Caution about Bone drugs

The FDA has released new guide lines saying that prolonged use of bisphosphonates drugs could have negative side effects. In certain cases the prolonged use of these drugs could actually lead to weakening of bones and increased risk of esophageal cancer, femur fracture, and destruction of the jawbone.

http://well.blogs.nytimes.com/2012/05/09/new-cautions-about-long-term-use-of-bone-drugs/