Two recently released studies have found that a popular drug to fights osteoporosis may increase the risk of bones breaking if taken for more than five years. Doctors say that the bisphosphonates drugs initially work well to halt bone deterioration, but for some reason begin to have the opposite effect after a number of years. The largest occurrence of the drugâ??s failure happens in post-menopausal women, USA Today reported. The FDA is analyzing the affects of the drugs, but doctors say that much more research is needed to find the cause.