Metoprolol is a beta-blocker commonly prescribed for conditions such as high blood pressure, angina (chest pain), certain heart rhythm problems, and heart failure. Like all medicines, it can cause side effects—some of which may be less obvious or not discussed as often.
Here are 10 metoprolol side effects that people may overlook:
- Unusual tiredness or low energy
- Because metoprolol slows heart rate and reduces the body’s response to stress hormones, some people feel more fatigued, especially when starting treatment or after a dose increase.
- Dizziness or lightheadedness
- This may occur when blood pressure drops too low, particularly when standing up quickly.
- Cold hands and feet
- Reduced circulation to the extremities can make fingers and toes feel colder than usual.
- Slower-than-usual heart rate (bradycardia)
- A slower pulse is an intended effect for many patients, but an unusually low heart rate can cause weakness, dizziness, or fainting.
- Sleep changes or vivid dreams
- Some people report insomnia, unusual dreams, or changes in sleep patterns.
- Mood changes
- Less commonly, people report low mood or emotional changes. These symptoms should be discussed with a healthcare professional.
- Sexual side effects
- Some people experience reduced libido or erectile difficulties, although the relationship varies among individuals.
- Shortness of breath or reduced exercise tolerance
- A decrease in stamina can occur, especially early in treatment. New or worsening breathing problems should be evaluated.
- Digestive symptoms
- Nausea, diarrhea, constipation, or stomach discomfort can occur.
- Masking signs of low blood sugar
- In people with diabetes, beta-blockers can make warning signs like a racing heartbeat less noticeable during hypoglycemia.
When to contact a healthcare professional
Seek medical advice if you experience:
- Fainting or severe dizziness
- Very slow heartbeat
- New or worsening shortness of breath
- Chest pain
- Swelling of the legs or sudden weight changes
- Severe mood changes
Important: Do not stop metoprolol suddenly without medical guidance. Abruptly stopping beta-blockers can worsen some heart conditions and may cause serious complications.
If you take metoprolol, the most useful information for interpreting side effects is your dose, whether it is immediate-release or extended-release, why it was prescribed, and when symptoms started.
