I saw the breast cancer question posted by a member here mention she was taking Bonista, the medication for Osteoporosis
. As far as I have researched, the only serious risk known for the teriparatide is bone cancer, not breast cancer. Hope this helps!
As for myself, I am a patient suffering from severe osteoporosis. My doctor, realizing I cannot afford Forteo ($950 per month!), has suggested I try to find how I can take the equivalent, generic version, which is Bonista.