Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. The dosage of Lipitor depends on the patient's condition, medical history, and response to treatment. According to the FDA label [2], the recommended starting dose of Lipitor is 10-20 mg once daily. The maximum recommended dose is 80 mg once daily. The dosage may be adjusted based on the patient's response to treatment and the potential for adverse reactions.

The dosage of Lipitor may also be affected by the expiration of the drug's patent. According to Drug Patent Watch [1], the patent for Lipitor expired in 2011. This means that generic versions of the drug are available, which may have different dosages and formulations than the brand-name version.

Medscape [3] notes that the dosage of Lipitor may need to be adjusted in patients with certain medical conditions, such as liver disease or kidney disease. Additionally, certain medications may interact with Lipitor and affect the dosage needed. It is important to consult with a healthcare provider before adjusting the dosage of Lipitor or any other medication.

In summary, the recommended dosage of Lipitor ranges from 10-80 mg once daily, depending on the patient's condition and response to treatment. The expiration of the drug's patent may also affect the dosage and formulation of the medication. Patients with certain medical conditions or taking certain medications may require a different dosage of Lipitor. It is important to consult with a healthcare provider before adjusting the dosage of Lipitor.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.accessdata.fda.gov/drugsatfda_docs/label/2019/020702s073lbl.pdf
[3] https://reference.medscape.com/drug/lipitor-atorvaliq-atorvastatin-342446