I was on Prolia for two years prior to starting Evenity. I had wonderful gains on Prolia. I went from a -4.1 to a -3.6! However, most of my gains happened the 1st year. My doctor put me on Evenity for a year. I continued to gain to a -3.3. I am back on Prolia. My endocrinologist told me that in the future, I may be back on Evenity for another year. I have not had a bone scan since restarting Prolia.