About flecainide
Class Ic antiarrhythmic
Used for
- Treats certain abnormal heart rhythms, including atrial fibrillation and ventricular arrhythmias.
Usual adult dose
Often 50–100 mg twice daily; dose depends on the rhythm and heart function.
Usual dose in children
Specialist-prescribed, weight-based dosing for selected childhood arrhythmias.
Common side effects
- Dizziness or blurred vision
- Nausea
- Shortness of breath
- Worsening or new abnormal heart rhythms
Important warnings
- Can cause serious rhythm problems; requires ECG monitoring.
- Use cautiously with heart failure, heart attack history, or kidney or liver problems.
- Do not stop suddenly without medical supervision.
- Not suitable for some people with structural heart disease.
Pregnancy
Use only when clearly needed; potential benefits and risks require specialist assessment.
Breastfeeding
Safety information is limited; use requires medical assessment.
Interactions
- Amiodarone can increase flecainide levels; dose adjustment may be needed.
- Other rhythm medicines may increase heart-related risks.
- Some antidepressants and antibiotics can raise flecainide levels.
- Digoxin levels may increase when taken with flecainide.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.