Enoxaparin is used to prevent and treat harmful blood clots. Preventing harmful blood clots 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 sometimes commonly referred to as a “blood thinner,” but its more correct term is “anticoagulant.” It is a type of heparin. Conditions which increase your risk of developing blood clots include certain types of surgeries (e.g., knee or hip replacement), 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.”