Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood and reduce the risk of heart attack and stroke. According to the drug label provided by the FDA [3], the recommended starting dose of Lipitor is 10-20 mg once daily. The dosage can be increased up to 80 mg/day in patients with severe hypercholesterolemia or those at high risk for cardiovascular events. However, the dosage should be adjusted based on the patient's response to treatment and individual risk factors.

It is important to note that the dosage of Lipitor may be lowered in certain situations. For example, patients with liver disease or who are taking certain medications may require a lower dose of Lipitor to avoid potential side effects [2]. Additionally, elderly patients and those with renal impairment may require a lower dose of Lipitor due to reduced drug clearance [3].

It is also worth mentioning that Lipitor is available in different strengths, including 10 mg, 20 mg, 40 mg, and 80 mg tablets [1]. Patients should always follow their healthcare provider's instructions regarding the appropriate dose and duration of treatment with Lipitor.

In summary, the recommended starting dose of Lipitor is 10-20 mg once daily, but the dosage may be adjusted based on the patient's response to treatment and individual risk factors. The dosage may also be lowered in certain situations, such as in patients with liver disease or who are taking certain medications. Patients should always follow their healthcare provider's instructions regarding the appropriate dose and duration of treatment with Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://reference.medscape.com/drug/lipitor-atorvaliq-atorvastatin-342446
[3] https://www.accessdata.fda.gov/drugsatfda_docs/label/2009/020702s057lbl.pdf