My Son got cold in 2014 January and after four months he was coughing continuously and also got difficulty in breathing. Later on a doctor gave him budate 200 rotacap which he continued for 2 years. He was good for 8 months after the course . But by December he got the same symptoms so we consulted a doctor who gave him Levolin inhaler . Now we showed him to a pulmonologist who gave him formonide 100.deriphyllin od 300, montair lc kid. For how long we have to continue the medicine.