Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the body. According to the drug patent watch [1], Lipitor is approved for use in adults and children who are at least ten years old. The dosage of Lipitor varies depending on the patient's age, medical condition, and response to treatment. The recommended starting dose for most adults is 10 mg once daily, which can be increased to a maximum dose of 80 mg once daily if necessary. However, the dosage for elderly patients may differ.

A study published in the National Center for Biotechnology Information [2] suggests that the dosage of Lipitor for elderly patients should be individualized based on their age, weight, and overall health status. The study also states that elderly patients may require a lower dose of Lipitor due to the potential for increased side effects, such as muscle pain and weakness.

Drugs.com [3] also recommends starting elderly patients on a lower dose of Lipitor, typically 5 mg once daily. The dosage can then be gradually increased over time based on the patient's response to treatment and any potential side effects.

In summary, the dosage of Lipitor for elderly patients should be individualized based on their age, weight, and overall health status. Elderly patients may require a lower starting dose of Lipitor and should be monitored closely for potential side effects. It is important for elderly patients to consult with their healthcare provider to determine the appropriate dosage of Lipitor for their specific medical condition.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6915405/
[3] https://www.drugs.com/dosage/lipitor.html