I am a 44 year old that was diagnosed with osteopenia/osteoporosis at 30. It was determined that this was idiopathic and I have been tested for numerous other issues, but no underlying cause has been found. I was on Fosamax for 8 years and discontinued use two years ago. My spine has been stable for several years, but my hip showed a decrease of 4.6% from the DEXA in 2011 to the DEXA in 2012. My current BMD for the hip is .772 with a T Score of -1.9 and a Z Score of -1.6. My doctor has recommended Reclast. I had some stomach irritation with Fosamax. Does this seem extreme? Are there premenopausal women that have taken Reclast? If so, with what side effects or results?