I have mixed beta blockers with psychedelics to lessen stress on the hearth (as there was some concern that my genetics made high blood pressure dangerous)
I have since stopped this after learning about possible risks. It was a long time ago I read about the risks so I don't have the same source, but a quick search came up with:
https://erowid.org/pharm...ers_interactions1.shtml
A friend of mine ate beta blockers for many years for social anxiety. This firend also experimenting with a wide range of psychoactives and developed some form of tissue damage. It looks like a frost bite and is permanent. His physician thinks it is related to the beta blockers.
Beta blockers are known to increase risk of frost bite and I can imagine combining them with vasoconstrictors can worsen the risk quite a bit.
All this said, I personally never had a problem and know of other explorers that use propranolol as a pre-flight anxiety cure. I never found them to be of such use to me but I figure they could ease axniety-heart rate feedback loop type of scenarios.