Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. While most people tolerate it well, like any medication, it can cause side effects. According to the sources provided, some of the uncommon side effects of Lipitor include:

1. Liver problems: In rare cases, Lipitor can cause liver problems, including an increase in liver enzymes, liver damage, and liver failure. Patients taking Lipitor should have their liver function monitored regularly.

2. Muscle problems: Lipitor can cause muscle pain, weakness, or tenderness. In rare cases, it can also cause a serious condition called rhabdomyolysis, which can lead to kidney damage or failure.

3. Allergic reactions: Lipitor can cause allergic reactions in some people, including hives, difficulty breathing, and swelling of the face, lips, tongue, or throat.

4. Neurological problems: Lipitor can cause neurological problems, including memory loss, confusion, and forgetfulness.

5. Diabetes: Lipitor may increase the risk of developing diabetes, especially in people who already have risk factors for the disease.

It is important to note that not everyone who takes Lipitor will experience these side effects, and some people may experience side effects that are not listed here. Patients should talk to their doctor if they have any concerns about taking Lipitor or experience any side effects.

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.webmd.com/drugs/2/drug-3330/lipitor-oral/details/list-sideeffects