Lipitor is a medication used to lower cholesterol levels in the body. According to the sources provided, there is no recommended dosage adjustment for elderly patients taking Lipitor.

The first source, Drug Patent Watch [1], provides information about the patent status of Lipitor and does not mention any dosage adjustments for elderly patients.

The second source, a study published in the National Center for Biotechnology Information [2], discusses the safety and efficacy of statins, including Lipitor, in elderly patients. The study concludes that statins are safe and effective for elderly patients, but does not mention any specific dosage adjustments for Lipitor in this population.

The third source, a review article published in the American Family Physician [3], also discusses the use of statins in elderly patients. The article notes that elderly patients may be more susceptible to the adverse effects of statins, but does not provide any specific recommendations for dosage adjustments for Lipitor in this population.

In summary, based on the sources provided, there is no recommended dosage adjustment for Lipitor in elderly patients. However, healthcare providers should consider the potential risks and benefits of Lipitor in this population, and monitor patients closely for any adverse effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6915405/
[3] https://www.aafp.org/pubs/afp/issues/2007/0515/p1487.html