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What does it do?

Flecainide is used to treat and prevent irregular heartbeats.

How should you take it?

Take flecainide as directed. You can take it with or without food.
Swallow the controlled release (CR) capsules whole with a glass of water.
Measure the liquid carefully with an oral syringe or measuring spoon.

What if you forget a dose?

If it is nearly time for your next dose, skip the missed dose and take your next dose at the usual time. Otherwise, take the missed dose as soon as you remember. Do not take two doses at the same time.

Can you take other medicines?

Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products or recreational drugs.

What side effects might you notice?

Side EffectsRecommended action

Symptoms of heart problems including: fluttering, pounding or pain in your chest, feeling your heart skips a beat, dizziness or fainting

Tell your doctor immediately

Swollen feet or legs, short of breath

Changes in vision

Tell your doctor

Dizziness

Tiredness or weakness

Stomach upset

Tell your doctor if troublesome

If you notice any other effects, discuss them with your doctor or pharmacist.

Other information:

  • Tell your doctor if you are pregnant, planning to become pregnant, or breastfeeding.
  • Smoking can change the effect of flecainide. Tell your doctor if you give up, cut down or start smoking.
  • Flecainide can impair your ability to do tasks such as driving or using machines. Alcohol makes this worse. Discuss your risk with your health professional. (search NZTA - Are you safe to drive?)
  • Store flecainide liquid as directed. Discard any leftover liquid after the expiry date on the bottle – ask your pharmacist how to do this safely.

This leaflet contains important, but not all, information about this medicine.

Prepared by the PILs Committee at Christchurch Hospital, Canterbury District Health Board, New Zealand. November 2020

For more general information about this sheet and its contents, see: What does a My Medicines sheet cover?

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About My Medicines

My Medicines Patient Information Leaflets (PILs) contain important, but not all, information about the medicines they describe.

For more information about the sheets, see: What does a My Medicines sheet cover?

My Medicines is developed by a team at the Canterbury District Health Board. Our team is made up of doctors, pharmacists, and a non-medical person to help us keep to plain language. We also discuss our information with specialist health professionals or groups when needed