Fragmin 5000IU Injection is used to prevent deep vein thrombosis (blood clots in leg veins), pulmonary embolism (blood clots in the lung) and reduce the risk of getting clots in people who have undergone knee or hip replacement surgeries. Also, it helps to treat and prevent stroke risk, and heart attack in patients with atrial fibrillation (irregular heart rhythm). It contains Dalteparin which prevents the formation of blood clots by thinning the blood.