Lipitor is a medication that is used to lower cholesterol levels in the blood [1]. According to the FDA, the use of Lipitor is contraindicated during breastfeeding as it may pass into the breast milk and cause harm to the nursing infant [2]. The FDA has classified Lipitor as a pregnancy category X drug, which means that it has the potential to cause fetal harm when administered during pregnancy [2]. According to the National Center for Biotechnology Information, there is limited information available on the use of Lipitor during breastfeeding, and it is recommended that women who are breastfeeding should avoid taking Lipitor unless it is absolutely necessary [3].

In conclusion, based on the sources provided, it is not safe to take Lipitor while breastfeeding as it may cause harm to the nursing infant. Women who are breastfeeding should avoid taking Lipitor unless it is absolutely necessary and they have consulted with their healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.fda.gov/media/150774/download
[3] https://www.ncbi.nlm.nih.gov/books/NBK501361/