Lipitor (Atorvastatin) is the best-selling drug of all time. Between when it was introduced in 1997 and its patent expiration in 2011, it generated ~$125 billion in sales for Pfizer. In 2018, it was the most commonly prescribed medication in the US, with more than 112 million prescriptions. – WTF Fun Facts
Source: https://en.wikipedia.org/wiki/Atorvastatin