Lipitor is a medication used to lower cholesterol levels in the blood. While it is generally well-tolerated, there are some rare side effects that have been reported.

According to Drug Patent Watch [1], some rare side effects of Lipitor (atorvastatin) include:

- Muscle breakdown (rhabdomyolysis): This can cause muscle pain, weakness, and dark urine.
- Liver problems: In rare cases, Lipitor can cause liver damage, which can lead to jaundice (yellowing of the skin and eyes) and liver failure.
- Allergic reactions: Some people may experience an allergic reaction to Lipitor, which can cause hives, difficulty breathing, and swelling of the face, lips, tongue, or throat.
- Neurological effects: Rarely, Lipitor can cause memory loss, confusion, and other neurological symptoms.

WebMD [2] lists additional rare side effects of Lipitor, including:

- Pancreatitis: Inflammation of the pancreas, which can cause severe abdominal pain, nausea, and vomiting.
- Blood disorders: Lipitor can cause a decrease in the number of blood cells, which can lead to anemia, bleeding, and infections.
- Skin reactions: Rarely, Lipitor can cause a severe skin reaction called Stevens-Johnson syndrome, which can cause blisters, peeling skin, and a fever.

The Mayo Clinic [3] also notes that rare side effects of Lipitor can include:

- Diabetes: In rare cases, Lipitor can increase blood sugar levels and lead to the development of diabetes.
- Sexual dysfunction: Some people may experience sexual side effects while taking Lipitor, such as erectile dysfunction or a decrease in libido.

It is important to note that while these side effects are rare, they can be serious. If you experience any unusual symptoms while taking Lipitor, you should contact your healthcare provider immediately.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.webmd.com/drugs/2/drug-3330/lipitor-oral/details/list-sideeffects
[3] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20067003