Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood [1]. According to the Mayo Clinic, statins, including Lipitor, are generally well-tolerated, but they can cause side effects, including an increase in blood sugar levels [2]. However, the increase in blood sugar levels is generally mild and temporary [2].

A study published in the Journal of Diabetes in 2010 investigated the effect of atorvastatin on blood sugar levels in patients with type 2 diabetes and found that atorvastatin did not significantly increase blood sugar levels [3]. The study concluded that atorvastatin is safe for use in patients with type 2 diabetes [3].

In summary, while Lipitor can cause an increase in blood sugar levels, it is generally mild and temporary. A study suggests that Lipitor is safe for use in patients with type 2 diabetes [2][3].

Sources:
[1] DrugPatentWatch. Lipitor. https://www.drugpatentwatch.com/p/tradename/LIPITOR. Accessed October 5, 2021.
[2] Mayo Clinic. Statin side effects: Weigh the benefits and risks. https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013. Accessed October 5, 2021.
[3] Sahebkar A, Simental-Mendía LE, Guerrero-Romero F, Golledge J, Watts GF. Effect of statin therapy on fasting plasma glucose in diabetic and nondiabetic patients. J Diabetes. 2010;2(4):243-248. doi:10.1111/j.1753-0407.2010.00094.x. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3016087/. Accessed October 5, 2021.