I am in the same boat. I don't think I understood the second drug requirement right away. I was diagnosed with severe OP 2 years ago. I tried to do all non-drug things the first year on my own, and had some progress. Now I'm on Tymlos, 11 months in, with excellent results. I'm told that after 2 years on it, I can't continue, and that I will have to go on a bone saver drug (Tymlos is a builder drug). My mom was on Fosamax, and her jaw was like Swiss cheese. I told my PC that I don't want to take that category of drugs after Tymlos. We are both kinda kicking that can down the road- not worth arguing about it yet. I have a dream that I can get back to normal bone density in the next 13 months, then convince her to allow me to keep up everything (non-drug) that I'm doing now, and Dexa after 6 months to see if I can avoid the next drug. I'm working very hard now to reach that goal, so we'll see. I do expect to do lifetime maintenance as far as diet and exercise. I have gone from severe OP to osteopenia, and worked really hard, so if that first Dexa 6 months after stopping Tymlos shows a loss, I'm sure I will reevaluate follow up drugs. This is a lifetime journey, but it is so much better than many other journeys that people have to take...