The last thing you want is Alendronic Acid. They put my Mum on that and then left her on it for 15 years! There is supposed to be a 5 year limit. It's nasty stuff. It stops old bone from being lost, but also stops new bone forming so you end up with chalk for bones! She now has stress fractures in the bones of her feet, just from standing up and moving around. At 83 she's a sparrow in weight, it's so unfair. She loved to walk to the shops and back. That stuff is poison.
She is now on the injection treatment that she has every 6 months.