10 Metoprolol Side Effects That Are Often Overlooked
Metoprolol is a beta-blocker commonly prescribed to treat high blood pressure, angina (chest pain), certain heart rhythm disorders, heart failure, and to reduce the risk of future heart problems after a heart attack.
Most people tolerate metoprolol well, but like all medications, it can cause side effects. Some are mild and improve as your body adjusts, while others require medical attention.
1. Fatigue or low energy
Feeling tired is one of the most common side effects, especially when starting the medication or after a dose increase.
2. Slow heart rate (bradycardia)
Metoprolol slows the heart rate as part of its intended effect. If the heart rate becomes too slow, it may cause:
- Dizziness
- Fainting
- Extreme fatigue
3. Dizziness or lightheadedness
Because metoprolol lowers blood pressure, some people feel dizzy, particularly when standing up quickly.
4. Cold hands and feet
Reduced blood flow to the extremities may cause your hands or feet to feel cold.
5. Sleep changes
Some people report:
- Difficulty sleeping
- Vivid dreams
- Nightmares
These effects are not common but can occur.
6. Depression or mood changes
Mood changes have been reported with beta-blockers, although the evidence is mixed and not everyone experiences them.
7. Sexual side effects
Some people may notice:
- Reduced libido
- Difficulty with erections
- Sexual dysfunction
These symptoms can have many causes, so it’s important to discuss them with your healthcare provider.
8. Shortness of breath or wheezing
Metoprolol is relatively selective for the heart, but in some people—especially those with asthma or certain lung conditions—it may worsen breathing symptoms.
9. Masking signs of low blood sugar
In people with diabetes, metoprolol can make it harder to notice symptoms such as a rapid heartbeat during low blood sugar episodes. Sweating and confusion may still occur.
10. Stomach upset
Some people experience:
- Nausea
- Diarrhea
- Constipation
- Mild stomach discomfort
When to contact your doctor
Contact your healthcare provider promptly if you experience:
- Persistent dizziness
- Very slow heart rate
- New or worsening shortness of breath
- Fainting
- Swelling of the legs that is getting worse
- Side effects that interfere with daily life
Seek emergency care immediately if you have:
- Chest pain that is severe or worsening
- Difficulty breathing
- Swelling of the face, lips, tongue, or throat
- Loss of consciousness
Do not stop metoprolol suddenly
Stopping metoprolol abruptly can cause a rebound increase in heart rate and blood pressure and may increase the risk of chest pain or heart attack in some people. If it needs to be discontinued, it should usually be tapered under the guidance of your healthcare provider.
Bottom line
Metoprolol is an effective and widely used medication, and most people do not experience serious side effects. If you notice new symptoms after starting it, discuss them with your healthcare provider rather than stopping the medication on your own.
