Answer
Not without professional oversight. Flecainide has a narrow therapeutic range, and liquids differ in concentration, excipients and measuring device.
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