Flecainide
Flecainide is an anti-arrhythmic medicine used for some supraventricular arrhythmias when prescribed, usually with cardiology oversight and ECG monitoring in the UK. It is not suitable for many people with significant structural heart disease — selection is specialist.
This medicine is part of the Blood pressure, cholesterol & related category.
Generic name: flecainide
Quick answers
Short replies to searches people often run before speaking to a clinician. For the overview of what the medicine is used for, see the short summary under the page title above.
What is it for?
Flecainide is an anti-arrhythmic medicine used for some supraventricular arrhythmias when prescribed, usually with cardiology oversight and ECG monitoring in the UK.
How long does it take to work?
Onset varies by condition and dose. Your GP or pharmacist can explain what to expect and when to review.
What are common side effects?
Dizziness, visual shimmer, nausea, or palpitations can occur.
Can you take paracetamol or ibuprofen with it?
Ask your GP or pharmacist before taking Flecainide with paracetamol or ibuprofen. Many adults use paracetamol for short periods when appropriate; NSAIDs such as ibuprofen need extra checks with your other medicines and health conditions.
More about what Flecainide is used for
Flecainide is an anti-arrhythmic medicine used for some supraventricular arrhythmias when prescribed, usually with cardiology oversight and ECG monitoring in the UK.
It is not suitable for many people with significant structural heart disease — selection is specialist.
How does Flecainide work, and how long does it take to work?
It slows electrical conduction in heart tissue, which can suppress some abnormal rhythms.
Pro-arrhythmic risk means careful patient selection.
How and when should you take Flecainide?
Dosing schedules vary — follow your prescription exactly. Tablets are swallowed with water.
Do not stop suddenly without cardiology advice if you take it long term.
What are the common side effects of Flecainide?
Dizziness, visual shimmer, nausea, or palpitations can occur.
Slow pulse or new syncope needs urgent review.
Serious side effects of Flecainide — when to get urgent help
Seek emergency help for sustained rapid palpitations, chest pain, or collapse — rhythm drugs can sometimes worsen rhythms.
What if you miss a dose of Flecainide?
Take when remembered unless nearly time for next; do not double.
Who should not take Flecainide?
Many post-heart-attack patients and some heart failure groups were historically excluded — modern use follows specialist criteria.
Severe kidney or liver impairment needs dose adjustment.
Can you take paracetamol or ibuprofen with Flecainide? — other interactions
Other anti-arrhythmics, beta-blockers, Digoxin, and some antibiotics interact — always carry an up-to-date medicine list.
Flecainide in pregnancy and breastfeeding
Discuss with your cardiologist before pregnancy or breastfeeding.
Blood tests and monitoring on Flecainide
ECG and sometimes drug levels or kidney function are monitored.
What might your GP prescribe instead of Flecainide?
Beta-blockers, calcium channel blockers, catheter ablation, or Amiodarone may be alternatives depending on rhythm type.
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Reviewed by UK registered pharmacists for accuracy and clarity. Content is informational only.
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Frequently asked questions about Flecainide
People also ask — common Google searches
- What is Flecainide used for?
- Flecainide is an anti-arrhythmic medicine used for some supraventricular arrhythmias when prescribed, usually with cardiology oversight and ECG monitoring in the UK. It is not suitable for many people with significant structural heart disease — selection is specialist.
- How long does Flecainide take to work?
- Onset varies by condition and dose. Your GP or pharmacist can explain what to expect and when to review. Always follow your prescriber’s follow-up plan.
- Can you take Flecainide with paracetamol or ibuprofen?
- Ask your GP or pharmacist before taking Flecainide with Paracetamol or Ibuprofen. Many adults use paracetamol for short periods when appropriate; NSAIDs such as ibuprofen need extra checks with your other medicines and health conditions.
- What are the side effects of Flecainide?
- Dizziness, visual shimmer, nausea, or palpitations can occur. Slow pulse or new syncope needs urgent review. See the sections below for more detail, including serious side effects and when to seek urgent help.
- Why do I need ECGs on flecainide?
- Your team checks for conduction slowing or pro-arrhythmia after starting or changing dose — attend appointments.
- Can flecainide cause blurred vision?
- Visual side effects are recognised; report new symptoms to your cardiology team rather than adjusting dose yourself.
Need personalised advice?
Your local pharmacist or GP surgery can help with questions about your medicines, side effects, and alternatives that may be suitable for you.
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Often used with
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