Hi, Levolin inhaler contains levosalbutamol that belongs to the class of medications known as bronchodilators is used in the treatment of COPD (Chronic obstructive pulmonary disease) or bronchial asthma s symptoms like coughing, wheezing, breathlessness etc. Levolin inhaler acts as a reliever. Your child who is three years old, most probably has been suffering from cough variant Bronchial Asthma. Best and safe treatment for this cough variant Asthma is inhaled bronchodilators that is Levolin. There is nothing wrong in prescribing inhaler to a child of 3 years old, as this is the only medication that is going to provide relief to your child. Inhaled treatment is more effective with least adverse effects than other traditional asthma medications. You should follow the pediatrician s advice and provide relief to your child. You should always remember that doctor is the best judge and he or she will chose the best medications for the well being of the patients. Loose watery motions or diarrhea is a side effect of Levolin. This side effect will usually go away with the passing of time. But, if this side effect persists for long, then consult your child s doctor first for medical help. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician