After reviewing the available information, it is generally understood that Lipitor, a medication commonly prescribed to lower cholesterol levels, begins to affect cholesterol levels within a few weeks to a month of consistent use [1]. However, it's important to note that the maximum benefit of Lipitor may not be realized for up to 6 months of continuous use [1].

Lipitor, also known as atorvastatin, works by blocking a substance your body needs to make cholesterol [2]. It is crucial to maintain a consistent dosage and follow the prescribed regimen for optimal results [1]. Regular exercise, a healthy diet, and other lifestyle modifications are often recommended in conjunction with Lipitor to effectively manage cholesterol levels [1].

It's worth noting that individual responses to Lipitor may vary, and factors such as age, overall health, and the severity of high cholesterol can influence the time it takes for the drug to have a noticeable effect [1].

In summary, Lipitor typically begins to affect cholesterol levels within a few weeks to a month of consistent use, with the maximum benefit realized after approximately 6 months of continuous use [1].

Sources:
[1] DrugPatentWatch.com. (n.d.). Lipitor. Retrieved from https://www.drugpatentwatch.com/drugs/lipitor
[2] Mayo Clinic. (2021, August 13). Atorvastatin (Oral Route) - Mayo Clinic. Mayo Clinic. Retrieved from https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/description/drg-20064554