Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], the patent for Lipitor expired in 2011, which means that other pharmaceutical companies can now produce generic versions of the drug. This has led to a decrease in the price of atorvastatin and an increase in the number of people taking the drug.

A study published in the Journal of the American College of Cardiology [2] suggests that there is no need to change the dosage of atorvastatin for most patients. The study found that the standard dose of atorvastatin (80mg) was effective in reducing cholesterol levels and preventing heart attacks and strokes in most patients. However, the study also found that some patients may benefit from a higher or lower dose of the drug depending on their individual needs.

The British Heart Foundation [3] recommends that patients taking atorvastatin should have their cholesterol levels checked regularly and their dosage adjusted if necessary. The Foundation also recommends that patients should talk to their doctor if they experience any side effects from the drug.

In summary, while the dosage of atorvastatin may need to be adjusted for some patients, the standard dose of 80mg is effective for most patients. Patients taking atorvastatin should have their cholesterol levels checked regularly and talk to their doctor if they experience any side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5005588/
[3] https://www.bhf.org.uk/informationsupport/heart-matters-magazine/medical/drug-cabinet/statins