Fragmin, generically known as dalteparin sodium, is a type of anticoagulant medication that belongs to the low molecular weight heparin (LMWH) class. It is primarily used to prevent and treat deep vein thrombosis (DVT) and pulmonary embolism (PE), conditions that occur when blood clots form in the deep veins of the body, potentially breaking loose and traveling to the lungs. Fragmin works by inhibiting certain factors in the blood clotting process, effectively reducing the body's ability to form harmful clots. It is often administered via subcutaneous injection and is used in various clinical settings, including after surgery to prevent clot formation, in patients with acute coronary syndrome, and in those with cancer to prevent clot-related complications. Its use must be carefully monitored by healthcare professionals to balance the risk of bleeding with the benefits of preventing clot formation.