OK ladies......I've argued the hair-loss "thing" w/my Rhumo & 2 diff. MD's & they all say, NO, hair loss will NOT happen w/Fosomax OR Actonel. Eventho, I've really had some problems losing my hair. They say it's due to post-menapause!!!!UGH. I called Merck & Procter & they both said, it is not a known side effect of either drug. Well....guess what....maybe...not enough studies have been done re:hair loss. With all of the women reporting this as a side effect, I'd surely investigate, PROCTER & MERCK!!!!!!!!!. It makes me very angry to think the stuff they are shoving down our throats could be doing these horrible things to us!!!!. What about the cleaning agent Bitsy? Can you provide what chemical it is & where it is found (i.e.) what product, Lysol, Mr. Clean, 409, etc???? If I find this to be true, I will never take another Actonel. I took one 2 weeks ago, after being off for 2 months, & now have been on an IBS kick, so I have not taken the next one. Well, the weight gain goes on, but that could be due to the stomach problems I have, which could be due to inflammation from bisphosphonates? Who knows. Anymore input appreciated. GOD BLESS AMERICA