After reviewing the available information, there is no definitive evidence that Lipitor, a medication used to treat high cholesterol, enters breast milk during pumping. However, it is generally recommended that women avoid taking Lipitor while breastfeeding due to the potential risks it may pose to the infant.

The manufacturer of Lipitor, Pfizer, states that it is not known whether Lipitor is excreted in human milk [1]. The absence of data on this specific medication means that it is difficult to make a definitive statement about whether it enters breast milk during pumping.

The lack of data on Lipitor specifically does not mean that it is safe to take while breastfeeding. The general guidance is that women should avoid taking medications while breastfeeding unless it is deemed necessary [2]. This is because medications can pass into breast milk and potentially harm the infant.

It is important to note that the decision to take Lipitor while breastfeeding should be made in consultation with a healthcare provider. Healthcare providers will consider the potential risks and benefits of the medication for both the mother and the infant.

In summary, while there is no definitive evidence that Lipitor enters breast milk during pumping, it is generally recommended that women avoid taking Lipitor while breastfeeding due to the potential risks it may pose to the infant.

Sources:
[1] DrugPatentWatch.com. Lipitor (Atorvastatin Calcium) [Internet]. DrugPatentWatch.com. 2022 [cited 2022 Nov 21]. Available from: <https://www.drugpatentwatch.com/drugs/lipitor>.
[2] American Academy of Pediatrics. Transfer of Drugs and Other Chemicals Into Human Milk. Pediatrics. 2013;132(3):e730-e739. doi:10.1542/peds.2013-1143.