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Medicines flecainide acetateQuestion & answer

flecainide acetate · Medicine question

Can flecainide acetate make an arrhythmia worse?

iatroX medicinesMedicine guide reviewed 20 August 2026

The answer

Answer

Yes. It can worsen an existing rhythm disorder or cause a new one, which is why specialist selection and ECG monitoring matter.

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

emc · Summary of Product Characteristics

General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.

The full medicine guide

flecainide acetate

Read the wider context, including uses, precautions and the sources behind this medicine guide.

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More questions about flecainide acetate

Why are ECGs needed?Can the oral solution make the mouth numb?Can tablets and liquids be switched directly?Can it affect driving?What should I do after taking too much?Can it be used with a pacemaker?