Amiodarone is a specialty chemical and active pharmaceutical ingredient (API), classified as a class III antiarrhythmic agent. It is an iodinated benzofuran derivative with the molecular formula C₂₅H₂₉I₂NO₃ and molecular weight of 645.97 g/mol. This high-purity compound (94.5-100%) appears as a colorless to pale yellow oil to solid and conforms to structure by infrared spectrum. It is primarily used in the synthesis and formulation of medications to treat irregular heartbeats, such as ventricular tachycardia and atrial fibrillation, by prolonging the cardiac action potential and stabilizing heart rhythm. Amiodarone is effective in cases where other antiarrhythmics fail, and is administered orally or intravenously. Due to its potency, use requires monitoring for potential toxicities affecting lungs, liver, thyroid, or eyes.