Metoprolol: 10 Side Effects to Know About
Metoprolol is a beta-blocker used for conditions such as high blood pressure, angina, heart failure, certain abnormal heart rhythms, and after some heart attacks. Most people tolerate it well, but side effects can occur. (medlineplus.gov
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10 possible side effects
Tiredness or low energy — one of the more common effects.
Dizziness or lightheadedness — particularly when blood pressure falls or when standing up.
Slow heartbeat — metoprolol deliberately slows the heart, but an excessively slow rate can be a problem.
Low blood pressure — may cause weakness, dizziness, or fainting.
Shortness of breath or wheezing — more concerning in people with asthma or other airway disease.
Diarrhea or stomach upset — digestive symptoms can occur.
Cold hands and feet — reduced circulation to the extremities can occur.
Sleep disturbances or vivid dreams — headaches, insomnia, and nightmares have also been reported.
Depression or mood/cognitive changes — depression has been reported, and confusion or short-term memory problems are possible but less common. (dailymed.nlm.nih.gov
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Sexual problems — decreased libido or erectile dysfunction can occur in some people. (dailymed.nlm.nih.gov
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A particularly important issue for people with diabetes
Metoprolol can mask some warning symptoms of low blood sugar, so people with diabetes may need to monitor glucose carefully. (medlineplus.gov
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Don’t stop metoprolol suddenly
This is one of the most important precautions. Abruptly stopping metoprolol can cause serious heart problems, including worsening angina or other cardiac complications. Any dose reduction should be planned with your prescriber. (medlineplus.gov
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When to get medical help
Contact a healthcare professional promptly for fainting, significant swelling of the legs or feet, unexplained rapid weight gain, worsening shortness of breath, or a very slow/irregular heartbeat. Severe breathing difficulty or chest pain warrants emergency care. (medlineplus.gov
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One final point: metoprolol comes in different formulations, especially metoprolol tartrate and metoprolol succinate extended-release, so dosing and schedules aren’t interchangeable. Don’t change your dose based on a side-effect list.
