Metoprolol: The Good, The Bad, and the UGLY — 10 Common Side Effects
Metoprolol is a beta-blocker used for conditions such as high blood pressure, angina, certain abnormal heart rhythms, heart failure, and after some heart attacks. It works partly by slowing the heart rate and reducing the heart’s workload. (MedlinePlus)
Like any medication, it can cause side effects. That doesn’t mean you should stop taking it—especially because suddenly stopping metoprolol can cause serious heart problems. (MedlinePlus)
10 possible side effects
- Tiredness or fatigue — one of the more common complaints.
- Dizziness or lightheadedness — particularly when blood pressure or heart rate falls too much.
- Slow heart rate (bradycardia) — metoprolol intentionally slows the heart, but excessive slowing can be problematic.
- Low blood pressure — which can cause weakness, dizziness, or fainting.
- Shortness of breath — should be reported, particularly if it is new or worsening.
- Diarrhea or other digestive problems — diarrhea is a recognized side effect.
- Sleep problems or nightmares — these can occur in some people.
- Depressed mood or difficulty concentrating — depression and cognitive symptoms have been reported.
- Cold hands and feet — reduced circulation to the extremities can occur.
- Swelling or sudden weight gain — these can sometimes indicate worsening heart failure and require prompt medical attention. (MedlinePlus)
🚨 When to get medical help
Seek urgent medical attention for severe difficulty breathing, fainting, significant swelling, rapid or irregular heartbeats, or other severe symptoms. (MedlinePlus)
Also, metoprolol can make some of the warning symptoms of low blood sugar less noticeable, which is particularly important for people with diabetes. (MedlinePlus)
Bottom line: Metoprolol can be an important and effective heart medication, and many people tolerate it well. Side effects should be discussed with the prescriber rather than prompting you to stop the drug on your own.
