Lipitor is a brand name for atorvastatin, which is a medication used to lower cholesterol levels in the blood [3]. According to the provided sources, there is no clear evidence of how Lipitor affects breast milk production.

The first source provides information about Lipitor's patent and its expiration date. It does not provide any information on how Lipitor affects breast milk production [1].

The second source is a book chapter that discusses the use of medications during breastfeeding. It states that atorvastatin is not recommended for use during breastfeeding because there is limited information on its effects on breast milk and the infant [2].

The third source, MedlinePlus, provides patient information on Lipitor. It states that it is not known whether atorvastatin passes into breast milk or if it could harm a nursing baby [3].

In conclusion, there is limited information available on how Lipitor affects breast milk production. It is not recommended for use during breastfeeding due to the lack of information on its effects on breast milk and the infant. It is important for breastfeeding mothers to consult with their healthcare provider before taking any medications.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/books/NBK501361/
[3] https://medlineplus.gov/druginfo/meds/a600045.html