10 Often-Overlooked Metoprolol Side Effects
Metoprolol is a beta-blocker used for conditions including high blood pressure, angina, heart failure, abnormal heart rhythms, and after some heart attacks. Its benefits can be substantial, but side effects deserve attention.
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Unusual tiredness — reduced energy is one of the more commonly reported effects.
Dizziness or lightheadedness — particularly when blood pressure becomes too low.
Slow heart rate — metoprolol intentionally slows the heart, but excessive slowing can be problematic.
Cold hands and feet — reduced peripheral circulation can make the extremities feel unusually cold.
Shortness of breath or wheezing — particularly important in people with asthma or other bronchospastic conditions.
Diarrhea or digestive upset — gastrointestinal effects can occur.
Sleep or mood changes — depression and sleep disturbances have been reported.
Skin reactions — itching or rash can occur.
Low blood sugar warning signs can be masked — this is particularly important for people with diabetes because beta-blockers can hide some symptoms of hypoglycemia.
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Worsening heart-failure symptoms — new or increasing swelling, unexplained weight gain, or increasing shortness of breath should be reported promptly.
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A very important warning
Never stop metoprolol suddenly without medical advice. Abrupt withdrawal can cause serious heart problems, including worsening angina or other cardiac complications.
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Also, metoprolol can interact with other medicines. For example, some drugs can increase its concentration, while combinations with medicines such as verapamil or diltiazem can increase the risk of an excessively slow heart rate.
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When to seek urgent help
Seek urgent medical attention for severe difficulty breathing, fainting, significant swelling, sudden unexplained weight gain, or a rapid/irregular heartbeat.
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One important detail: metoprolol tartrate and metoprolol succinate extended-release are different formulations, with different dosing schedules. Don’t change the dose or timing based on an online list.
MedlinePlus: Metoprolol information
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