The cost differences for Lipitor generics can vary significantly. Lipitor, the brand-name drug whose active ingredient is atorvastatin, is a prescription medication used to treat high cholesterol levels. According to DrugPatentWatch [1], Lipitor's patent expired in November 2011, which allowed other manufacturers to produce and market generic versions of the drug.

The National Center for Biotechnology Information (NCBI) states that generic drugs are, on average, 80-85% less expensive than their brand-name counterparts [2]. This price difference is primarily because generic manufacturers do not have the same research, development, and marketing costs as brand-name drug manufacturers.

The FDA maintains a list of authorized generic drugs, including atorvastatin [3]. Authorized generics are approved under the same New Drug Application (NDA) as the brand-name drug. Authorized generics can be marketed by the brand-name manufacturer or by other manufacturers under license from the brand-name manufacturer. Authorized generics often enter the market before other generic versions, which can impact the pricing of both the authorized generic and subsequent generic entrants.

However, it is essential to note that the cost of generic Lipitor can still vary based on factors such as the manufacturer, pharmacy, and insurance coverage. To find the best price for a specific situation, it is recommended to consult a healthcare provider or pharmacist.

In summary, generic Lipitor (atorvastatin) is generally much less expensive than the brand-name drug, with an average price reduction of 80-85%. However, the actual cost can vary based on several factors, and it is advisable to consult a healthcare provider or pharmacist for the most accurate and up-to-date pricing information.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4859299/
[3] https://www.fda.gov/drugs/abbreviated-new-drug-application-anda/fda-list-authorized-generic-drugs