Lipitor is a medication used to lower cholesterol levels in the body. According to the sources provided, some of the common side effects of Lipitor (atorvastatin) include headache, muscle pain, diarrhea, and nausea [2][3]. In addition, Lipitor can cause liver damage in rare cases, which may result in yellowing of the skin or eyes, abdominal pain, or dark urine [2][3]. Patients taking Lipitor may also experience allergic reactions, such as difficulty breathing, hives, or swelling of the face, lips, tongue, or throat [3]. It is important to note that some patients may experience serious side effects, including muscle breakdown and kidney damage, although these side effects are rare [2]. If you experience any of these symptoms, you should seek medical attention immediately.

In conclusion, Lipitor is a medication that is generally well-tolerated by most patients. However, like all medications, it can cause side effects. The most common side effects of Lipitor include headache, muscle pain, diarrhea, and nausea. In rare cases, Lipitor can cause liver damage, allergic reactions, muscle breakdown, and kidney damage. If you experience any symptoms while taking Lipitor, you should consult your healthcare provider immediately.

Sources:
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013
[3] https://medlineplus.gov/druginfo/meds/a600045.html