What side effects may I notice from receiving Dofetilide?

Side effects that you should report to your doctor or health care professional as soon as possible:

-allergic reactions like skin rash, itching or hives, swelling of the face, lips, or tongue
-breathing problems
-chest pain or chest tightness
-dizziness
-signs and symptoms of a dangerous change in heartbeat or heart rhythm like chest pain; dizziness; fast or irregular heartbeat; palpitations; feeling faint or lightheaded, falls; breathing problems
-signs and symptoms of electrolyte imbalance like severe diarrhea, unusual sweating, vomiting, loss of appetite, increased thirst
-swelling of the ankles, legs, or feet
-tingling, numbness in the hands or feet
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):

-diarrhea
-general ill feeling or flu-like symptoms
-headache
-nausea
-trouble sleeping
-stomach pain

This list may not describe all possible side effects for Dofetilide. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.