I think I had pamidronate, if I remember correctly (or was it alendronate?) - I can't remember. In IV form, 5 consecutive days - hospital stay, many many many years ago. It didn't do a thing for my CRPS as a whole. My legs were too far gone.

Normally you get this treatment once a week, but I was in such bad shape that they made it into 5 consecutive days of treatment. And they let it drip for 4H otherwise the side-effects would be too bad.

It was used in Belgium fairly often at the time (now I'm not so sure), and I had to consult a rheumatologist for it. I doubt pain specialists do this protocol.