My son 2 years had a cough from 2 months try bisolvon and ventolen and doctor say it because the childcare what treatment? also i try wet vapour

Chronic cough in a : child is often caused by Reactive Airway Disease, a term for bronchial spasm & inflammation without full-on asthma attacks. His pediatrician prescribed Ventolin, a bronchodilator, but also Bisolvon, dextromethorphan, a cough suppressant that can keep mucus from moving. Pediatric pulmonologists & allergist/immunologists diagnose & manage RAD & look for triggers like viruses, allergies &/or exercise