high blood pressure
"Switched from atenolol to Coreg CR to avoid the wall I would hit when doing cardio-exercise. I felt less of the wall from the cardiac side, but seemed to not breath as easily while doing cardio and while at rest. Felt like I had to force myself to take deep breaths on Coreg CR. Never had that happen with atenolol. Also, lost some libido on Coreg CR which wasn't an issue with atenolol. Switched back to atenolol and these issues all went away. "