Lipitor is a medication that contains atorvastatin and is used to lower cholesterol levels in the blood. According to the sources provided, Lipitor can cause several side effects.

The first source [1] states that common side effects of Lipitor include diarrhea, joint pain, and urinary tract infection. It also mentions that less common side effects include memory loss, confusion, and muscle damage. Additionally, it notes that Lipitor can cause serious side effects such as liver damage and an increased risk of developing diabetes.

The second source [2] explains that Lipitor can cause side effects such as headache, nausea, and stomach pain. It also notes that muscle pain, weakness, and tenderness are possible side effects and that these symptoms can be signs of a rare but serious condition called rhabdomyolysis, which can cause kidney damage.

The third source [3] lists similar side effects, including muscle pain and weakness, as well as fatigue and dizziness. It also notes that Lipitor can cause liver damage, which can lead to yellowing of the skin and eyes, dark urine, and abdominal pain.

In summary, Lipitor can cause several side effects, ranging from common symptoms such as diarrhea and joint pain to more serious conditions such as liver damage and rhabdomyolysis. If you experience any of these symptoms while taking Lipitor, it is important to contact your healthcare provider immediately.

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