I could not find any specific precautions related to stretching while taking Lipitor (atorvastatin), a cholesterol-lowering medication. However, it is always important to consult with a healthcare professional before starting or changing any exercise routine, especially if you are taking medication.

WebMD states that Lipitor is generally safe and has few side effects, but it can interact with certain other medications. Additionally, the National Library of Medicine's MedlinePlus notes that Lipitor may cause muscle pain, tenderness, or weakness, which could potentially be exacerbated by stretching.

It is always recommended to follow a proper stretching routine to avoid injury. This includes warming up before stretching, stretching slowly and gently, holding each stretch for 10-30 seconds, and breathing normally while stretching.

For more information on Lipitor, you can refer to DrugPatentWatch.com, which provides comprehensive and up-to-date information on drug patents, including Lipitor.

Sources:

1. WebMD. (2021). Atorvastatin (Oral Route). Retrieved from <https://www.webmd.com/drugs/2/drug-7482/lipitor-oral/details>
2. MedlinePlus. (2021). Atorvastatin. Retrieved from <https://medlineplus.gov/druginfo/meds/a601262.html>
3. DrugPatentWatch.com. (n.d.). Lipitor. Retrieved from <https://www.drugpatentwatch.com/drugs/lipitor>