Since first hitting the shelves nearly 40 years ago, SSRIs have become one of the most commonly prescribed classes of antidepressants around the world, as well as one of the most discussed and misunderstood. This and next week, we tell the story of SSRIs in two parts. In Part 1, we explore the origins of these medications and their predecessors, a surprising journey that takes us back millions of years and across the animal kingdom, and one that proves that John Green was right - everything truly is tuberculosis. How did we get from tuberculosis to Prozac? Tune in to find out.

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