Welcome to Connect, @alan24.
You may notice that I moved your post to this existing discussion on gastroparesis as I thought it would be easier for you to connect with other members discussing this condition.
If you click on VIEW & REPLY in your email notification, you will see the whole discussion and can join in, meet, and participate with other members talking about their or their loved ones' experiences.

While we wait for fellow members to respond, I thought I’d let you know about this journal article I found online:
The effect of drugs and stimulants on gastric myoelectrical activity https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4110358/

Beta blockers have certainly evolved over the years; are you concerned about any specific impact they might have on gastroparesis, @alan24