There's something strange going on in hospitals. Cheap, common drugs that nurses use every day seem to be constantly hit by shortages. These are often generic drugs that don't seem super complicated to make, things like dextrose and saline (aka sugar water and salt water).So what's going on? The answer, as with anything in healthcare, is complicated.On today's show: why hospitals keep running out of generic drugs. The story behind these shortages tells us a lot about how these drugs are made, bought and sold-and, it shows us how these markets can falter without the proper care.This episode was hosted by Sally Helm and Alexi Horowitz-Ghazi. It was produced by Willa Rubin, with help from James Sneed and Sam Yellowhorse Kesler. It was edited by Martina Castro. Fact-checking by Dania Suleman. Planet Money's executive producer is Alex Goldmark.Help support Planet Money and hear our bonus episodes by subscribing to Planet Money+ in Apple Podcasts or at plus.npr.org/planetmoney.