About flecainide acetate
Class Ic antiarrhythmic
Used for
- Treats certain serious abnormal heart rhythms, including atrial fibrillation and ventricular arrhythmias.
Usual adult dose
Often 50–100 mg twice daily; dosing depends on the rhythm and requires specialist supervision.
Usual dose in children
Specialist-calculated dosing based on weight and heart rhythm; used only for selected arrhythmias.
Common side effects
- Dizziness or visual disturbances
- Nausea
- Shortness of breath
- New or worsening abnormal heart rhythms
Important warnings
- Can cause dangerous arrhythmias; requires ECG monitoring.
- Usually avoided after a heart attack or with significant structural heart disease.
- Dose may need adjustment for kidney or liver problems.
- Do not stop or change treatment without medical supervision.
Pregnancy
Use only when clearly needed; evidence is limited, and treatment requires specialist assessment.
Breastfeeding
Flecainide enters breast milk. Use requires clinical assessment and monitoring for effects in the infant.
Interactions
- Amiodarone can raise flecainide levels; dose adjustment and monitoring may be needed.
- Some antidepressants, including fluoxetine and paroxetine, can increase flecainide levels.
- Digoxin levels may rise; monitoring may be needed.
- Other medicines affecting heart rhythm can increase arrhythmia risk.
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 It may be incomplete or out of date.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.