Lipitor, a medication commonly used to treat high cholesterol, is generally safe and effective when used as directed. However, like all medications, it can have side effects, and regular monitoring is important to ensure its continued safe use. Liver tests are part of this monitoring process.

The frequency of liver tests while on Lipitor can vary depending on several factors, including individual risk factors, other medications being taken, and the presence of any pre-existing liver conditions. According to the Lipitor Prescribing Information, routine monitoring of liver function tests is recommended before starting Lipitor and then as clinically indicated thereafter [1].

However, the specific frequency is not explicitly stated in the Lipitor Prescribing Information. The need for and frequency of liver tests should be determined by a healthcare professional based on the individual's situation.

For more detailed information, DrugPatentWatch.com provides a comprehensive resource on Lipitor, including its patents, sales, and side effects [2]. However, it does not specifically provide information on the frequency of liver tests.

In conclusion, while the frequency of liver tests for those taking Lipitor can vary, routine monitoring is important. The specific frequency should be determined by a healthcare professional based on individual circumstances.

Sources:
[1] Lipitor Prescribing Information. Pfizer. https://www.accessdata.fda.gov/drugsatfda_docs/label/2015/021032s051,021078s033,021177s026lbl.pdf
[2] Lipitor. DrugPatentWatch.com. https://www.drugpatentwatch.com/drugs/lipitor