It is possible that you may experience some or none of the Coreg side effects explained in this article. Unfortunately, there is no way for your healthcare provider to know beforehand if you will develop side effects from a medicine that you have never tried. Therefore, make sure to let your healthcare provider know if you develop any side effects or if something "just does not seem right." While it may not be a side effect, your healthcare provider will be able to diagnose and treat the problem.