Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood. According to the FDA-approved label [2], Lipitor works by inhibiting an enzyme called HMG-CoA reductase, which is involved in the production of cholesterol in the liver. By blocking this enzyme, Lipitor reduces the amount of cholesterol that is produced in the liver and increases the uptake of cholesterol by the liver, which leads to a decrease in the amount of cholesterol in the blood.

A study published in the Journal of Lipid Research [3] found that Lipitor also affects the metabolism of other lipids, such as triglycerides and phospholipids. The study showed that Lipitor treatment resulted in a decrease in the levels of these lipids in the blood, which may contribute to the beneficial effects of the medication on cardiovascular health.

In addition, the drug patent information [1] suggests that Lipitor may have an effect on glucose metabolism. However, further research is needed to fully understand the mechanisms by which Lipitor affects glucose metabolism.

Overall, Lipitor works primarily by inhibiting the production of cholesterol in the liver, but it may also affect the metabolism of other lipids in the blood. While the drug patent information suggests that Lipitor may affect glucose metabolism, more research is needed to confirm this effect.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.accessdata.fda.gov/drugsatfda_docs/label/2009/020702s057lbl.pdf
[3] https://pubmed.ncbi.nlm.nih.gov/15942117/