flecainide (Tambocor)

Brand Names: Tambocor

Generic Name: flecainide

What is flecainide (Tambocor)?

Flecainide is a Class IC anti-arrhythmic that is used in certain situations to prevent serious heart rhythm disorders.

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

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

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

Call your doctor at once if you have:

  • fast or pounding heartbeats;
  • fluttering in your chest, shortness of breath, and sudden dizziness (like you might pass out);
  • slow heart rate, weak pulse, slow breathing (breathing may stop);
  • feeling short of breath;
  • swelling, rapid weight gain;
  • pale skin, easy bruising or bleeding, unusual weakness;
  • fever, flu-like symptoms; or
  • jaundice (yellowing of the skin or eyes).

Common side effects may include:

  • dizziness;
  • vision problems;
  • trouble breathing;
  • headache;
  • nausea; or
  • feeling weak or tired.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. 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 medicine if you have a serious heart condition such as bundle branch block or AV block (without a pacemaker), or if your heart cannot pump blood properly.

You may receive your first dose in a hospital or clinic setting to quickly treat any serious side effects.

What should I discuss with my healthcare provider before taking flecainide (Tambocor)?

You should not use flecainide if you are allergic to it, or if:

  • you have a serious heart condition such as bundle branch block or AV block (unless you have a pacemaker); or
  • your heart cannot pump blood properly.

Tell your doctor if you have ever had:

It is not known whether this medicine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

It may not be safe to breast-feed while using this medicine. Ask your doctor about any risk.

How should I take flecainide (Tambocor)?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Your doctor may occasionally change your dose. Use the medicine exactly as directed.

You may receive your first few doses in a hospital or clinic setting to quickly treat any serious side effects.

Your heart rate will be monitored using an electrocardiograph or ECG (sometimes called an EKG). This will help your doctor determine how long to treat you with flecainide.

You may also need frequent blood tests to check your liver or kidney function.

Store at room temperature away from moisture, heat, and light.


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What happens if I miss a dose (Tambocor)?

Take the medicine as soon as you can, but skip the missed dose if it is almost time for your next dose. Do not take two doses at one time.

What happens if I overdose (Tambocor)?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Overdose symptoms may include nausea, vomiting, slow heart rate, fainting, or seizure (convulsions).

What should I avoid while taking flecainide (Tambocor)?

Follow your doctor's instructions about any restrictions on food, beverages, or activity.

What other drugs will affect flecainide (Tambocor)?

Tell your doctor about all your other medicines, especially:

This list is not complete. Other drugs may affect flecainide, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

Where can I get more information (Tambocor)?

Your pharmacist can provide more information about flecainide.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.

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Reviewed on 10/12/2022

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