I took Boniva four days ago and within one day I had a backache that is so bad, that I have difficulty walking, breathing, or staying in any position very long. Since I haven't done anything different since taking the pill, both my doctor and I believe it is a side effect from Boniva. I am so sorry I took this. I have rheumatoid arthritis and about 6 months ago I started with a new rheumatologist who gave me medication that removed all the pain. I was beginning to believe I would just have to endure daily pain but plaquenal and mobic did the trick. However, now I am in extreme pain and this is the third day. The pain eases at times but is still extreme. I'm just hoping it will go away.