Lipitor is a medication used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], the dosage of Lipitor varies depending on the patient's condition and response to treatment. It is important to consult a healthcare provider to determine the appropriate dosage for each individual.

The American College of Cardiology and American Heart Association released guidelines for the management of blood cholesterol in 2018 [2]. These guidelines recommend using the ASCVD Risk Estimator Plus to assess a patient's 10-year risk of atherosclerotic cardiovascular disease (ASCVD). The guidelines also recommend statin therapy for patients with an LDL-C level of 190 mg/dL or higher, patients with diabetes who are between 40 and 75 years old, and patients with a 10-year ASCVD risk of 7.5% or higher. The guidelines suggest reevaluating the patient's lipid profile 4 to 12 weeks after starting statin therapy and then every 3 to 12 months thereafter to monitor for side effects and assess response to therapy.

UpToDate [3] also recommends regular monitoring of lipid levels after starting statin therapy. The frequency of monitoring depends on the patient's baseline lipid levels, risk factors for ASCVD, and response to therapy. The article suggests monitoring lipid levels 4 to 12 weeks after starting therapy and then every 3 to 12 months thereafter.

In summary, the appropriate time to reevaluate Lipitor dosage depends on the patient's condition, response to treatment, and risk factors for ASCVD. It is important to consult a healthcare provider to determine the appropriate dosage and monitoring schedule for each individual.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.acc.org/~/media/Non-Clinical/Files-PDFs-Excel-MS-Word-etc/Guidelines/2018/Guidelines-Made-Simple-Tool-2018-Cholesterol.pdf
[3] https://www.uptodate.com/contents/low-density-lipoprotein-cholesterol-lowering-therapy-in-the-primary-prevention-of-cardiovascular-disease