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.
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 metoprolol side effects may include:
dizziness, tired feeling;
depression, confusion, memory problems;
nightmares, trouble sleeping;
diarrhea; or
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)
