The one I take is called Bisoprolol. I did used to be on Atenolol until a few years ago but had to come off that as I was getting that slow heart rate again (once again it dropped below 50 on a regular basis) so had to switch medication as I was already on the lowest dose of Atenolol.
I think propanolol is the one that is prescribed by Doctors for public speakers, musicians etc to help with what may best be described as stage fright.