Hi my son has cough variant asthma, he is on a controller med of symbicort and recently was given duoneb in instead of albuterol for a flair up he had that was not improving after oral steroids. He again has began having a more wet cough and instead of starting albuterol, i started duoneb treatments one to two times a day as needed, they seem to be working much better than the straight albuterol, but i was wondering if duoneb is only supposed to be used when his flair up is more severe or if it is okay to start initially. I feel like the duoneb has kept his symptoms from progressing. Thank you for your time