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How Does Flecainide Work?

Flecainide acetate (Tambocor™) is prescribed to prevent certain heart rhythm problems in adults. But how does flecainide work to stabilize the heart rate?
As a type of Class I antiarrhythmic medication, flecainide works by blocking sodium channels in the heart. This slows down the speed at which electrical impulses move through the heart, which helps stabilize the heart rhythm.
An arrhythmia occurs when something goes wrong with the electrical system of the heart, which normally controls the rate and rhythm of each heartbeat. Flecainide is used in people who have one of the following arrhythmias:
(For more details on how this medicine works, click Flecainide. This resource takes a closer look at what this prescription drug is used for, potential side effects, and dosing instructions.)
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