One has to consult with expert specialist in the matter. The goal is to select the best solution for the person considering their complete clinical picture. That is what the expert is supposed to do.
In my case I do not have breast cancer but lung cancer and was already on Prolia, so Endocrinologist had me continue.

Just googling I find "Zoledronic acid (Zometa) is a type of drug known as a bisphosphonate . You might have zoledronic acid to: prevent problems with the bones such as breaks in the bones (fractures) in myeloma and cancers that have spread to the bone (advanced cancers) lower high levels of calcium in the blood (hypercalcaemia) which can happen in secondary bone cancer"