Propranolol XL has been studied thoroughly in clinical trials. In these studies, the side effects that occur in a group of people taking the drug are documented and are then compared to side effects that occur in another group of people not taking the medicine. This way, it is possible to see what side effects occur, how often they appear, and how they compare to the group not taking the drug.
In these studies, the most common
propranolol XL side effects included:
- Fatigue -- in up to 7 percent of people
- Dizziness -- up to 7 percent
- Constipation -- up to 3 percent.
It is possible that you may experience some or none of the propranolol XL side effects listed in this article. Unfortunately, there is no way for your healthcare provider to know beforehand if you will have 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 while taking this drug or if something "just does not seem right." While it may not be a propranolol XL side effect, your healthcare provider will be able to diagnose and treat the problem.