Metoprolol is a beta-blocker that affects the heart and circulation (blood
flow through arteries and veins).

Metoprolol is used to treat angina (chest pain) and hypertension (high blood
pressure).

Metoprolol is also used to lower your risk of death or needing to be
hospitalized for heart failure.

Metoprolol **injection** is used during the early phase of a heart attack to
lower the risk of death.





Get emergency medical help if you have **signs of an allergic reaction to
metoprolol:** hives; difficulty breathing; swelling of your face, lips,
tongue, or throat.

**Metoprolol may cause serious side effects. Call your doctor at once if you
have:**

  * very slow heartbeats;
  * a light-headed feeling, like you might pass out;
  * shortness of breath (even with mild exertion), swelling, rapid weight gain; or
  * cold feeling in your hands and feet.

**Common side effects of metoprolol may include:**

  * dizziness;
  * tired feeling;
  * depression;
  * confusion;
  * memory problems;
  * nightmares;
  * trouble sleeping;
  * diarrhea;
  * mild itching or rash.

This is not a complete list of side effects and others may occur. Call your
doctor for medical advice about side effects. You may report side effects to
FDA at 1-800-FDA-1088.

Metoprolol side effects (more detail)