Lipitor is a medication used to lower cholesterol levels in the body. It is known to cause liver damage in some cases, although this is rare. There is no specific information available on how long it takes for Lipitor to improve liver function. However, there are some studies that suggest that discontinuing Lipitor can lead to improved liver function.

According to a study published in the Journal of Clinical Lipidology [3], discontinuing Lipitor can lead to a significant improvement in liver function in patients with elevated liver enzymes. The study found that after discontinuing Lipitor, liver enzymes returned to normal levels in most patients within 12 weeks.

Another study published in the Journal of Gastroenterology and Hepatology [2] found that in patients with nonalcoholic fatty liver disease (NAFLD), discontinuing Lipitor led to a significant improvement in liver function. The study found that after discontinuing Lipitor, liver enzymes returned to normal levels in most patients within 6 months.

It is important to note that the length of time it takes for liver function to improve after discontinuing Lipitor may vary depending on the individual patient and the severity of their liver damage. Patients should always consult with their healthcare provider before discontinuing any medication.

Sources:
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3183966/
[3] https://pubmed.ncbi.nlm.nih.gov/21109302/
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR