Metoprolol side effects can vary a bit by formulation (tartrate vs. succinate) and dose, but many people notice similar effects at 50 mg. Here’s a concise overview:
Common and usually milder
- Fatigue or tiredness
- Dizziness or lightheadedness
- Slow heartbeat (bradycardia) or low blood pressure
- Cold hands/feet
- Nausea, upset stomach, diarrhea or constipation
- Headache
- Sleep problems (trouble sleeping, vivid dreams)
Less common but more noticeable
- Sexual problems (decreased libido, erectile or ejaculation issues)
- Mental/mood changes (fatigue can be associated with mood changes in some)
Less common but possible and should prompt contact with a clinician
- Severe or worsening dizziness, fainting
- Very slow heartbeat or signs of heart block
- Worsening heart failure symptoms (swelling, rapid weight gain, unusual shortness of breath)
- Bronchospasm or wheezing (especially if you have asthma/COPD; metoprolol is cardioselective but can affect airways at higher doses)
- Severe allergic reaction (rash with swelling, trouble breathing)
Serious but rare
- Severe liver or blood problems (jaundice, unusual bleeding/bruising)
- Severe allergic reactions
Important notes and tips
- Do not stop metoprolol suddenly; tapering under a clinician’s guidance is important to avoid rebound heart rate and blood pressure rise or chest pain.
- Take as prescribed. If you’re on an extended-release form (succinate), swallow whole; do not crush or chew.
- It can interact with other blood pressure meds, some diabetes medications (masking low blood sugar symptoms), alcohol, and certain heart rhythm drugs. Discuss all medications you take with your doctor.
- If you have asthma/COPD or thyroid problems, tell your doctor, as these conditions can influence how metoprolol is used.
- Pregnancy/breastfeeding: discuss with a healthcare provider.
If you’re experiencing symptoms you think are side effects, or if you have any of the more serious warning signs (severe dizziness, fainting, chest pain, trouble breathing, swelling of legs, or an allergic reaction), contact your clinician or seek urgent care.
If you’d like, tell me:
- Are you taking metoprolol tartrate or metoprolol succinate (and is it 50 mg once daily, twice daily, etc.)?
- What condition is it being used for (high blood pressure, angina, arrhythmia, heart failure)?
- Any side effects you’re experiencing right now?