Bisphosphonates: Bone Strengtheners or Bone Hardeners?

Bisphosphonates are now the most widely marketed and prescribed patented, FDA-approved anti-osteoporosis drugs. Bisphosphonates mimic, to some extent, the effects of estrogen on bone in that they work by inhibiting bone resorption [the process by which old bone is removed to make room for new bone]. However, like estrogen, these drugs have no ability to build new bone.