... on 80 mg of lipitor daily. I found that shortly after my complete back muscles would ache and pain severely. after some months I complained to my Doctor and my Lipitor was cut to 40 mg daily. I have stayed on that level until this past week when I complained to my Doctor that I could no longer stand the back muscle pain and went off of Lipitor completely. I have only been off of it for 1 week and have come down with diarrhea. The back pain has not yet stopped, but my Dr. has told me to be off of Lipitor for 3 to 4 weeks to see if there is any difference. I do not know if the diarrhea was caused by going off of Lipitor completely or not. I will suffer through this and see if the pain subsides in another 2 to 3 weeks. I will keep in touch with this site and let you all know what happens. Meanwhile I would like to hear from any others going through the same type of issue.