The osteoporosis drug zoledronic acid is known by the brand name Reclast in the United States and Aclasta to the rest of the world.   Zoledronic acid is often prescribed for those who've already tried other bisphosphonates, but who were forced to discontinue them because of gastrointestinal side effects. In particular, those whose bone loss is especially severe, leaving them at high risk of fracture if no medication is given, could benefit from treatment with this drug. In addition, relatively younger women -- in their late 50s or early 60s -- whose bone density testing already indicates serious trouble for their age might find this course of medication useful.   For more information about zoledronic acid (Reclast/Aclasta), see:   Reclast Once a Year: When to Discuss It with Your Doctor http://www.healthcentral.com/osteoporosis/c/9487/12610/year-acid   How to Talk to Your Doctor about Reclast for Osteoporosis Treatment  http://www.healthcentral.com/osteoporosis/c/9487/12611/talk-acid   Reclast vs. Fosamax, Boniva and Actonel  http://www.healthcentral.com/osteoporosis/c/73/13598/reclast-acid