Acecainide is a medication used to treat heart arrhythmia. When searching for synonyms for the term, there are different ways to approach it. One way is to look for synonyms for "heart arrhythmia" itself, which include irregular heartbeat, palpitations, dysrhythmia, and cardiac disarray. Another way is to search for related medications, such as flecainide, propafenone, and sotalol. It is important to note that while these medications may treat similar conditions, they may have different mechanisms of action and potential side effects. Consulting with a healthcare provider is always recommended before starting any new medication.