Low molecular weight heparin (LMWH) is a type of anticoagulant medication derived from heparin, which is a naturally occurring substance in the body. LMWH is used to prevent and treat blood clots, particularly in conditions like deep vein thrombosis and pulmonary embolism. It works by inhibiting specific clotting factors, making it effective in reducing the risk of clot formation. LMWH is typically administered via injection and has a more predictable effect compared to unfractionated heparin. This allows for easier dosing and monitoring, making it a preferred choice in many clinical settings. Common examples of LMWH include enoxaparin and dalteparin.