Before you begin taking a medication, be sure to inform your doctor of any
medical conditions or allergies you may have, any medications you are taking,
whether you are pregnant or breast-feeding, and any other significant facts
about your health. These factors may affect how you should take this medication.
Abnormal heart rhythms: Certain medications used to treat abnormal heart rhythms, including flecainide, may cause new abnormal heart rhythms or worsen existing ones. Your doctor will monitor you closely while you are taking flecainide. If you experience a fast, slow, or irregular heartbeat; fainting; heart palpitations; or dizziness while taking this medication, contact your doctor immediately.
Drowsiness/reduced alertness: Flecainide may cause blurred vision, dizziness, and fatigue. Do not drive or operate machinery until you know how this medication affects you.
Heart failure: Flecainide can cause or worsen heart failure and should not be used by people with severe or untreated heart failure. If you have heart failure and are taking this medication, your doctor will monitor you closely during treatment. If you notice shortness of breath, weight gain, or swelling in the hands, feet, or lower legs while taking flecainide, contact your doctor immediately. People who have had a heart attack may also develop these symptoms.
Kidney or liver problems: If you have decreased kidney or liver function
discuss with your doctor how this medication may affect your medical condition,
how your medical condition may affect the dosing and effectiveness of this medication,
and whether any special monitoring is needed.
Pregnancy: This medication should not be used during pregnancy unless
the benefits outweigh the risks. If you become pregnant while taking this medication,
contact your doctor immediately.
Breast-feeding: Flecainide passes into breast milk. If you are a breast-feeding mother and are taking this medication, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.
Children: The safety and effectiveness of using this medication have not been established for children.