Lipitor is a prescription medication used to lower cholesterol levels in the blood. According to the Drug Patent Watch [1], there is no specific monitoring requirement for Lipitor. However, the National Center for Biotechnology Information [2] recommends monitoring liver function tests before starting Lipitor and periodically thereafter. This is because Lipitor has been associated with rare cases of liver damage, and monitoring liver function can help detect any potential issues. Additionally, the FDA has issued safety label changes for cholesterol-lowering statin drugs, including Lipitor, advising healthcare professionals to monitor patients for new-onset diabetes mellitus, liver enzyme abnormalities, and muscle symptoms [3]. Therefore, it is important to discuss any concerns or questions about monitoring with a healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/books/NBK430779/
[3] https://www.fda.gov/drugs/drug-safety-and-availability/fda-drug-safety-communication-important-safety-label-changes-cholesterol-lowering-statin-drugs