Ibutilide is primarily used in the medical field for the treatment of certain types of irregular heartbeats, specifically atrial fibrillation and atrial flutter. It works by affecting the electrical activity in the heart, helping to restore a normal heart rhythm. This drug is typically administered intravenously in a hospital setting under close monitoring, as it can cause serious side effects such as life-threatening arrhythmias. Its application is crucial in acute care scenarios where rapid conversion to a normal sinus rhythm is necessary.