m in the medical field), and sexual
dysfunction or
erectile dysfunction is not even listed as a potential side effect. It CAN cause some hypotension (low blood pressure), but if this consistently caused problems with ED, it would definitely been listed.
You didn't mention how old you are. Sometimes age can cause pump power problems, as well as stress, depression, and other psychological stuff.
It doesn't sound to me like it's the Sotalol, but you can always ask your doc.