Using Existing Drugs in New Ways to Treat & Cure Diseases of Brain & Body _ Dr. David Fajgenbaum

When Dr. David Fajgenbaum was a 25-year-old medical student, his organs were shutting down. A priest read him his last rites. His doctors, the world’s leading experts on his condition, told his family there was nothing left to try. But as he lay in the ICU, Fajgenbaum had a thought that would redirect his life and career: the seven chemotherapies that had saved him three times were all developed for other cancers. If those drugs worked, why couldn't there be an eighth drug—or a ninth—developed for something else entirely? That question, born from a near-death experience, became the foundation of his life's work: systematically finding new uses for the 4,000 FDA-approved drugs already sitting on pharmacy shelves.

The Blind Spot in Modern Medicine

The central argument of the conversation is that the medical system has a massive blind spot. There are roughly 4,000 FDA-approved drugs, each of which typically binds to 20 to 30 different proteins in the body. Yet each drug is approved for only one or two conditions. Meanwhile, there are about 18,000 human diseases, and roughly 14,000 of them have no approved treatment at all. Fajgenbaum’s core insight is that many of the answers to these untreated diseases may already exist in the form of drugs developed for other purposes. The problem is not a lack of molecules, but a lack of a system to connect them to the right patients.