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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,...

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What are the precautions when taking flecainide (Tambocor)?

Before taking flecainide, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney problems, liver problems, other heart problems (such as previous heart attack, heart pacemaker).

This drug may make you dizzy. Do not drive, use machinery, or do any activity that requires alertness until you are sure you can perform such activities safely. Limit alcoholic beverages.

Flecainide may cause a condition that affects the heart rhythm (QT prolongation). QT prolongation can infrequently result...

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