After being on Lipitor for almost a year, I could barely walk from my car into my office. My legs were incredibly weak. It was like all the muscles had atrophied. I was 50 at the time, but felt like I was 80. About 1 1/2 years later, my legs are still weak, but better. (Then I was given the antibiotic Levaquin, and my knees almost stopped working after 4 days on that medication.) I would not recommend Lipitor and certainly not Levaquin, alone or in combination with each other, especially if you have experienced muscle pain or weakness with Lipitor!