A 41-year-old member asked:
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how long does it take allegra (fexofenadine) to leave your system?

1 doctor answer
Dr. Michael P Vaughn
33 years experience Allergy and Immunology
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.
Answered on Nov 23, 2019
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A 32-year-old member asked:
Dr. Stephen Kimura
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Maybe: Allegra (fexofenadine) is metabolized mainly through the liver so the dosage will need to be adjusted. It will depend on how severe the liver disease ... Read More
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A 47-year-old member asked:
Dr. Jeffrey Rumbyrt
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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 ... Read More
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A 34-year-old female asked:
Dr. Al Hegab
Dr. Al Hegab answered
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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, ... Read More
A 36-year-old male asked:
Dr. Grace Akoh-Arrey
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About 3-4 hours: Peak concentration after a dose of Allegra (fexofenadine) is in about 2&1/2 hours. Thus eating your high fat meal about 3 hours post a dose would be h ... Read More

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