From what I understand from my doctor ( Rheumatologist) who is highly respected, after Evenity you cannot go to some of the other drugs. I cannot use Thymos as I am prone to kidney stones and that drug produces them. He has had much success in the Evenity/Prolia combination and yes I know they make both drugs. But it is my understanding that you can lose the gains you have made by using some of the other drugs after Evenity. With some of the other drugs you have more choices but not with Evenity. So Ill assume if some do not want to use Prolia they shouldnt use Evenity prior. This is what I have read here and also elsewhere. I have severe osteoporosis. I have to do what I feel will help me the most. Im 67 and I need to make choices that will benefit me in the short term as I have already had a few compression fractures in my spine and I have had a few broken ribs. So I understand that everyone has a different opinion but I have to trust my doctor who has seen much success over the last few years. Additionally I have a liver disease ( PBC) and drugs are a huge enemy in terms of what I can use and what I cannot.