Flecainide Side Effects

Possible side effects of flecainide are listed below. Tell your doctor if these side effects are severe or continue after a few days.

• Headache
• Dizziness
• Weakness
• Changes in vision
• Uncontrolled shaking of any part of the body
• Stomach pain
• Constipation

Flecainide can also cause more serious side effects. Call your doctor immediately or seek emergency medical attention if you develop the following symptoms:

• Fast, pounding, or irregular heartbeat
• Shortness of breath
• Chest pain
• Swelling of the hands, lower legs, ankles, or feet
• Extreme fatigue
• Flu-like symptoms
• Nausea
• Loss of appetite
• Right upper stomach pain
• Yellowing of the skin or eyes
• Continued cough with mucus that is blood-tinged
• Unusual bleeding or bruising
• Confusion

The above list may not include all the potential adverse effects of flecainide. Contact your healthcare professional if your side effects are unusual or severe or do not improve over time. You can also report unusual side effects to the Food and Drug Administration at 1-800-FDA-1088.

Flecainide Overdose: In case of an overdose of flecainide, call your doctor immediately. You can also call the local poison control center or national poison control center at 1-800-222-1222. Call 911 if a person cannot be awakened, has trouble breathing, has collapsed, or has had a seizure. Symptoms of flecainide toxicity may include nausea, vomiting, slow, fast, or irregular heartbeats, convulsions, loss of consciousness, and sudden cardiac death.

Source: FDA