After reviewing the available information, I found that Lipitor, a medication commonly prescribed to lower cholesterol levels, primarily works by inhibiting a different process. Contrary to the assumption in the question, Lipitor does not inhibit fat absorption. Instead, it inhibits the production of cholesterol in the body.

Lipitor is a type of drug called a statin, which works by blocking a specific enzyme called HMG-CoA reductase [1]. This enzyme plays a crucial role in the production of cholesterol within the body. By inhibiting this enzyme, Lipitor reduces the amount of cholesterol that the liver produces, which in turn helps to lower the overall cholesterol levels in the body.

This mechanism of action allows Lipitor to be effective in reducing the risk of heart attacks and strokes in patients with high cholesterol levels or those with other risk factors for heart disease [2].

In summary, Lipitor primarily works by inhibiting the production of cholesterol in the body, rather than by inhibiting fat absorption.

Sources:
[1] "Lipitor (atorvastatin) dosing, indications, interactions, adverse effects, and more." RxList, <https://www.rxlist.com/lipitor-drug.htm>.
[2] "Atorvastatin." DrugPatentWatch, <https://www.drugpatentwatch.com/drugs/atorvastatin>.