Posted by dbug7857 @dbug7857, Mar 8, 2021

My EP put me on flecainide about six weeks ago 50 mg twice a day and recently upped it to 75 mg twice a day. Every time I take the flecainide about an hour or so later I go into a fib and I think the flecainide is causing it. I want to stop taking it but not sure how to wean off. Has anyone else had this problem?

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Hello @dbug7857

I read your post about the rapid heartbeat after taking Flecainide. I looked on Mayo Clinic's website and found this information about the side effects of this drug. Here is the link to that information, https://www.mayoclinic.org/drugs-supplements/flecainide-oral-route/side-effects/drg-20063854.

As you can see, the rapid heartbeat is a side effect. It is important not to taper off a med like this without your doctor's knowledge and giving you a plan for tapering. Your doctor might even give you a different prescription for a new med to take its place.

Have you contacted your provider about this side effect?


I am taking 100 mg twice a day and have no problems with it at all. I have been doing this for over a year. I am also taking 12.5 mg metoprolol twice a day which regulates my heart rate. If I have a very fast heart rate, I take a 12.5 tab of the metoprolol and within a few minutes my heart rate drops back to normal.


Taking 150mg of Flecainide twice a day for 11 years. I do have episodes of fast heartbeat, most likely a side effect of the drug, however rather have this than the AFib. Still have short runs of AFib couple times a month which pass after an hour or so and are tolerable. Have had 3 ablations and always end up back on the Flecainide. Did try Dofetiliide prior to scheduling last ablation, only kept me out of AFib for about 2 months.

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