Lipitor is a medication used to lower cholesterol levels and reduce the risk of heart disease. While it is known to have potential side effects on liver function, it can also improve liver function in some cases. However, the timeline for improvement can vary depending on the individual.

According to the Drug Patent Watch [1], Lipitor's active ingredient, atorvastatin, has been shown to improve liver function in patients with non-alcoholic fatty liver disease (NAFLD) and non-alcoholic steatohepatitis (NASH). In a study published in the Journal of Hepatology [2], patients with NAFLD who took atorvastatin for 12 months showed significant improvements in liver function tests. However, the study did not specify how quickly these improvements occurred.

In terms of side effects, Lipitor can cause liver damage in some patients. Medical News Today [3] reports that liver damage is a rare but serious side effect of Lipitor. Symptoms of liver damage may include yellowing of the skin or eyes, dark urine, and abdominal pain. If these symptoms occur, patients should seek medical attention immediately.

In conclusion, Lipitor has been shown to improve liver function in some patients with NAFLD and NASH, but the timeline for improvement is not specified in the available sources. However, it is important to note that Lipitor can also cause liver damage in some patients, and symptoms should be monitored closely. Patients should always consult with their healthcare provider regarding the benefits and risks of taking Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3070374/
[3] https://www.medicalnewstoday.com/articles/drugs-lipitor-side-effects