Used primarily in the treatment of atrial fibrillation, particularly in patients with recent-onset episodes. It is administered intravenously in hospital settings to restore normal sinus rhythm. Its mechanism involves blocking specific cardiac ion channels, which helps stabilize heart rhythm without significantly affecting ventricular conduction. Due to its short half-life and favorable safety profile in controlled environments, it is preferred in acute care where rapid conversion to sinus rhythm is desired. Not recommended for patients with severe structural heart disease or hypotension.