Hello, Omnacortil is a steroid that is used for different conditions like allergic reactions, asthma and other inflammatory diseases. It can be used to reduce the inflammation in the lungs which is causing breathing difficulty to your child. As it has been suggested this by a doctor, you do not need to worry, he has prescribed this after careful examination of your child s symptoms and the dosage is calculated as per his weight. So follow the instructions while giving the medicine. Still in doubt, talk to your doctor regarding this. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Manisha Auradkar, General & Family Physician