Reference 1 in John's post is very useful since it gives a simple table of commonly prescribed drugs which are also CYP3A4 inhibitors. It would be useful to know if any PwP , already taking levodopa in some form ir other, had noticed any effects, positive or negative, when taking these drugs prescribed for another condition.
It would also be useful to know if they were warned about possible drug-drug interactions by their Dr or pharmacist.