Bretylium tosylate is primarily used in medical settings as an antiarrhythmic agent. It is administered to manage and treat life-threatening ventricular arrhythmias, particularly when other treatments have proven ineffective. The compound works by stabilizing the heart's electrical activity, preventing irregular heartbeats, and reducing the risk of cardiac arrest. It is often utilized in emergency situations, such as during cardiac resuscitation, to restore normal heart rhythm. Additionally, bretylium tosylate may be employed in certain cases of ventricular fibrillation or tachycardia, where rapid intervention is critical. Its use is typically reserved for acute scenarios due to its potent effects and potential side effects.