Lipitor, also known as atorvastatin, is a cholesterol-lowering medication used to treat high cholesterol and heart disease [1]. The effectiveness of Lipitor can vary depending on several factors, such as the dose and individual patient response.

According to the Lipitor patent information on DrugPatentWatch.com [2], the original patent for atorvastatin expired in 2011 in the United States. However, it's worth noting that generic versions of the medication were not immediately available due to the existence of a patent settlement, also known as a "patent dance," which delayed the entry of generic competition.

Currently, several generic versions of Lipitor are available on the market, which has increased competition and potentially reduced the price of the medication. However, the effectiveness of generic Lipitor is similar to that of the brand-name version.

Patients taking Lipitor should follow their prescribed dosage and regimen as directed by their healthcare provider. If you have concerns about the effectiveness of your Lipitor or have questions about your treatment, it's best to consult with your doctor or pharmacist.

Sources:

[1] https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route-side-effects/drg-20064335
[2] https://www.drugpatentwatch.com/patent/US_6048740/