Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to the sources provided, it can take several weeks or months to see results with Lipitor.

WebMD [1] explains that cholesterol-lowering medications like Lipitor are not a quick fix, and it can take several weeks or even months to see results. The article notes that patients may start to see a reduction in their cholesterol levels after about four weeks of taking the medication, but it may take up to three months to see the full effect.

The NHS [2] provides similar information, stating that it can take up to four weeks to see an improvement in cholesterol levels with atorvastatin. The article notes that the full effect of the medication may not be seen for up to three months.

DrugPatentWatch [3] provides additional information about the timeline for Lipitor. The website notes that the patent for Lipitor expired in 2011, which means that generic versions of atorvastatin are now available. According to the website, the average time to onset of action for atorvastatin is one to two weeks, and the maximum effect is typically seen after four weeks of treatment.

In summary, it can take several weeks or even months to see results with Lipitor. Patients may start to see a reduction in their cholesterol levels after about four weeks of taking the medication, but it may take up to three months to see the full effect. The average time to onset of action for atorvastatin is one to two weeks, and the maximum effect is typically seen after four weeks of treatment.

Sources:
[1] https://www.webmd.com/cholesterol-management/features/when-your-doctor-orders-cholesterol-lowering-medications
[2] https://www.nhs.uk/medicines/atorvastatin/common-questions-about-atorvastatin/
[3] https://www.drugpatentwatch.com/p/tradename/LIPITOR