Metoprolol: The Good, the Bad, and 10 Common Side Effects
Metoprolol is a beta-blocker used to treat conditions such as high blood pressure, angina (chest pain), certain abnormal heart rhythms, heart failure, and to reduce the risk of future heart problems after a heart attack.
Many people take metoprolol safely for years. Like all medicines, however, it can cause side effects. Most are mild and often improve as your body adjusts to the medication.
Common Side Effects
1. Tiredness or Fatigue
This is one of the most common side effects, especially when starting treatment or after a dose increase. You may notice reduced energy or exercise tolerance.
2. Dizziness or Light-Headedness
Metoprolol lowers blood pressure and slows the heart rate, which can make you feel dizzy, particularly when standing up quickly.
3. Slow Heart Rate
A slower pulse is an expected effect, but if it becomes too slow it may cause:
- Fainting
- Severe dizziness
- Extreme tiredness
Contact your healthcare provider if these occur.
4. Cold Hands and Feet
Some people notice colder fingers or toes because beta-blockers can reduce blood flow to the extremities.
5. Sleep Changes
Some people experience:
- Difficulty sleeping
- Vivid dreams
- Nightmares
These effects are usually mild and don’t affect everyone.
6. Digestive Problems
Possible symptoms include:
- Nausea
- Diarrhoea
- Constipation
- Stomach discomfort
These often improve over time.
7. Sexual Side Effects
Some people report:
- Reduced sex drive
- Difficulty achieving or maintaining an erection
These symptoms can also have other causes, so it’s worth discussing them with your healthcare provider.
8. Mood Changes
A small number of people notice:
- Feeling low
- Reduced motivation
- Mood changes
Research has not consistently shown that metoprolol directly causes depression, but any persistent mood changes should be discussed with a healthcare professional.
9. Masking Low Blood Sugar Symptoms
In people with diabetes, metoprolol can make it harder to notice some warning signs of low blood sugar (hypoglycaemia), particularly a rapid heartbeat. Sweating may still occur.
10. Wheezing or Shortness of Breath
Although metoprolol mainly targets the heart, it can sometimes affect the airways, particularly in people with asthma or certain other lung conditions.
Seek medical advice promptly if you develop new wheezing or worsening breathing difficulties.
When to Seek Urgent Medical Care
Get immediate medical attention if you experience:
- Chest pain that is new or worsening
- Fainting
- Severe shortness of breath
- Swelling of the face, lips, tongue, or throat (possible allergic reaction)
- A very slow heartbeat with severe symptoms
Important Safety Tips
- Take metoprolol exactly as prescribed.
- Do not stop it suddenly. Abruptly stopping a beta-blocker can cause your heart rate and blood pressure to rise and may increase the risk of angina or a heart attack in some people.
- Tell your healthcare provider about all medicines and supplements you take, as interactions can occur.
