Lipitor, the brand name for the drug atorvastatin, is a medication used to lower cholesterol levels and reduce the risk of heart disease [1]. As with any medication, Lipitor may cause side effects. According to the National Health Service (NHS), the most common side effects of atorvastatin include headache, nausea, diarrhea, constipation, and muscle and joint pain [2]. In addition, the Mayo Clinic notes that atorvastatin may cause liver problems, which can lead to yellowing of the skin or eyes, dark urine, and abdominal pain [3]. Rare but serious side effects of atorvastatin include muscle damage, which can cause muscle pain, weakness, and kidney damage [2][3]. It is important to note that not everyone who takes Lipitor will experience side effects, and the severity of side effects can vary from person to person. If you experience any side effects while taking Lipitor, it is important to speak with your healthcare provider. They may be able to adjust your dosage or switch you to a different medication to help manage your symptoms.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20067003