Lovenox Prefilled Syringe contains Enoxaparin Sodium which is prescribed as an anticoagulant for patients that are at risk for a blood clot. This may be due to abdominal surgery, a knee or hip replacement, or any reduced mobility due to an illness. A deep vein thrombosis (DVT) occurs when a blood clot forms in veins deep in a muscle, usually in your legs. This can result in a pulmonary embolism (PE) if a piece of the clot breaks away and travels through your veins to one of your lungs. Once there, the clot can plug an artery and stop that part of your lung from working as it should.