Which of these medical products was developed by a major pharmaceutical company but became a notable market failure despite initial FDA approval?

In the fast-paced world of medical product development, some innovations dramatically changed healthcare delivery while others faced surprising challenges. This trivia question explores a famous product failure in medical technology that initially seemed promising but ultimately couldn't survive in the market. Test your knowledge of medical product history and the complex factors that determine commercial success in healthcare.

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Exubera (inhaled insulin powder) by Pfizer, withdrawn after only one year due to poor sales and patient acceptance issues
Lipitor (atorvastatin) by Pfizer, which failed to achieve market traction despite extensive marketing campaigns
Epclusa (sofosbuvir/velpatasvir) by Gilead, withdrawn after manufacturing contamination concerns
Januvia (sitagliptin) by Merck, discontinued after initial strong sales due to unexpected clinical trial results