Here at Androscoggin Valley Hospital we have also switched to Aridol for our bronchial challenge testing. We've found Ken Rundell from Pharmaxis to be very helpful for questions/concerns that we've had - he has offered to speak with us individually via phone or directly with our Pulmonary MD whenever needed. There have also been frequent Webinars available (free) for any staff to participate in -along with a 15 minute Q&A. If interested, contact..Loretta at 888-416-1826, ext 524. The company makes available a very specific guideline to follow/refer to...has been really helpful to our staff as they are performing test. Hope this helps...