Tonocard is a brand name for a drug called tocainide. It is used to treat irregular heartbeats and arrhythmias. There are several synonyms for Tonocard, including Lorcainide, Mexiletine, Propafenone, Quinidine, and Amiodarone. These drugs also help reduce the frequency of ventricular arrhythmias and restore the normal rhythm of the heartbeat. Each of these drugs may have different mechanisms of action and side effects, so it is important to follow your doctor's prescription and instructions carefully. If you experience any adverse effects after taking Tonocard or any of its synonyms, seek medical attention immediately.