Specialists at major medical centers confirm that a surprising number of women who've taken Fosamax or its generic form for more than five years have had fractured femurs. It's believed that while the drug at first helps prevents bone loss. Over time, it may limit the bone's ability to protect itself from stress.
The FDA says it's looking into these reports.
Merck, the drug's maker, says a relationship between Fosamax and fractures has not been established.