Q: Ive been taking alendronate (Fosamax) for osteoporosis for four years. Do I need to stop? If so, for how long?A: The drug you are taking is a type of drug called a bisphosphonate. There are three other drugs in this class, which are all used for the bone-thinning disease osteoporosis. They are risedronate (Actonel), ibandronate (Boniva) and zoledronic acid (Reclast).