helloo every one my son is 3 years old every 1 and half month he is having cold and severe cough . fist he will star with cold but he will not have cold immediately it converts into cough and that will not get controlled we went to doctor they will give levolin and maxtra and azithromycin and nebuliser that will get controlled for 10 or 15 days but it is happening continuously sometimes it will not controlled he is suffering a lot will u pls suggest something .