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. Steven Seres
Board Certified,
17 years in practice
497K people helped
Continue
108,000 doctors available
Read more answers from doctors