I tried taking Lipitor on two occations for several weeks each. About a week into each attempt at using Lipitor I began having sustantial pain in my left shoulder. This was severe enough I also began taking nsaids for arthritus with limited relief. After discontinuing Lipitor for about 3 weeks my shoulder pain slowly dimminished. The following month I made another attempt to take Lipitor for several weeks with the same results. Currently I am not taking Lipitor or Artritis medicine and am pain free.