Can anyone help me with some advice on childhood asthma? My DS has just been diagnosed with asthma. The dr has started him on a trial of Singulair but it doesn't seem to have had any effect. He has a chronic cough (been there for over 8 weeks now) that has been treated with 2 different types of antiobiotic also without success. I am getting really worried now that it's something else more sinister. Any ideas?