Lipitor (atorvastatin) is a medication used to lower cholesterol levels and reduce the risk of heart disease and stroke. However, like all medications, it can cause side effects. The most common side effects of Lipitor include muscle and joint pain, diarrhea, constipation, nausea, and headache [2]. In rare cases, Lipitor can cause more serious side effects, such as liver problems, muscle damage, and an increased risk of diabetes [1].

Liver problems are rare but can occur in people taking Lipitor. Symptoms of liver problems include yellowing of the skin or eyes, dark urine, and upper abdominal pain. If you experience any of these symptoms, you should contact your doctor immediately [2].

Muscle damage is another rare but serious side effect of Lipitor. Symptoms of muscle damage include muscle pain, weakness, and tenderness. In severe cases, muscle damage can lead to a condition called rhabdomyolysis, which can cause kidney damage and even death. If you experience any muscle pain or weakness while taking Lipitor, you should contact your doctor immediately [3].

Finally, some studies have suggested that Lipitor may increase the risk of developing diabetes, particularly in people who already have risk factors for the disease. If you have a family history of diabetes or are overweight, you should talk to your doctor about the risks and benefits of taking Lipitor [1].

In summary, while Lipitor is generally considered safe and effective, it can cause side effects, including muscle and joint pain, diarrhea, constipation, nausea, headache, liver problems, muscle damage, and an increased risk of diabetes. If you experience any of these symptoms while taking Lipitor, you should contact your doctor 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/