Yes, generic versions of Lipitor are available. Lipitor, which contains the active ingredient atorvastatin, is a medication used to treat high cholesterol levels. It was originally developed and marketed by Pfizer, but its patent expired in November 2011 in the United States [1].

Once a drug's patent expires, other pharmaceutical companies can produce and sell generic versions of the drug. These generic versions must contain the same active ingredient, be therapeutically equivalent, and meet the same manufacturing standards as the brand-name drug [2]. As a result, several generic versions of atorvastatin have been approved by the U.S. Food and Drug Administration (FDA) and are currently available on the market [3].

According to DrugPatentWatch.com, atorvastatin's patent expired in various countries between 2011 and 2016 [1]. This has led to the introduction of multiple generic atorvastatin products, increasing competition and potentially reducing the cost of this medication for consumers and healthcare systems [4].

Sources:

1. [DrugPatentWatch.com - Atorvastatin (Lipitor) Patent Expiration](https://www.drugpatentwatch.com/patent/atorvastatin-lipitor)
2. [U.S. Food and Drug Administration (FDA) - Generic Drugs: Questions and Answers](https://www.fda.gov/drugs/generic-drugs/generic-drugs-questions-and-answers)
3. [U.S. Food and Drug Administration (FDA) - Approved Generic Drugs](https://www.fda.gov/drugs/generic-drugs/approved-generic-drugs-alphabetical-order)
4. [U.S. Food and Drug Administration (FDA) - Competition and Drug Prices](https://www.fda.gov/drugs/postmarket-drug-safety-information-patients-and-providers/competition-and-drug-prices)