Enoxaparin is used to prevent and treat harmful blood clots. This helps to reduce the risk of a stroke or heart attack. This medication helps keep your blood flowing smoothly by lowering the activity of clotting proteins in the blood. Enoxaparin is an anticoagulant, also known as a "blood thinner." It is a type of heparin. Conditions which increase your risk of developing blood clots include certain types of surgeries (such as knee/hip replacement, abdominal), long periods of being immobile, certain types of heart attack, and a specific type of chest pain called unstable angina. For some medical conditions, enoxaparin may be used in combination with other "blood thinners."