GLP-1 drugs like Ozempic and Mounjaro have transformed the treatment of obesity as well as diabetes, help treat heart disease, kidney disease, sleep apnea, and maybe even Alzheimer’s. But they are far from the only medicine with more than one use. Aspirin, colchicine, minoxidil, and Viagra were all found to treat more conditions than expected, and about a third of drugs end up with a second approved use.
In this episode, Jacob and Saloni explore the idea of drug repurposing: taking a medicine made for one disease and finding it works against others. They trace how GLP-1 drugs emerged from an adorable Gila monster, why some drugs have multiple uses, why so many of those uses go untested, and how patents, competition, prizes, and platform trials shape whether we ever find them.
Hard Drugs is a podcast from Works in Progress about medical innovation presented by Saloni Dattani and Jacob Trefethen.
You can watch or listen on YouTube, Spotify, or Apple Podcasts.
Chapters:
(00:00) - Introduction
(13:20) - The origins of GLP-1 drugs
(46:07) - GLP-1s for everything?
(01:03:33) - Promiscuous drugs
(01:25:04) - Why isn't drug repurposing more common?
Correction: Saloni misdescribed the mechanism of immortal time bias - it comes from the pre-prescription time being counted in the treatment group, not the control group.
Babak Sahragardjoonegani, Reed F Beall, Aaron S Kesselheim, Aidan Hollis (2021). Repurposing existing drugs for new uses: a cohort study of the frequency of FDA-granted new indication exclusivities since 1997. https://pmc.ncbi.nlm.nih.gov/articles/PMC7780607/
Samy Suissa, Laurent Azoulay (2012). Metformin and the risk of cancer: time-related biases in observational studies https://doi.org/10.2337/dc12-0788
Nicholas Reville (2026). Proposing an NIH High-Leverage Trials (HILT) Program. Center for Addiction Science, Policy, and Research (CASPR) https://caspr.org/policy/papers/HILT/
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