Procainamide is a medication primarily used to treat certain types of irregular heartbeats, known as arrhythmias. It works by stabilizing the electrical activity in the heart, helping to restore a normal rhythm. This drug is often prescribed when other treatments are not effective or suitable. Patients taking Procainamide may experience side effects, including nausea, dizziness, or a rash. Regular monitoring by a healthcare provider is essential, as the medication can affect heart function and may require dosage adjustments. It is important for patients to discuss their medical history and any other medications they are taking with their doctor.