Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. The dosage of Lipitor is usually adjusted based on the patient's response to treatment and their cholesterol levels. According to the American Academy of Family Physicians [3], the initial dose of Lipitor is usually 10-20 mg once daily, and the dosage can be increased every 2-4 weeks as needed to achieve the desired cholesterol-lowering effect. The maximum recommended dose of Lipitor is 80 mg once daily.

Medscape [2] notes that the dosage of Lipitor may need to be adjusted in patients with certain medical conditions, such as liver disease or kidney disease. In these patients, the dosage may need to be lower than the usual starting dose of 10-20 mg.

DrugPatentWatch [1] provides information on the patents for Lipitor, but does not provide information on dosage adjustments.

In summary, the dosage of Lipitor is usually adjusted based on the patient's response to treatment and their cholesterol levels. The initial dose is usually 10-20 mg once daily, and the dosage can be increased every 2-4 weeks as needed to achieve the desired cholesterol-lowering effect. The maximum recommended dose of Lipitor is 80 mg once daily. Patients with certain medical conditions may require a lower starting dose.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://reference.medscape.com/drug/lipitor-atorvaliq-atorvastatin-342446
[3] https://www.aafp.org/pubs/afp/issues/2007/0515/p1487.html