My dad is 83 and lives with my family and I full time. He has Parkinson's along with other problems, although I know this issue is due to the Parkinson's. He has been having a terrible cough because he gets that phlegm that comes with PD not in his throat and not in his lungs but right in between. When it gets stuck there, he cannot cough it up or swallow it down so he gets this deep honking cough going on which keeps him up half the night. Now he's like a zombie. Sleeping all the time. He has been prescribed tessalon perles and they do thin the mucous, but it's just not enough to get rid of it one way or the other. Anyone have any suggestions?