Azimilide Dihydrochloride is primarily used as an antiarrhythmic agent, specifically for the treatment of cardiac arrhythmias. It works by blocking multiple ion channels in the heart, including potassium and calcium channels, which helps to stabilize the heart's electrical activity and prevent irregular heartbeats. This makes it effective in managing conditions like atrial fibrillation and ventricular arrhythmias. Its ability to prolong the action potential duration and refractory period in cardiac cells contributes to its therapeutic effects. It is often considered for patients who do not respond well to other antiarrhythmic medications.