Dalteparin Sodium is the sodium salt of a low molecular weight, synthetic heparin. As an anticoagulant/antithrombotic agent, dalteparin binds to antithrombin and enhances the inhibition of Factor Xa. Compared to unfractionated heparins, the use of dalteparin is associated with lower incidences of osteoporosis and heparin-induced thrombocytopenia.