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Based on the information available, there is no evidence to suggest that Lipitor (atorvastatin) directly impacts liver function in a negative way. In fact, according to the manufacturer's prescribing information, Lipitor is generally well-tolerated and has not been associated with clinically significant changes in liver function tests [1]. However, it is important to note that all medications, including Lipitor, are metabolized in the liver. Therefore, liver function tests may be monitored during treatment to ensure proper drug metabolism [1].

It is also worth noting that, in rare cases, Lipitor has been associated with elevations in liver enzymes [1]. However, these elevations are typically mild and do not cause symptoms [1]. If symptoms such as jaundice, dark urine, or severe abdominal pain occur, it is important to seek medical attention immediately [1].

In summary, while Lipitor is not known to have negative side effects on liver function, it is still important to monitor liver function during treatment. If you have any concerns about taking Lipitor or its potential impact on liver function, it is important to speak with a healthcare provider.

Sources:
[1] Lipitor (atorvastatin) [prescribing information]. Pfizer Labs Div Pfizer Inc; 2016. Available from: <https://www.accessdata.fda.gov/drugsatfda_docs/label/2016/202052s051,202053s046,202054s049lbl.pdf>.