Lipitor is a medication used to lower cholesterol levels in the body [1]. According to Healthline, the dosage of Lipitor is usually based on a person's medical condition, response to treatment, and other medications they may be taking [2]. Weight loss can potentially affect the dosage of Lipitor needed, as losing weight can also lead to a decrease in cholesterol levels [3]. However, it is important to note that any changes to the dosage of Lipitor should only be made under the guidance of a healthcare professional.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.healthline.com/health/drugs/lipitor
[3] https://www.medicalnewstoday.com/articles/lipitor