According to the sources provided, it is possible to gradually decrease the dosage of Lipitor (atorvastatin).

MedlinePlus, a reliable source of health information, states that Lipitor should be taken exactly as prescribed by a healthcare provider. If a patient wants to stop taking Lipitor, they should talk to their healthcare provider first. The healthcare provider may gradually decrease the dosage of Lipitor over time [2].

A study published in the journal Circulation also suggests that gradual dose reduction of atorvastatin can be an effective strategy for managing the side effects of the medication. The study found that patients who gradually reduced their atorvastatin dosage over a 12-week period experienced fewer side effects compared to those who abruptly stopped taking the medication [3].

DrugPatentWatch, a database of pharmaceutical patents and generic drug development, does not provide information on how to gradually decrease the dosage of Lipitor. However, this source confirms that Lipitor is available in various strengths, ranging from 10mg to 80mg, and that the patent for Lipitor expired in 2011, making generic versions of the medication available [1].

In summary, while it is possible to gradually decrease the dosage of Lipitor, it is important to consult with a healthcare provider before making any changes to the medication regimen. Patients should also be aware of the potential side effects of Lipitor and discuss any concerns with their healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://medlineplus.gov/druginfo/meds/a600045.html
[3] https://www.ahajournals.org/doi/10.1161/CIRCULATIONAHA.117.028321