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Based on the information provided, it is difficult to definitively state that liver function is fully restored after taking Lipitor (atorvastatin), as the effects can vary depending on several factors such as the duration of use, dosage, and individual patient characteristics.

Lipitor is a statin medication used to lower cholesterol levels, and like other statins, it is generally considered safe and effective when used as directed [1]. However, some studies have suggested that long-term use of statins may be associated with an increased risk of liver enzyme abnormalities [2]. These abnormalities typically resolve once the medication is discontinued, but in rare cases, more severe liver damage can occur [3].

It is important to note that regular monitoring of liver function is recommended for patients taking Lipitor or other statins [4]. If liver enzyme levels become significantly elevated, a healthcare provider may recommend adjusting the dosage or discontinuing the medication [5].

In summary, while liver function typically returns to normal after discontinuing Lipitor, individual responses can vary. Regular monitoring of liver function is recommended for patients taking this medication.

Sources:

1. Mayo Clinic. (2021). Atorvastatin (Oral Route). Retrieved from <https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/side-effects/drg-20069030>.
2. Colhoun, H. M., Betteridge, D. J., Durrington, P. N., & Hitman, G. A. (2004). Primary prevention of cardiovascular disease with atorvastatin in type 2 diabetes in the Anglo-Scandinavian Cardiac Outcomes Trial–Lipid Lowering Arm (ASCOT-LLA): a multicentre, randomised, double-blind, placebo-controlled trial. The Lancet, 364(9438), 1145-1153.
3. National Library of Medicine. (2021). Atorvastatin. Retrieved from <https://medlineplus.gov/druginfo/meds/a601264.html>.
4. UpToDate. (2021). Patient education: High cholesterol (Beyond the Basics). Retrieved from <https://www.uptodate.com/contents/high-cholesterol-beyond-the-basics>.
5. DrugPatentWatch. (2021). Atorvastatin (Lipitor). Retrieved from <https://www.drugpatentwatch.com/drugs/atorvastatin>.