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Flecainide is a prescription medicine used to prevent certain abnormal heart rhythms. It belongs to the class Ic antiarrhythmic group. It can also cause dangerous rhythm changes, so a heart specialist selects and monitors its use carefully.
read more about flecainide ...Flecainide can prevent certain episodes of supraventricular tachycardia and symptomatic paroxysmal atrial fibrillation or flutter in selected patients. It is also used for certain life-threatening ventricular arrhythmias. The patient's heart structure and history affect whether it is appropriate.
Flecainide slows the electrical signals that travel through heart muscle. This can prevent an abnormal rhythm from starting or continuing. The same effect can worsen an existing rhythm problem or create a new one in some patients.
Flecainide is taken by mouth according to an individualized prescription. A clinician can use electrocardiograms and other tests to assess its effects. Treatment for a serious ventricular rhythm may need to begin in a hospital.
Dizziness and visual changes can occur. More serious risks include a new or worsening arrhythmia and worsening heart failure. Tell the prescriber about a prior heart attack, structural heart disease, and all other heart medicines.
Yes. It can cause a new abnormal rhythm or worsen an existing one. Contact the treating team promptly about fainting or a significant change in heartbeat.
No. Its labeling says it should not be used in patients with a recent myocardial infarction. A heart specialist assesses other heart conditions before prescribing it.
They show how flecainide affects electrical conduction through the heart. The results help guide treatment and detect safety concerns.
No. Dose changes can affect heart rhythm. Follow the schedule set by the prescriber.
FLEC - Overview: Flecainide, Serum. Mayo Clinic Laboratories. https://www.mayocliniclabs.com/test-catalog/overview/9243. Date Accessed October 6, 2026.
Flecainide. MedlinePlus. https://medlineplus.gov/druginfo/meds/a608040.html. Date Accessed October 6, 2026.
Flecainide. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK542291/. Date Accessed October 6, 2026.
Flecainide (oral route) - Side effects & dosage. Mayo Clinic. https://www.mayoclinic.org/drugs-supplements/flecainide-oral-route/description/drg-20063854. Date Accessed October 6, 2026.
Flecainide: Uses, Drug Information and Side Effects. Cleveland Clinic. https://my.clevelandclinic.org/health/drugs/17006-antiarrhythmic-medications-flecainide. Date Accessed October 6, 2026.