A couple of years ago I had two Reclast infusions. I would go upstairs in our building have my infusion and go back to work in the Chem lab. Never had a side effect but had to stop due to a dental implant. Before that, I was on Fosamax for several years and had no side effects. Now the docs have me trying Tymlos. We will see how that turns out. Hope this helps a little bit and my thoughts are with you with your back surgery coming up.