Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the body. According to the sources provided, the time it takes for Lipitor to work with dietary changes can vary.

The first source [1] provides information on the patent for Lipitor, but does not give any specific information on how long it takes for the medication to work with dietary changes.

The second source [2] explains that Lipitor is typically taken once a day and can take up to two weeks to start working. However, it is important to note that dietary changes alone may not be enough to lower cholesterol levels and medication may be necessary.

The third source [3] states that statins, including Lipitor, can start to lower cholesterol levels within two weeks of starting the medication. However, the full effects of the medication may not be seen for up to four to six weeks.

It is important to note that the effectiveness of Lipitor and dietary changes may vary depending on individual factors such as age, weight, and overall health. It is recommended to consult with a healthcare provider to determine the best course of treatment for high cholesterol.

In conclusion, Lipitor can take up to two weeks to start working and up to four to six weeks to see the full effects when combined with dietary changes. However, individual results may vary and it is important to consult with a healthcare provider for personalized treatment options.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.healthline.com/health/drugs/atorvastatin-oral-tablet
[3] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statins/art-20045772