Based on the information available, there is no direct interaction between Lipitor (atorvastatin) and swimming. Lipitor is a medication used to treat high cholesterol levels, and swimming is a physical activity.

Swimming, like any other form of exercise, can help increase HDL (good) cholesterol levels and decrease LDL (bad) cholesterol levels, which can complement the effects of Lipitor. However, it is important to note that strenuous exercise, including swimming, may cause muscle injury, and in rare cases, rhabdomyolysis, a condition that can lead to kidney damage. This risk may be slightly increased when taking Lipitor, as the drug carries a warning for this potential side effect.

Therefore, it is always recommended to consult with a healthcare professional before starting or changing any exercise routine while taking medication.

Sources:

1. U.S. National Library of Medicine. (2019). Atorvastatin. MedlinePlus. <https://medlineplus.gov/druginfo/meds/a601245.html>
2. American Heart Association. (2021). Swimming: A Great Way to Get Heart-Healthy. <https://www.heart.org/en/healthy-living/fitness/swimming>
3. Drugs.com. (2021). Atorvastatin. <https://www.drugs.com/atorvastatin.html>
4. Lipitor.com. (2021). Important Safety Information. <https://www.lipitor.com/important-safety-information>
5. DrugPatentWatch.com. (2021). Lipitor (Atorvastatin) Drug Profile. <https://www.drugpatentwatch.com/drugs/lipitor>