3 doctors weighed in:

Would taking allegra (fexofenadine) before a methacholine challenge effect the results?

3 doctors weighed in
Dr. Robert Ramirez
Internal Medicine - Allergy & Immunology
2 doctors agree

In brief: It can

You should obviously avoid asthma inhalers.
The longer the work, the longer you should stop them for (eg advair for 24hrs). Antihistamines may not have as big an impact on the test as inhalers, but they should also be avoided for 24-48hrs.

In brief: It can

You should obviously avoid asthma inhalers.
The longer the work, the longer you should stop them for (eg advair for 24hrs). Antihistamines may not have as big an impact on the test as inhalers, but they should also be avoided for 24-48hrs.
Dr. Robert Ramirez
Dr. Robert Ramirez
Thank
Get help from a real doctor now
Dr. William Forsythe
Board Certified,
23 years in practice
171K people helped
Continue
108,000 doctors available
Read more answers from doctors