Good Morning:
My father undergoes DBS in 2016 and after that he is constantly have a problem with phlegm and cough. We have consulted with different ENT consultants and tried many medications but his situation is not improving. ENT doctors are saying it is related to somehow with the DBS and the doctor who performed the DBS surgery have no clue about it. Is anyone here with DBS have same problem and which medicine can help?

Best Regards
Khalid