Lipitor, also known as atorvastatin, is a medication that is commonly prescribed to lower cholesterol levels in the body. According to Drug Patent Watch [1], Lipitor works by blocking the production of cholesterol in the liver, which in turn reduces the amount of cholesterol in the bloodstream.

The American Heart Association [2] notes that the effects of Lipitor on cholesterol levels can be seen within a few weeks of starting treatment. However, the amount of time it takes for Lipitor to significantly reduce cholesterol levels can vary depending on the individual and the severity of their condition. In some cases, it may take several months for the full effects of the medication to be seen.

WebMD [3] also notes that lifestyle changes such as a healthy diet and exercise can help to speed up the process of reducing cholesterol levels when taking Lipitor. It is important to follow your doctor's instructions carefully when taking Lipitor, as well as to have regular check-ups to monitor your cholesterol levels and overall health.

In conclusion, Lipitor can start to reduce cholesterol levels within a few weeks of starting treatment, but the full effects may take several months to be seen. It is important to follow a healthy lifestyle in conjunction with taking Lipitor, and to have regular check-ups with your doctor to monitor your cholesterol levels and overall health.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ahajournals.org/doi/full/10.1161/01.atv.15.5.678
[3] https://www.webmd.com/cholesterol-management/features/when-your-doctor-orders-cholesterol-lowering-medications