Generic name: Flecainide acetate.

Tambocor is an anti-arrhythmic. It alters nerve impulses within the heart to regulate heartbeat. 

Quick Facts About Tambocor


Used to treat certain heart rhythm irregularities, such as paroxysmal atrial fibrillation (sudden attack or worsening of irregular heartbeat in which upper chamber of the heart beats irregularly and very rapidly); and paroxysmal supraventricular tachycardia (sudden attack or worsening of abnormally fast but regular heart rate occurring intermittently).

Tambocor Dosage

Usually Tambocor therapy is started in the hospital. Once you are out of the hospital, you must follow your doctor’s instructions carefully or you are at risk for serious heartbeat disturbances.

  • Usual adult dose: 50 to 100 milligrams taken every 12 hours. Doctor may increase dose every 4 days by 50 milligrams every 12 hours until condition is stabilized. If you have alkaline urine as a result of being a vegetarian or have a kidney disorder, you may need a lower dosage, as Tambocor will be processed and eliminated at a slower pace in the body.
  • Usual child dose: not generally prescribed for children.
  • Missed dose: take as soon as possible, if within 6 hours of next dose. Otherwise, do not take missed dose; go back to regular schedule. Do not double doses.

Tambocor Side Effects

Overdose symptoms:

slowed or rapid heartbeat, other cardiac problems, fainting, low blood pressure, nausea, vomiting, convulsions, and heart failure. If you suspect an overdose, immediately seek medical attention.

Moderate overdose can be fatal.

More common side effects: congestive heart failure, heart block, heart attack, new or worsened heartbeat abnormalities. Other side effects: abdominal pain; angina (crushing chest pain); anxiety; apathy; appetite loss; chest pain; confusion; constipation; convulsions; decreased sex drive; depression; diarrhea; difficult or labored breathing dizziness; dry mouth; edema (fluid accumulation in tissues); exaggerated feeling of well-being excessive urine; eye pain or irritation; faintness; fainting; fatigue; fever; flushing gas; hair loss; headache; heart palpitations; high or low blood pressure; hives; impotence; inability to urinate; indigestion; insomnia; intolerance of light; involuntary eye movements; itching; joint pain; lack of coordination; loss of sense of identity; lung inflammation or other conditions; malaise (feeling ill); memory loss; morbid dreams; muscle pain; nausea; numbness or tingling paralysis; rash; reduced sensitivity to touch; ringing in the ears; skin inflammation and peeling sleepiness; speech problems; stupor; sweating; swollen lips, tongue, or mouth; taste changes; tremor; twitching vertigo; vision problems (blurred vision, difficulty focusing, double vision, spots before eyes); vomiting weakness; wheezing.

No known less common or rare Tambocor side effects.


Inform your doctor before combining Tambocor with:

amiodarone (Cordarone); beta-blockers such as Inderal, Tenormin, and Sectral; carbamazepine (Tegretol); cimetidine (Tagamet); diltiazem (Cardizem); disopyramide (Norpace); nifedipine (Procardia); phenobarbital; phenytoin (Dilantin); verapamil (Calan or Isoptin).

No known food/other substance interactions. 

Special Cautions

If pregnant or planning to become pregnant, inform your doctor immediately. Appears in breast milk; could affect a nursing infant.

No special precautions apply to seniors.

Not generally prescribed for children.

  • Doctor , should carefully explain risks of taking Tambocor before prescribing. Can cause or worsen heartbeat irregularities and heart failure.
  • A high or low level of potassium should be stabilized before starting Tambocor.
  • At increased risk for severe cardiac side effects if you have a history of congestive heart failure or a weak heart
  • If you wear a pacemaker, it may need to be adjusted; doctor will closely monitor.
  • In the case of liver disease, doctor will monitor your blood. Tambocor can build up in your body.
  • Doctor will closely monitor if you have kidney failure.


HealthSurvey.org provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Tambocor side effects, please contact your healthcare provider