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It features an interview with Tilli Tansey, Professor of History of Modern Medical Sciences at University College London (UCL), recorded in the Wellcome Library. Prof Tansey and the show's presenter, Dr Mark Porter, discuss the history of the drug and its manufacture by pharmaceutical companies, including Burroughs Wellcome & Co - the business co-founded by Sir Henry Wellcome.
For UK listeners, the episode is available through the BBC's iPlayer for the rest of the week.