Phenprocoumon is primarily used as an anticoagulant medication to prevent and treat blood clots. It is commonly prescribed for conditions such as deep vein thrombosis, pulmonary embolism, and to reduce the risk of stroke in patients with atrial fibrillation or heart valve replacements. By inhibiting the synthesis of vitamin K-dependent clotting factors, it helps maintain blood flow and prevents the formation of harmful clots. It is often used in long-term therapy for patients requiring consistent anticoagulation management. Regular monitoring of blood clotting levels is essential to ensure its effectiveness and minimize the risk of bleeding complications.