Low Molecular Weight Heparins (LMWHs) are anticoagulant medications derived from standard heparin. They are used to prevent and treat blood clots, particularly in conditions like deep vein thrombosis and pulmonary embolism. LMWHs have a more predictable effect than unfractionated heparin, allowing for easier dosing and monitoring. These medications work by inhibiting specific clotting factors in the blood, primarily factor Xa and thrombin. LMWHs are typically administered via injection and are favored for their safety profile and reduced risk of side effects, such as heparin-induced thrombocytopenia.