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Medications and Drugs

Brand Names: Tambocor

Generic Name: flecainide (Pronunciation: FLEK a nide)

What is flecainide (Tambocor)?

Flecainide is in a group of drugs called Class IC anti-arrhythmics. It affects the way your heart beats.

Flecainide is used in certain situations to prevent serious heart rhythm disorders.

Flecainide may also be used for other purposes not listed in this medication guide.

Flecainide 100 mg-AMN

oval, white, imprinted with AN 643

Flecainide 100 mg-BAR

oval, white, imprinted with b, 860 100

Flecainide 100 mg-MYL

round, white, imprinted with 85 10, M

Flecainide 100 mg-ROX

round, white, imprinted with 54 070

Flecainide 150 mg-BAR

oval, white, imprinted with b, 861 150

Flecainide 150 mg-MYL

oval, white, imprinted with 85 15, M

Flecainide 150 mg-ROX

oblong, white, imprinted with 54 150

Flecainide 50 mg-AMN

round, white, imprinted with AN 641

Flecainide 50 mg-BAR

round, white, imprinted with b, 859

Flecainide 50 mg-MYL

round, white, imprinted with 85 05, M

Flecainide 50 mg-ROX

round, white, imprinted with 54 024

Tambocor 50 mg

round, white, imprinted with 3M, TR 50

What are the possible side effects of flecainide (Tambocor)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have a serious side effect such as:

  • slow heart rate, weak pulse, fainting, slow breathing (breathing may stop);
  • dizziness, fainting, fast or pounding heartbeat;
  • feeling short of breath, even with mild exertion;
  • swelling, rapid weight gain;
  • low potassium (confusion, uneven heart rate, extreme thirst, increased urination, leg discomfort, muscle weakness or limp feeling);
  • high potassium (slow heart rate, weak pulse, muscle weakness, tingly feeling);
  • pale skin, easy bruising or bleeding, unusual weakness; or
  • jaundice (yellowing of the skin or eyes).

Less serious side effects may include:

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about flecainide (Tambocor)?

You should not use this medication if you are allergic to flecainide, or if you have certain heart conditions, especially "AV block" (unless you have a pacemaker).

Before using flecainide, tell your doctor if you have congestive heart failure, a heart condition called "sick sinus syndrome," an electrolyte imbalance, liver disease, kidney disease, if you have a pacemaker, or if you have had a heart attack within the past 2 years.

You will need to receive your first few doses of flecainide in a hospital setting in case the medication causes serious side effects. Your heart rate will be constantly monitored using an electrocardiograph or ECG (sometimes called an EKG). This machine measures electrical activity of the heart.

Call your doctor at once if you have a serious side effect such as weak pulse, slow breathing, fast or uneven heartbeat, feeling like you might pass out, feeling short of breath, swelling, rapid weight gain, confusion, extreme thirst, increased urination, muscle weakness, or jaundice (yellowing of the skin or eyes).

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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