I was taking Lipitor (can't remember how long and what mg) and started feeling like I was continously in a fog and having memory problems. These were so bad that my GP sent me to a Neurologist for MRI and CT scans with results showing nothing wrong. I decided that this started after I went on the Lipitor and took myself off of it. The "fog has lifted" but I still have some memory problems. I am now taking Zetia and have started having muscle pains and cramps. I'm going to give up on cholesterol lowering medications. If I can't lower it with diet and exercise I'll just take my chances with the high cholesterol!