Metoprolol is a beta blocker commonly prescribed for high blood pressure, angina, certain heart rhythm problems, heart failure, and after a heart attack.
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For many people, it is effective and well tolerated. But like all medicines, metoprolol can cause side effects. Some are mild and temporary, while others may need medical attention.
The most important rule is simple: **do not stop metoprolol suddenly unless a healthcare professional tells you to**, because abrupt withdrawal can worsen chest pain, increase heart rate, and potentially trigger serious heart problems.
## 1. Tiredness and Low Energy
Fatigue is one of the more commonly reported side effects of metoprolol.
You may notice:
* lower energy than usual
* feeling tired during the day
* reduced exercise tolerance
* weakness
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This can happen because metoprolol slows the heart rate and reduces the workload on the heart.
* Give your body time to adjust, especially after starting treatment.
* Maintain regular sleep.
* Stay physically active within the limits recommended by your doctor.
* Avoid suddenly increasing intense exercise.
If fatigue is severe, persistent, or getting worse, speak with your healthcare professional.
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## 2. Dizziness or Lightheadedness
Metoprolol can lower blood pressure, which may sometimes make you feel dizzy or lightheaded.
This is often more noticeable when:
* standing up quickly
* getting out of bed
* exercising
* starting treatment
* increasing the dose
### What may help
Stand up gradually from sitting or lying positions.
What may help
Make sure you are drinking an appropriate amount of fluid unless you have been told to restrict fluids for a medical reason.
If dizziness is frequent, severe, or causes fainting, contact a healthcare professional.
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