Follow these steps when using Flecainide:

1. Take the tablet by mouth with a glass of water.
   
   
2. You can take it with or without food, but try to take it the same way every day.
   
   
3. Take the medicine at the same time each day to keep a steady level in your body.
   
   
4. Do not crush or chew the tablet unless your doctor says it’s okay.
   
   
5. If you miss a dose, take it as soon as you remember. If it’s almost time for your next dose, skip the missed one. Do not double the dose.
   
   
6. Do not stop taking Flecainide suddenly unless told by your doctor.
   
   

Regular check-ups and heart tests (like ECGs) are important while using this medicine.

Your heart beats because of electrical signals that tell it when to contract. In some people, these signals go wrong and cause the heart to beat too fast or unevenly. This is called an arrhythmia.

Flecainide works by slowing down the electrical signals in the heart. This helps the heart return to a normal rhythm and beat more regularly.

It also helps prevent future episodes of irregular heartbeat, so it is often taken as a long-term treatment.

Like all medicines, Flecainide can cause side effects. Not everyone will get them, and some are mild.

Common Side Effects:

• Dizziness or light-headedness
  
  
• Headache
  
  
• Nausea (feeling sick)
  
  
• Blurred vision
  
  
• Tiredness
  
  

Serious Side Effects:

• Worsening of irregular heartbeat
  
  
• Chest pain
  
  
• Fainting
  
  
• Shortness of breath
  
  
• Swelling in the feet or legs
  
  
• Signs of allergic reaction (rash, itching, swelling)
  
  

Call your doctor immediately if you have any serious side effects or feel that your symptoms are getting worse.

Flecainide is a strong medicine and must be used with care.

• Do not use if you have certain heart conditions like second or third-degree heart block or severe heart failure, unless you have a pacemaker.
  
  
• Tell your doctor if you have kidney or liver problems.
  
  
• Use carefully if you have had a heart attack or other serious heart disease.
  
  
• You may need regular heart check-ups and blood tests.
  
  
• Avoid alcohol while on Flecainide, as it may increase side effects.
  
  
• Do not drive or use machines if you feel dizzy or tired.
  
  
• Pregnant or breastfeeding women should only use it if a doctor says it’s safe.
  
  

Flecainide can interact with several other medicines, including:

• Beta-blockers (like metoprolol)
  
  
• Calcium channel blockers (like verapamil)
  
  
• Digoxin
  
  
• Antidepressants
  
  
• Other antiarrhythmics
  
  

It may also interact with grapefruit juice, which should be avoided.

Always tell your doctor about all medicines, supplements, or herbal products you are taking.

Here are basic dosage guidelines, but remember: only a doctor can decide the right dose for you.

Adults:

• Starting dose: 50 to 100 mg every 12 hours
  
  
• Maintenance dose: Adjusted based on heart rhythm and side effects
  
  
• Maximum dose: 400 mg per day
  
  

Children:

• Dose depends on body weight
  
  
• Must be carefully monitored by a pediatric heart specialist
  
  

If you take too much Flecainide, seek emergency help immediately. Overdose can cause serious heart rhythm problems.

Flecainide is a prescription-only medicine. You cannot buy it over the counter.

• You need a heart test (ECG) and a full check-up before starting this medicine.
  
  
• Only a qualified doctor can decide if Flecainide is safe for you.
  
  
• You must be monitored closely while on this medicine to check for side effects or changes in heart rhythm.
  
  
• Never share this medicine with others, even if they have the same symptoms.

• What is Flecainide used for?
  It is used to treat and prevent certain serious heart rhythm disorders, including:

  • Paroxysmal supraventricular tachycardia (PSVT)

  • Atrial fibrillation (AF) and atrial flutter (in patients without structural heart disease)

  • Ventricular tachycardia (VT) in life-threatening cases

  • Wolff–Parkinson–White (WPW) syndrome and other accessory pathway arrhythmias

• What are the brand names?

  • Tambocor® (brand)

  • Flecainide (generic versions widely available)

• What is the active ingredient?
  Flecainide acetate.

• How does Flecainide work?

  • It is a Class IC antiarrhythmic that blocks fast sodium (Na⁺) channels in cardiac cells.

  • This slows conduction and stabilizes cardiac electrical activity, restoring a normal rhythm.

  • It reduces abnormal impulses responsible for arrhythmias.

• What type of medication is it?
  A Class IC antiarrhythmic agent (membrane-stabilizing drug).

• How is Flecainide taken?

  • By mouth, as tablets.

  • Typical adult starting dose: 50 mg every 12 hours, adjusted based on response and ECG monitoring.

  • Maximum dose usually 300 mg/day (lower in kidney impairment).

  • Always taken at regular intervals, with or without food.

• What forms and strengths are available?

  • Tablets: 50 mg, 100 mg, and 150 mg.

  • Oral solution (rarely used, for pediatric or special cases).

• How long does it take to work?

  • Usually begins working within 1 to 6 hours after dosing.

  • Full stabilization of rhythm may take 1 to 2 days of steady therapy.

• What are the common side effects?

  • Dizziness or light-headedness

  • Blurred or double vision

  • Headache

  • Nausea

  • Fatigue

• Are there serious side effects?
  Yes — report immediately if you experience:

  • New or worsening arrhythmia (proarrhythmic effect)

  • Chest pain or shortness of breath

  • Swelling in legs or ankles (heart failure symptoms)

  • Fainting or severe dizziness

  • Seizures or confusion

  • Allergic reaction (rash, swelling, trouble breathing)

• Who should not take Flecainide?

  • People with structural heart disease, previous myocardial infarction, or heart failure (risk of sudden death)

  • Those with second- or third-degree AV block, unless they have a pacemaker

  • Hypersensitivity to Flecainide

  • Patients with cardiogenic shock

• Can it be used in children?
  Yes — under specialist supervision, with weight-based dosing and close ECG monitoring.

• Can it be used during pregnancy?
  Use only if the potential benefit justifies the risk; may be considered in life-threatening arrhythmias.

• Can it be used while breastfeeding?
  Not recommended — Flecainide passes into breast milk; discuss alternatives with your doctor.

• Does Flecainide interact with other medications?
  Yes — important interactions include:

  • Amiodarone, quinidine, or verapamil → may increase Flecainide levels and toxicity risk.

  • Beta-blockers → additive effects on heart rate and conduction.

  • Digoxin → Flecainide increases digoxin blood levels.

  • Cimetidine → increases Flecainide concentration.

  • Avoid combining with other Class I or III antiarrhythmics without cardiologist approval.

• What monitoring is required?

  • Regular ECG (electrocardiogram) to check QRS duration and rhythm stability.

  • Kidney and liver function tests to adjust dosing.

  • Plasma drug level monitoring in some cases.

• How should I store Flecainide?

  • Store at room temperature (20 °C–25 °C / 68 °F–77 °F).

  • Keep tightly closed and away from moisture and light.

• Is there a generic available?
  Yes — Flecainide acetate is widely available as a generic.

• Where can I get it?
  Available by prescription only at pharmacies.