Medicines & Supplements A to Z > Flecainide


Last updated on 06/07/2021.

Overview   |   Dosage   |    Side Effects   |   Precautions  |   Tips  |   Where To Buy  

GENERIC NAME: Flecainide



DRUG CLASS: Antiarrhythmics (Class IC)

SUB CLASS: Sodium channel blockers

USED FOR: Supraventricular arrhythmia, Ventricular arrhythmia

– 100mg (tablets)
– 100mg, 200mg (capsules)

What is Flecainide for?

Flecainide belongs to a class of medications called sodium channel blockers. It is also classified as a Class I antiarrhythmic drug. It is used to treat certain types of abnormal heartbeats, including supraventricular arrhythmia (e.g. atrial fibrillation) and ventricular arrhythmia (e.g. ventricular tachycardia).

How to use it?

Flecainide can be taken orally as tablets and capsules. The usual initial dose is 50 mg twice daily. You may increase the dose by 50 mg at intervals of 4 days to a maximum daily dose of 300 mg.

What are the side effects of Flecainide?

Common side effects of Flecainide include dyspnea, headache, nausea, and fatigue.

Who should not take Flecainide?

– People who are allergic to Flecainide or any component of the formulation
– Patients with cardiogenic shock, second- or third-degree heart block

Pharmacist Tips:

– You may be hospitalized when you begin the treatment or receive the first dose.
– Continue taking Flecainide even when you feel well.

Common dosing schedule:
Flecainide can be taken with or without food. 

This schedule is for reference only, adjustments may be made according to individual needs.

Some common medications Flecainide may interact with:
– Antivirals e.g. Ritonavir
– Antiarrhythmics, e.g. Amiodarone
– Antibiotics, e.g. Clarithromycin, Erythromycin

Please notify your doctor or pharmacist if you are taking the above medication, dosage adjustments might be needed.

Where to buy Flecainide in Hong Kong?

In Hong Kong, Flecainide is a prescription only medicine, and requires a prescription from a doctor to be purchased in a pharmacy. It can also be obtained from doctors. To find a pharmacy near you, refer to the list of pharmacies (“Authorized Sellers of Poisons”) from the Hong Kong Department of Health.

For more information about drug names and ingredients, you can visit Hong Kong’s Drug Office at

Need more information?

For detailed information about the use of Flecainide in children, pregnancy and breastfeeding, and for questions about drug interactions, please check with your pharmacist or doctor.

Disclaimer: our goal is to provide you with the most relevant drug information and common dosage for Hong Kong. This information does not constitute medical advice. For specific treatment recommendations and advice, always discuss with your doctor or pharmacist, and follow the instructions included with your specific medicine.