Merck & Co. Inc.'s Januvia brand medication, used to treat Type 2 diabetes.

More than a decade ago, Italy tried a novel approach to help bring down drug costs: asking pharmaceutical companies to return money to the national health system if some of their medicines failed to work as expected. The effort largely flopped.

The Trump administration is now considering whether to encourage a similar approach. Pharmaceutical executives presented the idea to President Trump at a meeting in January, and the general concept was raised last month in a draft executive order aimed at combating rising drug prices.