Hello. Thanks for writing to HCM. I read and understand your question very well. I try my best to help you in this. As your son on asthalin rotacap medication and cough occur when you stop medicine.This is happens due to narrowing of trachea and bronchioles. Also due to asthma due to allergic condition, bronchiolitis , or any other lung pathology. There are some side effect of asthalin like most common - Tremor, anxiety, headache, muscle cramps, dry mouth, and palpitations.Other like sleeplessness, weakness, dizziness, drowsiness,fast / slow heart rate, flushing and chest pain,muscle cramps, muscle, bone or back pain,nausea, worsening of diabetes, vomiting, cough and throat irritation,allergic reactions and rash. If you have persist cough than consult a good pulmonologist for this. I hope my advice will help you a lot. Thanks and Regards. Dr Vijay