The sources provided do not mention who recommended changing Lipitor dosage. However, they do provide information on Lipitor dosage and proper use. Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol and reduce the risk of heart attack and stroke [3]. 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 to 20 milligrams once a day [2]. However, the dosage may be increased up to 80 milligrams per day in some cases [1]. It is important to follow the dosage instructions provided by the healthcare provider and to take Lipitor regularly to achieve the desired effect [3]. If a patient experiences any side effects or has concerns about their Lipitor dosage, they should consult their healthcare provider for advice [2].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.healthline.com/health/drugs/lipitor-dosage
[3] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/proper-use/drg-20067003