Lipitor is a brand name for the drug atorvastatin, which belongs to a class of drugs called statins that are used to lower cholesterol levels in the blood [1]. Statins work by blocking an enzyme that the liver needs to produce cholesterol, thereby reducing the amount of cholesterol that the liver produces and increasing the liver's ability to remove cholesterol that is already in the blood [2]. According to a Harvard Health Publishing article, statins are generally effective at lowering cholesterol levels, but they may not work for everyone, and some people may experience side effects such as muscle pain or weakness [2].

Citrus fruits, on the other hand, contain compounds called flavonoids that have been shown to have potential cholesterol-lowering effects [3]. A study published in the journal Nutrients found that consuming citrus flavonoids was associated with lower levels of LDL cholesterol (the "bad" cholesterol) and triglycerides, as well as higher levels of HDL cholesterol (the "good" cholesterol) [3]. However, the study authors note that more research is needed to confirm these findings and to determine the optimal dose and duration of citrus flavonoid consumption for cholesterol-lowering benefits [3].

In summary, while Lipitor (atorvastatin) is a proven medication for lowering cholesterol levels, it may not work for everyone and may cause side effects in some people. Citrus fruits contain compounds that have shown potential for cholesterol-lowering effects, but more research is needed to confirm these findings and determine the best way to incorporate citrus into a cholesterol-lowering diet [1][2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.health.harvard.edu/newsletter_article/help-for-your-cholesterol-when-the-statins-wont-do
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6497409/