DADAWG, propranolol is a beta blocker used my millions of people here in the UK alone. It is in no way, shape or form dangerous. I have a feeling you were thinking of Propofol, which is the shit Michael Jackson was using.
Does anybody have an answer as to whether taking propranolol (or something like Xanax) to combat the sides of clen might actually stop the clen working? I really struggle with the sides.