Hi. I've not been on here for a while but am having my first flare up after being diagnosed with ulcerative colitis twelve months ago...which now turns out to be crohns!!
Anyhow, yes, I used to take alendronic acid, for about four years, after being diagnosed with osteoporosis, but stopped last year due to the overwhelming amount of pills I had to take, and the fact I'd never been entirely happy taking it anyway. It never caused me any problems, ever, I took it exactly as directed once a week.
I now take calcichew forte and am happy enough with that, can't see myself ever taking alendronic acid again, my GP hasn't even commented that I stopped it.