To all-when combo protocol was mentioned I thought it was going to be something I had heard about , but it was not .HOWEVER, I tripped over this video of information and maybe you can as well . it was from a Dr. Benjamin Leder , an endocrine dr from Mass General Hospital , the title was" Combined and Sequential Approaches to Osteoporosis Therapy." It was very interesting and informative. Studies of what meds they've used together , and different sequences of them. Plus he discussed where they are at in the development of new drugs, which was a bit dismaying , as he stated there isn't a lot going on to look at researching new med options. I feel sad about that . Makes me think they feel like what's out there is working and the best they can come up with , which I think many on this forum clearly would disagree with!!!! Hope you can find this information if you're so inclined!