Lipitor is a medication used to lower cholesterol levels in the blood. While there is no direct evidence that suggests swimming while taking Lipitor is unsafe, there are a few factors to consider. According to the drug label provided by Drug Patent Watch [1], Lipitor can cause muscle pain, tenderness, or weakness, which could potentially affect a person's ability to swim. It is recommended that patients taking Lipitor should report any unexplained muscle pain, tenderness, or weakness to their healthcare provider immediately.

A study published in the Journal of Clinical Lipidology [2] suggests that statin medications, such as Lipitor, may reduce exercise performance and muscle strength in some patients. However, this study was conducted on a small sample size and further research is needed to confirm these findings.

Additionally, it is important to note that consuming grapefruit or grapefruit juice while taking Lipitor can increase the risk of side effects [3]. Grapefruit contains a compound that can interfere with the breakdown of Lipitor in the body, leading to higher levels of the medication in the bloodstream. This can increase the risk of side effects, including muscle pain and weakness.

In conclusion, while there is no direct evidence to suggest that swimming while taking Lipitor is unsafe, patients should be aware of the potential side effects of the medication, including muscle pain, tenderness, or weakness. It is recommended that patients report any unexplained muscle pain to their healthcare provider immediately. Additionally, patients should avoid consuming grapefruit or grapefruit juice while taking Lipitor to reduce the risk of side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://pubmed.ncbi.nlm.nih.gov/25093910/
[3] https://www.health.harvard.edu/heart-health/grapefruit-juice-and-statins