http://www.rxboomer.com/articles/Bisphosphonates_Summary.html Bisphosphonates are a class of non-hormonal drugs used to prevent and treat osteoporosis by mimicking the structure of pyrophosphate which is a component normal bones have, and inhibiting of bone-eroding cells known as osteoclasts to allow osteoblasts, bone-building cells, to work better and build healthy bones. This, consequently, increases bone density and prevents vertebral fractures. Some bisphosphonates are alendronate, etidronate and risedronate. To learn more about the benefits of this medication, read our articles. en-us