Metoprolol is a prescription medication used to treat conditions such as high blood pressure, chest pain, heart failure, and certain abnormal heart rhythms. Most people tolerate it well, but like all medications, it can cause side effects. Some are common and mild, while others deserve prompt medical attention.
10 side effects that may be overlooked
- Fatigue or low energy
- Feeling unusually tired is one of the most common side effects, especially when starting treatment or after a dose increase.
- Slow heart rate (bradycardia)
- A lower heart rate is expected to some degree, but if it causes dizziness, fainting, or weakness, contact your healthcare provider.
- Dizziness or lightheadedness
- This may occur when standing up quickly because the medication can lower blood pressure.
- Cold hands and feet
- Metoprolol can reduce blood flow to the extremities, making them feel cool.
- Sleep changes
- Some people report vivid dreams, insomnia, or disturbed sleep, although these effects are not experienced by everyone.
- Depression or mood changes
- Mood changes have been reported by some patients, but the relationship between beta blockers and depression is still being studied.
- Shortness of breath or wheezing
- Although metoprolol is relatively selective for the heart, it can still worsen breathing problems in some people, particularly those with asthma or certain lung diseases.
- Sexual dysfunction
- Some people may experience reduced libido or difficulty with sexual function.
- Masking symptoms of low blood sugar
- In people with diabetes, metoprolol can make it harder to notice warning signs of low blood sugar, such as a rapid heartbeat.
- Digestive symptoms
- Nausea, diarrhea, constipation, or stomach discomfort can occur, though they are usually mild.
When to seek medical care promptly
Contact a healthcare professional or seek urgent care if you experience:
- Fainting or severe dizziness
- Difficulty breathing or severe wheezing
- Chest pain that is new or worsening
- Very slow heartbeat with symptoms
- Swelling of the face, lips, tongue, or throat (possible allergic reaction)
Important tips
- Do not stop metoprolol suddenly. Abruptly discontinuing it can cause rebound increases in heart rate and blood pressure and may increase the risk of chest pain or heart attack in some people.
- Take it exactly as prescribed.
- If side effects are troublesome, speak with your healthcare provider. They may adjust the dose or recommend an alternative medication.
If you’re taking metoprolol and are concerned about a specific symptom, let me know what you’re experiencing, your dose, and how long you’ve been taking it, and I can help explain whether it’s a recognized side effect or may have another cause.
