Answer
Treat this as an emergency even without immediate symptoms. Contact emergency services or attend an emergency department and take the packaging if possible.
Sources for this answer
- Flecainide Acetate 50 mg tablets — Current selected SmPCemc · Summary of Product Characteristics
- Flecainide Acetate 50mg/5ml Oral Solution — Current selected SmPCemc · Summary of Product Characteristics
- Flecainide Acetate 25mg/5mL Oral solution — Current selected SmPC