10 Common or Important Metoprolol Side Effects
metoprolol is a beta-blocker commonly used for high blood pressure, angina, certain heart-rhythm problems, heart failure, and after a heart attack. It slows the heart rate and reduces the heart’s workload.
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Possible side effects include:
Tiredness or fatigue — particularly when starting treatment or after a dose increase.
Dizziness or lightheadedness — especially when standing up, because blood pressure can fall.
Slow heartbeat (bradycardia) — one of the medication’s intended effects can become excessive.
Low blood pressure — which may cause weakness, dizziness, or fainting.
Shortness of breath — this can occur and should be taken seriously, particularly in someone with heart or lung disease.
Diarrhea or other stomach upset.
Cold hands and feet — reduced circulation to the extremities can occur.
Sleep or mood changes — depression, insomnia, nightmares, confusion, or memory problems have been reported.
Skin reactions — itching or rash can occur.
Sexual difficulties — decreased sexual function has been reported with beta-blockers.
The official prescribing information lists tiredness, dizziness, depression, shortness of breath, slow heart rate, low blood pressure, diarrhea, itching, and rash among the most common adverse reactions.
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🚨 When to seek medical help
Contact a clinician promptly for fainting, significant swelling of the legs or feet, unexplained rapid weight gain, worsening shortness of breath, or an unusually slow/irregular heartbeat.
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Metoprolol can also mask some warning symptoms of low blood sugar, which is particularly important for people with diabetes.
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Don’t stop metoprolol suddenly
This is especially important. Abruptly stopping metoprolol can cause serious heart problems, including worsening angina or myocardial ischemia. Any dose reduction or discontinuation should be planned with the prescribing clinician.
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If you’re taking metoprolol and experiencing a particular symptom—such as fatigue, dizziness, slow pulse, shortness of breath, or memory problems—tell me the symptom, your dose, and whether you take metoprolol tartrate or succinate, and I can explain how likely it is to be medication-related.
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