Metoprolol: The Good, The Bad, and the UGLY — 10 Common Side Effects
Metoprolol is a beta-blocker used for conditions including high blood pressure, angina, heart failure, certain abnormal heart rhythms, and to improve survival after some heart attacks. It works partly by slowing the heart rate and reducing the heart’s workload. (MedlinePlus)
10 possible side effects
- Tiredness or fatigue — a common complaint.
- Dizziness or lightheadedness — particularly if blood pressure drops.
- Slow heart rate (bradycardia) — the drug intentionally slows the heart, but excessive slowing can be problematic.
- Low blood pressure — may cause weakness or feeling faint.
- Shortness of breath or wheezing — especially important in people with respiratory conditions. (DailyMed)
- Diarrhea or digestive symptoms — diarrhea is a recognized adverse effect.
- Dry mouth — reported with metoprolol.
- Cold hands and feet — reduced peripheral circulation can occur.
- Sleep or mood changes — depression, insomnia, nightmares, and confusion have been reported.
- Swelling or weight gain — particularly important because these can sometimes signal worsening heart failure. (MedlinePlus)
🚨 When to contact a doctor urgently
Seek prompt medical attention for difficulty breathing, fainting, significant swelling, rapid or irregular heartbeat, or unexplained rapid weight gain. (MedlinePlus)
Metoprolol can also mask some warning symptoms of low blood sugar, which is particularly important for people with diabetes. (MedlinePlus)
One very important warning
Don’t stop metoprolol suddenly on your own. Abrupt withdrawal can worsen heart problems, including ischemia and, in some circumstances, precipitate serious cardiac complications. Your prescriber should guide any dose reduction or discontinuation. (MedlinePlus)
Bottom line: Metoprolol can be highly beneficial when appropriately prescribed, and many people tolerate it well. If side effects are troublesome, talk to your doctor or pharmacist rather than stopping the medication yourself.
