Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. According to the sources provided, there is no clear indication that the dosage of Lipitor is adjusted for effectiveness. However, the recommended starting dose of Lipitor is usually 10-20 mg per day, and the maximum dose is 80 mg per day [1].

The dosage of Lipitor may be adjusted based on the patient's response to the medication and the presence of other medical conditions. For example, patients with liver disease or kidney problems may require a lower dose of Lipitor [2]. Additionally, the dosage of Lipitor may need to be adjusted when taken with certain medications, such as protease inhibitors used to treat HIV [3].

It is important for patients taking Lipitor to follow their doctor's instructions regarding dosage and to report any side effects or changes in their health status. Lipitor should be taken as part of a comprehensive treatment plan that includes a healthy diet and regular exercise [2].

In conclusion, while there is no clear indication that the dosage of Lipitor is adjusted for effectiveness, the dosage may be adjusted based on the patient's response to the medication and the presence of other medical conditions. Patients taking Lipitor should follow their doctor's instructions regarding dosage and report any side effects or changes in their health status.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.aafp.org/pubs/afp/issues/2007/0515/p1487.html
[3] https://www.ncbi.nlm.nih.gov/books/NBK567198/table/lipid_hiv.T.interaction_of_antiretrovira/