Atorvastatin, commonly known by the brand name Lipitor, was one of the best-selling prescription drugs globally until its patent expiration in 2011 [1]. The price reduction for Lipitor has been significant since its patent expiration.
In November 2011, Pfizer allowed several generic versions of Lipitor to enter the US market, which had a substantial impact on its price. According to [DrugPatentWatch.com][2], after the patent expiration, the average wholesale price of Lipitor declined by approximately 90% over two years, from more than $2 per day to less than $2 per week [3].
Generic versions of Lipitor were introduced by several manufacturers, including Ranbaxy (now known as Lupin), Watson Pharmaceuticals (now known as Actavis), and Mylan, among others. These generic versions are manufactured at lower costs and are sold at lower prices, which has further contributed to the overall price reduction.
It's essential to note that price reductions can vary across different regions and suppliers. Patients may be able to find more affordable versions of atorvastatin through generic brands or by using coupons and savings programs offered by pharmacies and pharmaceutical companies.
Sources:
[1] Wikipedia. Atorvastatin.
[2] DrugPatentWatch.com
[3] DrugPatentWatch.com. Atorvastatin.