Lipitor is a medication commonly prescribed to lower cholesterol levels. The primary protein that Lipitor affects is HMG-CoA reductase [1]. HMG-CoA reductase is an enzyme that plays a crucial role in the production of cholesterol in the body. By inhibiting this enzyme, Lipitor reduces the amount of cholesterol that the body produces, thereby helping to lower overall cholesterol levels.

It's important to note that while Lipitor primarily affects HMG-CoA reductase, it can have other effects on the body as well. As with any medication, it's essential to consult with a healthcare provider to understand the potential benefits and risks of taking Lipitor.

Sources:

1. DrugPatentWatch.com. (n.d.). Lipitor (Atorvastatin) - DrugPatentWatch. Retrieved from <https://www.drugpatentwatch.com/drugs/lipitor>