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Flecainide Side Effects

Common Side Effects

Flecainide has been studied extensively in clinical trials. In these studies, the side effects that occurred in a group of people taking flecainide were carefully recorded, so it was possible to see which side effects occurred and how often they happened.
In these studies, the most common flecainide side effects included:
  • Dizziness, lightheadedness, or faintness -- in up to 18.9 percent of people
  • Vision problems (including blurred vision, difficulty focusing, and seeing spots) -- up to 15.9 percent
  • Irregular, rapid, or skipped heartbeats -- up to 13 percent
  • Shortness of breath -- up to 10.3 percent
  • Headache -- up to 9.6 percent
  • Nausea -- up to 8.9 percent
  • Fatigue -- up to 7.7 percent
  • Chest pain -- up to 5.4 percent
  • Loss of strength -- up to 4.9 percent
  • Tremor (shakiness) -- up to 4.7 percent.
Other common side effects, occurring in 1 percent to 4.4 percent of people, included:
  • Constipation
  • Fluid retention (edema)
  • Abdominal (stomach) pain
  • General feelings of discomfort
  • Fever
  • Vomiting
  • Diarrhea
  • Heartburn or indigestion
  • Loss of appetite
  • Rash
  • Numbness, tingling, burning, or pricking sensations of the skin
  • Loss of muscle coordination
  • Sudden warmth and redness of the face, neck, or upper chest (flushing)
  • Increased sweating
  • Whirling or spinning sensation
  • Fainting
  • Drowsiness
  • Ringing in the ears
  • Anxiety
  • Insomnia
  • Depression.

Final Thoughts

You may experience some or none of the flecainide side effects listed in this article. Unfortunately, there is no way for your healthcare provider to know beforehand if you will have problems with a medicine that you have never tried.
Therefore, make sure to let your healthcare provider know if you develop any side effects while taking flecainide or if something "just does not seem right." While it may not be related to the medication, your healthcare provider will be able to diagnose and treat the problem.
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Flecainide Acetate Information

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