Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. The dosage of Lipitor is adjusted based on the individual's needs and response to the treatment. According to Drugs.com [3], the usual starting dose of Lipitor is 10 mg once a day, and the maximum dose is 80 mg once a day. The dose can be adjusted at intervals of 2-4 weeks. The goal of treatment is to achieve the desired reduction in LDL cholesterol levels. The recommended target LDL cholesterol levels vary based on the individual's risk factors and medical history.

Medscape [2] recommends that patients who require a reduction in LDL cholesterol levels of less than 30% should start with a dose of 10 mg of Lipitor daily. Patients who require a reduction of more than 45% should start with a dose of 40 mg daily. The dose can be increased to 80 mg daily if necessary. The recommended dose for patients with homozygous familial hypercholesterolemia is 80 mg daily.

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

In summary, the dosage of Lipitor is adjusted based on the individual's needs and response to the treatment. The usual starting dose is 10 mg once a day, and the maximum dose is 80 mg once a day. The dose can be adjusted at intervals of 2-4 weeks to achieve the desired reduction in LDL cholesterol levels. The recommended target LDL cholesterol levels vary based on the individual's risk factors and medical history.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://reference.medscape.com/drug/lipitor-atorvaliq-atorvastatin-342446
[3] https://www.drugs.com/dosage/atorvastatin.html