Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the body. According to the NHS [3], the dosage of Lipitor should be determined by a doctor and taken once a day, preferably at the same time every day. It is recommended to take Lipitor with or after food and to swallow the tablet whole with water.

The duration of Lipitor treatment and dosage increase depends on the individual's cholesterol levels and response to the medication. According to a study published in the Journal of Lipid Research [2], the duration of treatment with Lipitor should be individualized based on the patient's response to therapy. The study found that patients who had a greater reduction in LDL cholesterol levels had a lower risk of cardiovascular events.

Furthermore, the dosage of Lipitor may be increased or decreased based on the individual's response to therapy. According to Drug Patent Watch [1], the recommended starting dose of Lipitor is 10-20 mg once daily, with a maximum dose of 80 mg once daily. The dosage may be increased at intervals of 2-4 weeks, with a maximum dosage increase of 10-20 mg per day.

In conclusion, the duration of Lipitor treatment and dosage increase should be individualized based on the patient's response to therapy. It is important to follow the dosage and administration instructions provided by a doctor or healthcare professional. If there are any concerns or questions about Lipitor treatment, it is recommended to consult with a doctor or healthcare professional.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4354082/
[3] https://www.nhs.uk/medicines/atorvastatin/how-and-when-to-take-atorvastatin/