Fragmin 5000IU Injection 0.2 ml belongs to a class of drugs known as anticoagulants (blood thinner), primarily used to prevent and treat stroke risk, heart attack in patients with atrial fibrillation (irregular heart rhythm) reducing blood clot formation. Besides this, it is also used to prevent deep vein thrombosis (blood clots in leg veins) and pulmonary embolism (blood clots in the lung) and reduces the risk of getting clots in people who have undergone knee or hip replacement surgeries. A blood clot can occur in any part of the body, leading to a heart attack, stroke and damage to organs (even coma or death). Blood clots can reach your arteries or veins in the organs like the brain, kidney, heart, lungs and limbs.