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A member asked:
Will anti histamines such as zyrtec or allegra (fexofenadine) so on, effect methacholine since its a histmane and cause negative results?
A doctor has provided 1 answer
It may potentially: Antihistamines are not to be taken for at least 24 hrs but preferably 72 hrs prior a methacholine challenge. Having said that , I would doubt the average dose of AH is potent enough to block a truly positive response.
Answered 3/30/2015
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