Before taking flecainide,
tell your doctor and pharmacist if you are allergic to flecainide or any other medications.
tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: acetazolamide (Diamox); amiodarone (Cordarone, Pacerone); ammonium chloride; antacids; beta blockers such as atenolol (Tenormin), labetalol (Trandate), metoprolol (Lopressor, Toprol XL), nadolol (Corgard), and propranolol (Inderal); carbamazepine (Carbatrol, Tegretol); cimetidine (Tagamet); clozapine (Clozaril); dichlorphenamide; digoxin (Lanoxin); diltiazem (Cardizem, Tiazac); disopyramide (Norpace); methazolamide; nifedipine (Adalat, Procardia); phenytoin (Dilantin); phenobarbital; quinidine; sodium bicarbonate (baking soda, Citrocarbonate, Soda Mint); and verapamil (Calan, Verelan). Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
tell your doctor if you have heart block (condition in which electrical signals are not passed normally from the upper chambers of the heart to the lower chambers). Your doctor may tell you not to take flecainide.
tell your doctor if you have a pacemaker (device that is surgically placed under the skin to control irregular heartbeats) and if you have or have ever had a heart attack, heart failure, or any type of heart disease; low or high levels of potassium in the blood; or liver or kidney disease. Also tell your doctor if you follow a strict vegetarian diet.
tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking flecainide, call your doctor.
if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking flecainide.
if you are giving this medication to an infant, be sure to talk to the doctor if there will be any major changes in the amount of milk the infant drinks. Milk can affect how the medication is absorbed in the body.