Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. According to the National Health Service (NHS) [3], the recommended starting dose for Lipitor is 10 mg once a day for most people. However, the dose may vary depending on individual circumstances, and a doctor may prescribe a higher dose of up to 80 mg once a day for some patients. It is important to take the medication exactly as prescribed by the doctor, and not to change the dose without consulting them first.

The duration of treatment with Lipitor depends on the individual's response to the medication, as well as their overall health and medical history. According to a study published in the Journal of the American College of Cardiology [2], treatment with atorvastatin was associated with a significant reduction in cardiovascular events in patients with high cholesterol levels. The study found that patients who took atorvastatin for at least two years had a lower risk of cardiovascular events compared to those who took the medication for a shorter period.

Drug Patent Watch [1] provides information on the patent status of Lipitor, but does not offer guidance on how often to take the medication at higher dosages. It is important to follow the doctor's instructions and to take the medication as prescribed, even if the dosage is higher than the starting dose.

In conclusion, the recommended starting dose for Lipitor is 10 mg once a day for most people, but a doctor may prescribe a higher dose of up to 80 mg once a day for some patients. The duration of treatment depends on individual circumstances, and it is important to take the medication exactly as prescribed by the doctor. Patients should consult their doctor if they have any questions or concerns about their medication.

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/