Lipitor is a brand name for the medication atorvastatin, which is used to lower cholesterol levels and reduce the risk of heart disease. While Lipitor can be an effective medication, it can also cause side effects in some patients.

According to the National Health Service (NHS) [2], some of the most common side effects of atorvastatin include headaches, feeling sick, diarrhea, constipation, and stomach pain. Additionally, some patients may experience muscle pain, weakness, or tenderness, which can be a sign of a more serious condition called rhabdomyolysis. Other potential side effects of atorvastatin include memory loss, confusion, and an increased risk of developing type 2 diabetes.

Drugwatch [3] notes that some patients may also experience liver problems while taking Lipitor, including liver damage or inflammation. This is more likely to occur in patients who already have liver disease or who consume large amounts of alcohol.

It's important to note that not all patients will experience side effects while taking Lipitor, and many people are able to take the medication without any problems. However, if you do experience any side effects while taking Lipitor, it's important to speak with your doctor as soon as possible. Your doctor may be able to adjust your dosage or switch you to a different medication to help manage your symptoms.

Sources:
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.drugwatch.com/lipitor/side-effects/