Lipitor is a medication used to lower cholesterol levels in the blood, and it is known to have some side effects. However, the sources provided do not mention any side effects specifically related to stretching while taking Lipitor.

According to Drug Patent Watch [1], some common side effects of Lipitor include headache, muscle pain, weakness, and nausea. However, these side effects are not necessarily related to stretching.

A study published in the Journal of the American College of Cardiology [2] found that Lipitor can cause muscle damage in some patients, but again, this study does not mention any specific side effects related to stretching.

Another study published in the journal Clinical Therapeutics [3] found that Lipitor was generally well-tolerated by patients, but some patients did experience muscle pain or weakness. However, this study also did not mention any specific side effects related to stretching.

In conclusion, while Lipitor may have some side effects, the sources provided do not mention any side effects specifically related to stretching. If you are concerned about any potential side effects of Lipitor, it is best to consult with your healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/
[3] https://pubmed.ncbi.nlm.nih.gov/22288788/