Lipitor is a brand name for the drug atorvastatin, which is a type of medication used to lower cholesterol levels in the body. According to the sources provided, there are several potential side effects associated with taking Lipitor/atorvastatin.

The first source, Drug Patent Watch [1], does not provide information on side effects, but rather provides information on the patent status of the drug.

The second source, NHS [2], states that some common side effects of atorvastatin include headaches, nausea, diarrhea, constipation, and stomach pain. In addition, some people may experience muscle pain or weakness, which can be a sign of a rare but serious condition called rhabdomyolysis. Other rare but serious side effects include liver problems and an increased risk of diabetes.

The third source, Mayo Clinic [3], provides similar information on side effects, stating that common side effects of atorvastatin include headache, joint pain, diarrhea, and nausea. It also notes that muscle pain or weakness can be a sign of rhabdomyolysis, and that liver problems and an increased risk of diabetes are rare but serious side effects.

Overall, while Lipitor/atorvastatin can be an effective medication for lowering cholesterol levels, it is important to be aware of the potential side effects. If you experience any of the side effects listed above or have concerns about taking this medication, it is recommended that you speak with your healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/side-effects-of-atorvastatin/
[3] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20067003