Based on the provided sources, there is no direct evidence to suggest that stretching exercises can affect the effectiveness of Lipitor, a medication used to lower cholesterol levels.

The first source, Drug Patent Watch, provides information about Lipitor, including its active ingredient, atorvastatin, and its patent status. However, it does not mention anything about the potential interaction between stretching exercises and Lipitor.

The second source, a study published in the National Center for Biotechnology Information (NCBI) database, focuses on the effects of exercise on statin therapy. It states that exercise, including stretching, can improve cardiovascular health and may have additional benefits when combined with statin therapy. However, the study does not specifically address the impact of stretching exercises on the effectiveness of Lipitor.

The third source, another study published in the NCBI database, explores the effects of statin therapy on muscle function and exercise capacity. It mentions that statins can sometimes cause muscle-related side effects, such as myopathy. However, the study does not discuss the influence of stretching exercises on the effectiveness of Lipitor.

In conclusion, based on the provided sources, there is no direct evidence to suggest that stretching exercises can affect the effectiveness of Lipitor. However, it is always recommended to consult with a healthcare professional or pharmacist for personalized advice regarding medication and exercise interactions.

Sources:
[1] Drug Patent Watch. Lipitor. Retrieved from https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] National Center for Biotechnology Information. Effects of exercise on statin therapy. Retrieved from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3463373/
[3] National Center for Biotechnology Information. Statin therapy, muscle function, and exercise capacity. Retrieved from https://pubmed.ncbi.nlm.nih.gov/28807461/