Metoprolol is a beta-blocker commonly prescribed for high blood pressure, angina (chest pain), certain heart rhythm problems, and heart failure. It works by slowing the heart rate and reducing the effects of stress hormones like adrenaline.
Most people tolerate metoprolol well, but it can cause side effects—especially when starting treatment or after a dose change.
10 common side effects of metoprolol
1. Tiredness or low energy
- Feeling more fatigued than usual is one of the most commonly reported effects.
- It may improve as your body adjusts.
2. Dizziness or lightheadedness
- This can happen because metoprolol lowers heart rate and blood pressure.
- Standing up slowly may help reduce symptoms.
3. Slow heartbeat
- A slower pulse is an expected effect, but a very slow heart rate with weakness, fainting, or confusion should be checked.
4. Cold hands and feet
- Reduced circulation to the extremities can make fingers and toes feel colder.
5. Sleep changes or vivid dreams
- Some people notice trouble sleeping, unusual dreams, or changes in sleep patterns.
6. Mild digestive symptoms
- Nausea, diarrhea, constipation, or stomach discomfort can occur in some people.
7. Reduced exercise tolerance
- Because the heart rate does not rise as quickly during activity, some people feel they tire more easily during exercise.
8. Sexual side effects
- Some people report changes in sexual function or reduced interest.
9. Mood changes
- Rarely, people may notice low mood or changes in emotional well-being.
10. Shortness of breath or wheezing (in susceptible people)
- Beta-blockers can affect breathing in some people, particularly those with asthma or certain lung conditions.
Contact a healthcare professional if you experience:
- Fainting or severe dizziness
- Very slow heartbeat
- New or worsening chest pain
- Severe shortness of breath or swelling
- Confusion or unusual weakness
Important:
Do not stop metoprolol suddenly unless your prescriber tells you to. Stopping abruptly can cause a rapid increase in heart rate or blood pressure and may worsen some heart conditions.
If you take metoprolol, sharing your dose (such as 25 mg, 50 mg, or 100 mg), why you take it, and any symptoms you’ve noticed can help put possible side effects into context.
