An antiarrhythmic drug is a medication used to treat an irregular heartbeat or arrhythmia. There are several other names for antiarrhythmic drugs including antiarrhythmics, heart rhythm drugs, and rate control drugs. Additionally, some specific types of antiarrhythmic drugs have their own unique names, such as beta blockers, calcium channel blockers, and potassium channel blockers. Some drugs also have dual actions and are called class Ia, class Ib, and class Ic drugs. While antiarrhythmic drugs can be effective in treating heart rhythm disorders, they also carry the risk of side effects and should only be prescribed under the supervision of a healthcare professional.