My child is 6 years old and was diagnosed with an allergic asthma. he is constantly coughing and neither the antihistamine, coughing syrup or nebuliser is helping.

Needs plan: Asthma is best managed with a written action plan based on symptoms recorded in a daily asthma diary. Cough medicines & antihistamines rarely if ever benefit asthma and may thicken secretions making it worse. At 6 a kid is able to be taught inhaler use. A daily maintenance inhaled steroid & rarely used rescue inhaler is the usual plan.Seek an eval by a pedi or asthma specialist.