Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
chest pain;
fast or pounding heartbeats, fluttering in your chest;
sudden dizziness (like you might pass out);
slow heartbeats (especially if you feel light-headed);
swelling, rapid weight gain; or
feeling short of breath.
Common side effects may include:
slow heartbeats;
trouble breathing;
dizziness; or
feeling weak or tired.
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.
 Sotalol side effects (more detail)
