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Based on the available information, there is no specific schedule for liver checks for Lipitor (atorvastatin) users that is universally recommended. Lipitor is a statin medication used to lower cholesterol levels, and while it is generally well-tolerated, it can cause liver enzyme abnormalities in rare cases [1].

Healthcare providers typically monitor liver function in patients starting a statin medication, but the frequency and duration of these checks may vary depending on individual patient factors, such as medical history, other medications, and the presence of liver disease [1]. The U.S. Food and Drug Administration (FDA) recommends liver enzyme tests before starting a statin, and as clinically needed thereafter [2].

It is essential for patients to follow their healthcare provider's instructions regarding liver function monitoring while taking Lipitor or any other medication. If you have concerns about liver checks or any other aspect of Lipitor use, consult your healthcare provider for personalized advice [1].

In summary, there is no specific schedule for liver checks for Lipitor users, and monitoring frequency depends on individual patient factors. Healthcare providers typically monitor liver function in patients starting a statin medication, and patients should follow their healthcare provider's instructions.

Sources:
[1] Lipitor (atorvastatin) [Prescribing Information]. Pfizer Labs. 2017. <https://www.accessdata.fda.gov/drugsatfda_docs/label/2017/021358s043lbl.pdf>.
[2] High Cholesterol Medications (Statins). U.S. Food and Drug Administration. <https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/high-cholesterol-medications-statins>.
[3] Atorvastatin. DrugPatentWatch. <https://www.drugpatentwatch.com/drugs/atorvastatin>.