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Doctor insights on: Long Term Effects Of Fexofenadine

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Hello Dr. My boyfriend just discovered that he is allergic to our new kitten, can Allegra (fexofenadine) be taken everyday to help symptoms? Is it a long term fix

Hello Dr. My boyfriend just discovered that he is allergic to our new kitten, can Allegra (fexofenadine) be taken everyday to help symptoms? Is it a long term fix

Cat allergy: Greetings. Yes, Allegra (fexofenadine) can be used regularly for a fixed allergic exposure. Other medications could be added as needed. Since he was allergy tested, was he highly allergic? Does he have asthma? Is he allergic to other triggers? All these questions are important to see what might be best. Even allergy shot desensitization may be helpful. Follow up with your Allergist if Allegra (fexofenadine) isn't working.

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Dr. Thomas Fiala
357 Doctors shared insights

Fexofenadine (Definition)

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


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I have rhinitis. No environmental allergies No deviated septum. No sleep apnea. Normal weight. Want to stop snoring Allegra (fexofenadine) helps. Need long term soln?

I have rhinitis. No environmental allergies No deviated septum. No sleep apnea. Normal weight. Want to stop snoring Allegra (fexofenadine) helps. Need long term soln?

Suggestions: Have you tried an inhaled nasal steroid for the rhinitis? Your dentist can make you a mouth guard that may help with your snoring. There are also surgical procedures. You may want to see an ENT if you haven't already.

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

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.

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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.

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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.

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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).

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Can I take more than one Allegra (fexofenadine) 180 24 hour tablet per day? For how long can I take this?

Yes: You can for a day or two, depending on why you need it for, if longer you need a doctor to look at you, you might need additional/different medicine, an allergist can help, check aaaai. Org or acaai. Org for an allergist in your area, good luck,

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How long do I have to wait to take Allegra (fexofenadine) after I have taken an antibiotic? Thank you

How long do I have to wait to take Allegra (fexofenadine) after I have taken an antibiotic? Thank you

Do not have to wait: Allegra (fexofenadine) is an antihistamine and does not have to be separated from antibiotics that you take. You could even take them together and it would be fine.

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How long should I keep taking Flonase and allegra (fexofenadine) and do they negatively impact each other at all?

Depends: In general, these medications are safe to take over a long period of time, and actually work together to treat symptoms associated with allergic rhinitis. However, if you have been on these medicines for a while, I would recommend seeing an allergist for more definitive treatment options.

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For how long is it safe to take allegra (fexofenadine) for allergies?

Long term: Allegra (fexofenadine) is a new generation, non-drowsy antihistamine with a good safety profile. In general antihistamines as a class have been around for decades and long term use has not been associated harmful side effects. Most clinical trials for safety are 1 year, but practically speaking, Allegra is safe for ongoing use.

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If I ignore my allergy symptoms, will they become worse over time? I have them all year long. Which is the best med for relief, allegra (fexofenadine)? I'm 35.

See below: Allergy symptoms do not necessarily become worse with time. The best med is the one that works. Loratidine, fexofenadine and Cetirizine are all good meds. You may benefit from some targeted therapy on top of this. Maybe additional topical meds for your skin, nose, eyes or lungs depending on your symptoms.

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Can I take 24 hour Allegra, (fexofenadine) everyday for a long time? I feel like without it my allergies get really bad no matter what season it is.

Yes: It has been safe to use daily Allegra (fexofenadine) for long periods of time. However, I would recommend that anybody requiring more than occasional use of otc antihistamines be seen by an Allergist to better define triggers and risk. There are many available treatment options to consider.

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My daughter is 4 years old and her doctor told me to give her childrens allegra (fexofenadine) for two moths is that safeto take for that long?

My daughter is 4 years old and her doctor told me to give her childrens allegra (fexofenadine) for two moths is that safeto take for that long?

Use as needed: Fexofenadine (allegra) is ok over 6 months of age and has a good safety profile. It is a slowly metabolized antihistamine that does not cross into the brain and cause sedation like some similar drugs. The body does not develop a tolerance (require increasing amounts to be effective). It is safe enough to use all year of for the several months your child seems bothered by seasonal allergies.

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I am taking Allegra (fexofenadine) 12 hour and mucin we dm almost daily and have been for a long time. Can this lower my white blood cell count?

I am taking Allegra (fexofenadine) 12 hour and mucin we dm almost daily and have been for a long time. Can this lower my white blood cell count?

No: Unlikely with fexofenadine, but I would be bit careful with mucinex (guaifenesin) dm, the dextromethotphan part of it has an abuse potential, read the labels carefully, consult your doctor if you're still not controlled, you can use mucinex (guaifenesin) alone, and dextromethotphan only as needed, good luck