My sister who is 84 takes Fosamax (once a week) to maintain bone structure. I think she takes it properly -- with the 6-8 ounces of water, first thing in the morning, etc. However, within a few minutes, she has a bad diarrhea problem -- once over, she is mainly okay. Is there anything she can do to prevent the diarrhea attack? Or, to maybe, slow it down? Suzanne