrtec-d the decongestant medication is formulated for slow release over a period of 12 (claritin-d12) or 24 hours (claritin-d24). ...Read more

Dr. Michael Finkelstein
358 doctors shared insights

Allegra (Definition)

Allegra is a non-sedating antihistamine which is a kind of antihistamine type drug (common ...Read more