hello, I am mother of 2.4 yr old baby, one day back midnight she wake up and told me her nose are itchy and cried and vomit, she is fussy that night.yesterday morning she has nose block and dry cough. so we take her to hospital doctor gave me ascoril D syrup.yesterday night we gave her ascoril D syrup. from today morning her cough changed from dry to mucus cough. can I continue the same medicine or I have to change medicine. why dry cough suddenly change into wet ?????