It will depend on your Part D plan. There are many to choose from. They differ in their formularies (the drugs they cover.). So you would want to choose a plan that covers Tymlos (or its generic). It's hard to find out what you would pay until your doctor actually orders the prescription. You can always refuse it if it turns out to be more than you can afford. You can always try to get an answer from your insurance co. or the pharmacy that you would use before the prescription is ordered which in my view is how it SHOULD work but it may not represent the actual cost. From what I have seen and read, the patient assistance program that drug companies offers only applies to commercial insurance, not Medicare or Medicare Advantage. I have a Medicare Advantage plan so do not need (and couldn't buy if I wanted to) a separate Plan D as MA includes drug coverage. But MAs also have their own formularies so you would still need to check if your MA plan, should you go that route, covers Tymlos. Personally, I am just starting teriparatide, the generic of Forteo, which is similar to Tymlos. It is the only anabolic my MA drug plan covers. (Evenity, the other anabolic, is covered under Medicare Part B.) My cost is $100 for a 3-month supply, so that's only $33 a month.