Metoprolol is a commonly prescribed beta-blocker used for conditions such as high blood pressure, angina, certain heart-rhythm problems, and heart failure. The headline “10 side effects they don’t tell you about” is somewhat sensationalized, but there are legitimate side effects worth knowing.
10 possible side effects
- Tiredness or low energy — particularly when first starting treatment.
- Dizziness or lightheadedness — especially when standing up quickly.
- Slow heart rate (bradycardia) — metoprolol intentionally slows the heart, but an excessively slow pulse can be a problem.
- Low blood pressure — which can cause weakness or faintness.
- Cold hands and feet — reduced circulation to the extremities can cause this sensation.
- Sleep disturbances or vivid dreams — some people notice changes in sleep.
- Depressed mood — mood changes have been reported, although they aren’t inevitable.
- Shortness of breath — this is more concerning in someone with asthma/COPD or if it represents worsening heart failure.
- Sexual difficulties — reduced libido or erectile dysfunction can occur in some people.
- Digestive symptoms — nausea, diarrhea, constipation, or stomach discomfort can occur.
A few things that are especially important
Don’t stop metoprolol suddenly. Abrupt withdrawal can cause a rapid increase in heart rate and blood pressure and can worsen angina or, in some people, trigger serious heart problems. Dose reductions generally need to be gradual and supervised by a clinician.
Metoprolol can also mask some warning signs of low blood sugar, particularly a fast heartbeat, which is important for people with diabetes.
Seek urgent medical attention for fainting, severe difficulty breathing, severe chest pain, or a very slow/irregular heartbeat.
And not every symptom that occurs while taking metoprolol is necessarily caused by the medication—underlying heart disease and other medicines can produce similar symptoms.
