I personally don't see much online for osteoporosis caused by cymbalta. Yes, it can be found but certainly not a major side-effect or one that is widely posted on reputable sites like drugs.com. Actually of the 40+ side effects listed, bone loss or osteoporosis is NOT one of them. Nor is it listed in the 20+ common side-effects. The only place I could really find something was comments on forums and they were not many.

I'm not saying it isn't caused by cymbalta, but I certainly believe the risk is MUCH higher for ANY steroid use...and 20 mg of IV solu-medrol is not really a low dose. It is not a huge dose, particularly since it's just once a month, but the risk is still higher.

There are other factors that must be considered in your development of osteoporosis. Age, menopause, exercise, diet, etc. ALL of these are significant to developing this, especially coupled with steroid use and maybe the cymbalta.