Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to the sources provided, there are some side effects associated with the use of Lipitor.

The first source [1] mentions several side effects that have been reported by patients taking Lipitor. These include muscle pain, weakness, and tenderness, as well as liver problems and an increased risk of diabetes. The source also notes that some people may experience allergic reactions to the drug, which can cause hives, difficulty breathing, and swelling of the face, lips, tongue, or throat.

The second source [2] provides a more comprehensive list of possible side effects of atorvastatin, which includes headache, nausea, diarrhea, constipation, and abdominal pain. Other reported side effects include dizziness, insomnia, and memory loss. The source notes that these side effects are generally mild and go away on their own, but some people may experience more serious side effects, such as muscle damage or liver problems.

The third source [3] provides a similar list of side effects, but also notes that atorvastatin can interact with other medications, including some antibiotics and antifungal drugs. This can increase the risk of side effects or make them more severe.

In summary, Lipitor (atorvastatin) can cause several side effects, including muscle pain, weakness, and tenderness, liver problems, an increased risk of diabetes, and allergic reactions. Other possible side effects include headache, nausea, diarrhea, constipation, and abdominal pain, as well as dizziness, insomnia, and memory loss. It is important to talk to your doctor about any concerns you may have about taking Lipitor, and to report any side effects you experience while taking the drug.

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/