Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the body. Like any medication, it can cause side effects. According to the Mayo Clinic [2], common side effects of atorvastatin include headache, joint pain, diarrhea, and nausea. Other possible side effects include muscle pain or weakness, liver problems, and an increased risk of developing type 2 diabetes. However, the risk of developing these side effects is relatively low, and most people who take atorvastatin do not experience any adverse effects.

The NHS [3] notes that serious side effects of atorvastatin are rare but can include muscle pain, tenderness, or weakness, as well as yellowing of the skin or eyes, dark urine, and stomach pain. Anyone who experiences these symptoms should seek medical attention immediately. Additionally, atorvastatin can interact with other medications, so it is important to inform your doctor of any other medications you are taking.

Drug Patent Watch [1] also notes that atorvastatin has been associated with an increased risk of cognitive impairment, memory loss, and confusion in some patients, although this is a rare side effect. However, it is important to note that the benefits of taking atorvastatin in reducing the risk of heart disease and stroke generally outweigh the potential risks of side effects.

In conclusion, while atorvastatin can cause side effects, they are generally mild and uncommon. Serious side effects are rare, but anyone experiencing muscle pain, tenderness, or weakness, or yellowing of the skin or eyes should seek medical attention immediately. As with any medication, it is important to inform your doctor of any other medications you are taking to avoid potential interactions.

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