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Heparin, also known as unfractionated heparin, is a chemical that is produced in the liver and is found in blood clots. When these blood clots build up in the veins, it can result in blockage of the arteries.

Unfractionated heparin is majorly used in deep venous thrombosis (DVT), pulmonary embolism (PE), and venous thromboembolism (VTE) in patients with increased postoperative complications. Unfractionated heparin is the preferred treatment for patients at high risk of bleeding complications, owing to its short activity and reversibility and its reversible anticoagulant effect.