HiMy son is 9 yrs old and has had a terrible barking cough esp at night x3-4dys. He is on Allegra, albuterol, and advair but it doesnt seem to help as fast as I would like. I took him to an allergist about 2 yrs ago for a similar problem and he did not  have allergies per their test panel.  Any suggestions on what to do now? Thank you
Hello, Welcome to Chat Doctor, The symptoms suggests me that your son is having viral bronchitis, it will take some time for the symptoms to come down. As he is taking appropriate treatment, as it is a viral infection it has to come down by itself the treatment what he is receiving is the supportive treatment and the symptoms will come down in 3-5 days following the onset of the symptoms and the treatment received. As he was tested for the allergen it may not be due to allergy, it is a viral infection which will come down. Thank you.