What is the price of the obesity injection?

Hello. I am on the thin side, but my mother has gained a lot of weight recently. She is a woman in her late 50s. Since she is a full-time housewife, she doesn't exercise regularly, so it is not easy for her to lose weight. I am asking because I was wondering if getting weight loss injections might be helpful.

First, I would like to know if it is safe for a woman in her late 50s to receive weight-loss injections. If so, I would like to know the approximate cost. Also, how many months' supply should I usually purchase initially? I have heard that some cases do not work, so I would like to start with a small amount. I would like to give my mother the gift of health at a good price.