N-Acetylprocainamide is primarily used as an antiarrhythmic agent in the treatment of cardiac arrhythmias. It works by stabilizing the heart's electrical activity, helping to maintain a regular heartbeat. This compound is particularly effective in managing ventricular arrhythmias, which are irregular heartbeats originating from the lower chambers of the heart. It is often administered when other antiarrhythmic medications are not suitable or effective. Additionally, it may be used in clinical settings to monitor and adjust dosages for patients with kidney impairment, as its metabolites are excreted renally. Its application is crucial in reducing the risk of severe complications associated with irregular heart rhythms, such as stroke or heart failure.