Flecainide is used for heart rhythm problems. Verapamil is another medicine for the heart, so it is on the list of medicines you must tell your doctor or pharmacist about if you take flecainide. Tell them before you start, even if you only took verapamil recently or may need it soon. The same goes for any other medicine you take, including ones you buy without a prescription. Do not start or stop either medicine on your own. Let your doctor decide how they should be used together.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.