Alendronic acid (INN) or alendronate sodium (USAN) — sold as Fosamax by Merck — is a bisphosphonate drug used for osteoporosis and several other bone diseases. It is marketed alone as well as in combination with vitamin D (2800 IU and 5600 IU under the name Fosamax+D). Merck’s U.S. patent on alendronate expired in 2008 and Merck lost a series of appeals to block a generic version of the drug from being certified by the U.S.
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