Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. According to the sources provided, there is no specific dosage adjustment for elderly patients taking Lipitor. However, it is important to consider certain factors that may affect the metabolism and elimination of the drug in this population.

The drug patent watch [1] provides information on the dosages available for Lipitor, ranging from 10mg to 80mg. It does not mention any specific dosage adjustments for elderly patients.

A study published in the National Center for Biotechnology Information [2] suggests that elderly patients may have a slower metabolism and clearance of atorvastatin compared to younger patients. However, the study did not find a significant difference in the effectiveness of the drug between the two groups. Therefore, the authors suggest that no dosage adjustment is necessary for elderly patients.

Medscape [3] also states that no dosage adjustment is necessary for elderly patients taking Lipitor. However, it recommends monitoring liver function tests in this population due to the increased risk of liver problems associated with the use of statins.

In summary, while there is no specific dosage adjustment for elderly patients taking Lipitor, it is important to consider the potential effects of aging on the metabolism and elimination of the drug. Monitoring liver function tests may also be necessary in this population.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6915405/
[3] https://reference.medscape.com/drug/lipitor-atorvaliq-atorvastatin-342446