After reviewing the sources, there is no evidence to suggest that Lipitor, a medication used to lower cholesterol levels, can affect stretching flexibility.

The first source, Drug Patent Watch [1], provides information on the drug's patent status, expiration date, and other relevant data. However, it does not mention anything about Lipitor's potential effects on stretching flexibility.

The second source, a study published in the Journal of Clinical and Diagnostic Research [2], investigates the effects of atorvastatin, the active ingredient in Lipitor, on muscle strength and endurance in healthy individuals. The study concludes that atorvastatin does not significantly affect muscle strength or endurance. However, the study did not investigate the effects of atorvastatin on stretching flexibility.

The third source, a review article published in the Journal of the American Osteopathic Association [3], discusses the potential side effects of statin drugs, including atorvastatin. While the article mentions that some patients may experience muscle pain or weakness as a side effect of statin therapy, it does not mention any effects on stretching flexibility.

In summary, there is no evidence to suggest that Lipitor or atorvastatin, its active ingredient, can affect stretching flexibility. However, if you are experiencing any unusual symptoms while taking Lipitor or any other medication, it is important to speak with your healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://pubmed.ncbi.nlm.nih.gov/30511410/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/