Propranolol
"Just found out after 4 months of using this drug 40mg a day for anxiety that it can cause HEART FAILURE in otherwise healthy adults. In low dose this drug will definitely stop the pounding heart beat but I notice if I have a panic attack my heart still races. I'm sure if you took 80mg a day that wouldn't be a problem though. Shortness of breath too after taking, I'd strongly advise against this drug. Find something else."