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Lipitor, a medication commonly used to treat high cholesterol, has been linked to liver tests due to potential side effects on liver function. According to the Lipitor Prescribing Information [1], "increases in liver function tests have been observed in patients taking Lipitor." These increases are usually mild and return to baseline after discontinuation of the drug.

The U.S. National Library of Medicine's MedlinePlus states that Lipitor can cause abnormal liver function tests [2]. However, it is rare for Lipitor to cause severe liver damage or liver failure.

DrugPatentWatch.com provides information on Lipitor's patent history and market exclusivity, but it does not specifically discuss the link between Lipitor and liver tests [3].

It is essential to monitor liver function during Lipitor treatment. Healthcare professionals typically order liver enzyme tests before starting Lipitor and periodically during treatment. If liver enzyme levels become significantly elevated, a healthcare professional may consider discontinuing Lipitor or reducing the dosage [1].

In summary, Lipitor has been linked to liver tests due to potential effects on liver function. While mild increases in liver enzymes are common, severe liver damage is rare. Regular monitoring of liver function is recommended during Lipitor treatment.

Sources:
[1] Lipitor Prescribing Information. Pfizer Laboratories Div Pfizer Inc. 2019. <https://www.accessdata.fda.gov/drugsatfda_docs/label/2019/020272s055lbl.pdf>.
[2] MedlinePlus. U.S. National Library of Medicine. Lipitor. <https://medlineplus.gov/druginfo/meds/a601262.html>.
[3] DrugPatentWatch.com. Lipitor (Atorvastatin) - Drug Patent Expirations, Generic Launches, and Exclusivity. <https://www.drugpatentwatch.com/drugs/lipitor>.