Anisindione is primarily used as an anticoagulant medication to prevent and treat blood clots. It works by inhibiting the synthesis of vitamin K-dependent clotting factors in the liver, thereby reducing the blood's ability to clot. This makes it effective in managing conditions such as deep vein thrombosis, pulmonary embolism, and atrial fibrillation, where the risk of clot formation is high. It is also used in patients with prosthetic heart valves to prevent thromboembolic complications. Due to its mechanism of action, careful monitoring of blood clotting parameters is required to avoid bleeding complications. Patients on anisindione therapy are often advised to maintain a consistent intake of vitamin K-rich foods and avoid sudden dietary changes to ensure stable anticoagulation levels.