Tambocor is a brand name for the medication flecainide. It is an anti-arrhythmic drug that is used to treat certain types of irregular heartbeat, such as atrial fibrillation and atrial flutter. In addition to Tambocor, there are a few other synonyms for flecainide. One is its generic name, which is simply flecainide acetate. Another is Flecaid, which is a brand name that is sometimes used instead of Tambocor. Other potential synonyms for Tambocor might include other anti-arrhythmic drugs that are commonly used to treat these same conditions, such as amiodarone, dronedarone, and sotalol.