Etidronate Disodium is a kind of bisphosphonate bone resorption inhibitor. Such medication performs primarily on bone. It prevents the formation, development, & dissolution of hydroxyapatite crystals & their amorphous predecessors by chemisorption to the surfaces of calcium phosphate. It is well formulated with molecular formula C2H6Na2O7P2. It sucks to hydroxyapatite cells and decreases the many osteoclasts, thereby preventing abnormal bone resorption. Also, the Etidronate Disodium may directly promote bone formation by osteoblasts.