I chose Tymlos because it is one of the two drugs that actually build bones. I chose it over Forteo because it is newer and I hope a bit better; It is taken for 18 months vs. 2 years on Tymlos and it is less expensive that Tymlos. My first 90 day supply cost $1780 -- with my insurance. The 2nd 90 day supply cost $680 -- I don't know why my cost changed, but I am grateful.