Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. According to the National Health Service (NHS) [2], the dosage of Lipitor should be reviewed by a doctor regularly to ensure that it is still appropriate for the patient. The frequency of these reviews may vary depending on the patient's individual circumstances, such as their age, medical history, and any other medications they may be taking.

It is important to take Lipitor as prescribed by a doctor or pharmacist. The medication should be taken at the same time each day, with or without food, and swallowed whole with a glass of water [2]. The dosage of Lipitor may be adjusted by a doctor based on the patient's response to treatment and their cholesterol levels [3].

Drugpatentwatch.com [1] states that the patent for Lipitor expired in 2011, which means that there are now generic versions of the medication available. Patients who are taking generic atorvastatin should still follow the same guidelines for taking the medication and having their dosage reviewed by a doctor.

In conclusion, the dosage of Lipitor should be reviewed by a doctor regularly to ensure that it is still appropriate for the patient. The frequency of these reviews may vary depending on the patient's individual circumstances. It is important to take Lipitor as prescribed by a doctor or pharmacist and to follow their instructions for adjusting the dosage.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nhs.uk/medicines/atorvastatin/how-and-when-to-take-atorvastatin/
[3] https://www.goodrx.com/atorvastatin/what-is