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A member asked:

Allegra (fexofenadine) -d 12 hour allergy & congestion can show up on a drug test as amphetamine?

A doctor has provided 1 answer
Dr. John Chiu answered

Possible: Since the Pseudoephedrine in the d is often used to manufacture amphetamine, i would guess that it can show up in a blood test. I would advise you to stay off of any decongestants if you are subjected to random drug test until i can look this up.

Dr Ali and another doctor agreed

Answered 4/2/2016

4.9k views

Thank

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I have seasonal allergy and taking allegra (fexofenadine) d 24 hour. My blood pressure is gone up. Can the drug be the cause? Will my BP go down when i stop?

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Allergy Dr ordered allergy bloodtests, I take Zyrtec, Allegra, (fexofenadine) singular for chronic urticaria each day. He said these will not affect the tests, true?

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