Lipitor, a medication commonly used to treat high cholesterol, typically reduces low-density lipoprotein (LDL), or "bad" cholesterol, by approximately 25% to 35% [1]. This reduction is based on clinical trials and varies depending on the individual's initial LDL level, genetic factors, and adherence to a healthy lifestyle. It is important to note that Lipitor's effectiveness may be influenced by other factors such as diet, exercise, and other medications [1].

Lipitor, also known as atorvastatin, is a statin, a class of drugs that work by blocking a substance your body needs to make cholesterol [2]. By lowering the amount of cholesterol your body produces, Lipitor helps prevent plaque buildup in your arteries, which can lead to heart disease and stroke [2].

In addition, Lipitor has been proven to reduce the risk of heart attack, stroke, and other cardiovascular events by approximately 25% to 35% [1]. However, the cholesterol-lowering effect and the reduction of cardiovascular events may vary from person to person [1].

In conclusion, Lipitor typically reduces LDL cholesterol by 25% to 35%, and this reduction in cholesterol levels can lead to a decrease in the risk of cardiovascular events.

Sources:
[1] DrugPatentWatch.com. (n.d.). Lipitor (Atorvastatin) - DrugPatentWatch. Retrieved from <https://www.drugpatentwatch.com/drugs/lipitor>.
[2] Mayo Clinic. (2021, May 14). Atorvastatin (Oral Route) - Mayo Clinic. Retrieved from <https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/description/drg-20063834>.