My daughter age 15 years is having cough since last 33 days. Earlier for a fornight it was dry coughing but very severe. She was prescribed Zyrtec, Actified DM and Neb with duolin Later it was productive cough with relief in continuous coughing and doctor changed medicine to Ventorlin and Advente Forte 200 ( twice ). Her coughing period has reduced but she coughs once in around 2 hrs but it affects her normal breathing. Her food intake is normal, weight normal and no fever. What should be done ?