Hello Doctor, My mother is a 57 year's old and her treatment is being done from AIIMS Hospital Since 17 year's, everything was well before one month but from last month she has got dry cough .she has taken all the medicine priscribed by the AIIMS Doctor but there is no effect on the cough. the blood report is also normal. her cough is not continuous. But when it's start it goes unstoppable for while. due to cough she also feeling pain in throat. She is taking cough syrup named "GRILINCTUS" Please Suggest.