Although most people tolerate Toprol-XL® well, side effects may occur with the medication. Common side effects of Toprol-XL include tiredness, dizziness, diarrhea, and slow heart rate. Less common side effects of the medication include such things as headache, insomnia, and low blood sugar. Most Toprol-XL side effects tend to be minor, but contact your healthcare provider immediately if you experience unexplained swelling, sudden weight gain, chest pain, or an unexplained skin rash with Toprol-XL.
(Click Side Effects of Toprol-XL for more information about common side effects of Toprol-XL, rare but possible problems that may occur with the drug, and serious side effects of the medication that require immediate medical attention.)