Confused re Zometa-Purpose

@Abbydog I have completed 6 infusions of Zometa over 3 years to improve my bone density. I lost 5% when I started taking Letrozole 6 years ago. I was just above the threshold from being osteoporotic.  My bone density has now improved so I will stay on Letrozole for another 4 years. My oncologist has suggested a maintenance dose of Zometa maybe once a year. 

@Abbydog I am having Zometa every three months. For the past year I had it six weekly. My Onco says it is to strengthen my bones so that the cancer has a harder time attacking. I have Mets in my bones and lymph nodes.

From UK Cancer Research site;

Zoledronic acid is a type of drug known as a bisphosphonate . It is also called Zometa.

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 the chance of breast cancer coming back after surgery in certain situations
• prevent bone loss for people having aromatase inhibitors 
• lower high levels of calcium in the blood (hypercalcaemia ), which can happen in secondary bone cancer