ipg,
I see luck in being trapped between the two very best osteoporosis medications.
Rats given the equivalent of the 20mcg dose in Forteo were treated for 70% of their lifetime without developing bone tumors. https://journals.sagepub.com/doi/pdf/10.1080/01926230490462138
Evista slows down bone resorption. It is said to be equal to alendronate, except that it doesn't seem to protect the hips.
There is a lot of hope for new medications, and it is reasonable to think about buying time. as long as you don't risk fracture meanwhile. It's good that you are examining and questioning everything.
Forteo gives your bloodstream an intense jolt of part of the parathyroid hormone. The half life is about 1 hour but it is gone from your bloodstream within about 4 hours. So these poor rats were inbred to lead to an identical line of rats and they upset trials for 50 years (not just in osteoporosis trials, because they lack the genetic diversity to prevent spontaneous tumors. The tumors didn't happen in response to exposure to teriparatide.
I think bisphosphonates are the only osteoporosis drugs that give you a holiday. With Evenity, Forteo, Tymlos you lose the increase in BMD usually in close to a year. With Prolia you lose more than the increase and most people fracture within the first year.
The trouble with Forteo and Tymlos is that they can stop being effective at around 18 month.
If anything make you wonder, I hope you ask. I'm enjoying our exchange.