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A member asked:
How long does it take allegra (fexofenadine) to leave your system?
A doctor has provided 1 answer
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 1/2/2021
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