high blood pressure
"Since switching to Bystolic from atenolol I have experienced my arms falling asleep at night and light headedness. Coreg CR made me cloudy in thinking, felt like a rubber band was around my chest, and I didn't feel as calm as when I was taking atenolol. I switched from atenolol to Coreg CR so I could overcome the wall I would hit while pushing cardio-excercise to the limit. I felt great everyday all day long on atenolol."