My child suffering from only dry cough since 20 days. Before 2 months he suffered by pnemonia after cure pnemonia he starts cough not cure completely. I visited doctor he prescribed soventus and antibiotic for 5 days but cough not cure completely after 5 days I again visited doctor he prescribed Alerid mega cv antibiotic 5 days and cough syrup azitheral and nebulizer 3 days but again not cure totally he told me his chest is clear but why my son's coughing is not cure totally please suggest what I do. N Cough is not continuously he cough in morning max time and 5 hr 6hr later once very small amount of cough please suggest what I do