Beta blockers are typically prescribed to help control high blood pressure and I would estimate that PD is considered more of a senior citizen condition and many may have high blood pressure, increasing the chance that you may potentially be using a beta blocker to control HBP?
If that is correct, this newer PM study (March 2019) suggests that beta blockers may not be the best choice for PWPs.
ncbi.nlm.nih.gov/pubmed/308...
Art