Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. While it is generally well-tolerated, some patients have reported side effects and complaints. According to the reviews on WebMD [2] and Drugs.com [3], some of the most commonly reported side effects include muscle pain, weakness, and tenderness, which can be indicative of a rare but serious condition called rhabdomyolysis. Other reported side effects include headache, nausea, diarrhea, and constipation. Some patients have also reported cognitive issues, such as memory loss and confusion. It is important to note that these side effects are relatively rare and that most patients taking Lipitor do not experience them. Patients who experience any concerning symptoms while taking Lipitor should consult with their healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://reviews.webmd.com/drugs/drugreview-3330-lipitor-oral
[3] https://www.drugs.com/comments/atorvastatin/lipitor.html