Lipitor is a prescription medication that contains atorvastatin, which is used to treat high cholesterol levels and reduce the risk of heart disease [1]. As with any medication, Lipitor can cause side effects. According to the Mayo Clinic, common side effects of statins, including Lipitor, include muscle pain, nausea, diarrhea, and constipation [3]. Additionally, Lipitor may cause liver damage in rare cases, which can result in symptoms such as yellowing of the skin and eyes, dark urine, and abdominal pain [3]. Drugwatch also notes that Lipitor may increase the risk of developing type 2 diabetes, especially in women and people who are already at risk for the disease [2]. It is important to talk to your doctor about any potential side effects before starting Lipitor or any other medication.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.drugwatch.com/lipitor/side-effects/
[3] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013