Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to the sources provided, the recommended Lipitor dosage may vary depending on the individual's medical history, current medications, and cholesterol levels.

Drugs.com [1] suggests that the usual starting dose for adults is 10-20 mg once daily, which can be increased up to 80 mg per day. However, the maximum dose of Lipitor may be lower for certain individuals, such as those with kidney problems or who are taking certain medications.

Medscape [2] recommends starting with a lower dose of 10-20 mg once daily, especially for patients who are at higher risk of developing muscle-related side effects. The dosage can be increased gradually, up to a maximum of 80 mg per day, as needed to achieve the desired cholesterol-lowering effect.

Drug Patent Watch [3] provides information on the various dosages and strengths of Lipitor that are available on the market, ranging from 10 mg to 80 mg tablets.

It is important to note that Lipitor should be taken exactly as prescribed by a healthcare provider, and patients should not adjust their dosage without consulting their doctor. Additionally, patients taking Lipitor should be monitored regularly for potential side effects, including muscle pain or weakness.

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