Lipitor is a medication used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], Lipitor's patent expired in 2011, making it available as a generic drug. Lipitor has been used for decades, and its effectiveness in lowering cholesterol levels has been established. However, there have been concerns about its safety, particularly in high doses.

A study published in the National Center for Biotechnology Information [2] found that Lipitor was generally well-tolerated and effective in reducing cholesterol levels. The study concluded that Lipitor could be safely used in patients with high cholesterol levels, but close monitoring was necessary, particularly in patients with underlying medical conditions.

Another study published in Circulation Research [3] found that Lipitor had a protective effect on the heart and reduced the risk of cardiovascular disease. The study suggested that Lipitor could be used as a preventive measure in patients at risk of heart disease.

In conclusion, Lipitor can be safely reintroduced for the treatment of high cholesterol levels. However, close monitoring is necessary, particularly in patients with underlying medical conditions. Additionally, Lipitor has been shown to have a protective effect on the heart and can be used as a preventive measure in patients at risk of heart disease.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3070374/
[3] https://www.ahajournals.org/doi/full/10.1161/CIRCRESAHA.118.312782