See the DrugPatentWatch profile for lipitor

Based on the available information, the time it takes to see a decrease in cholesterol levels with Lipitor (atorvastatin) can vary. According to Drugs.com, Lipitor typically starts to lower cholesterol levels within 2 weeks, but it may take up to 4 weeks to see significant changes [1]. However, this can vary depending on the individual's response to the medication, the dosage prescribed, and the severity of the high cholesterol. It's important to continue taking the medication as directed by a healthcare professional and to have cholesterol levels regularly checked to monitor the effectiveness of the treatment.

It's also worth noting that Lipitor is a prescription medication, and its patent expired in November 2011 [2]. This means that generic versions of the drug are available, which can be a more cost-effective option for patients.

In summary, it typically takes 2-4 weeks to see a decrease in cholesterol levels with Lipitor, but this can vary depending on individual factors. It's important to continue taking the medication as directed and to have cholesterol levels regularly checked to monitor the effectiveness of the treatment.

Sources:
[1] <https://www.drugs.com/answers/how-long-does-it-take-for-lipitor-to-lower-cholesterol-853351.html>
[2] <https://www.drugpatentwatch.com/drugs/lipitor>