The Forgotten Pill That Began the Birth-Control Revolution-One Atom Away
A tiny chemical tweak in a Berlin lab in 1938 produced an oral hormone that erased the need for injections-and yet the molecule that opened the door, ethisterone, vanished from medicine's memory decades later. How did a drug prescribed under multiple brand names from 1939 to 2000 persist without scandal and then disappear so completely, and what changed when a single carbon atom was removed to create its more famous successor?
In this episode, we tell the story of four chemists at Schering AG whose routine modification of testosterone accidentally created the first orally active progestogen, and follow that compound's journey from Proluton C/Pranone across continents and decades. What did ethisterone actually do in patients, why did dosing vary so widely, and how did one atom make the difference between a footnote and a revolution?
Person: Hans Herloff Inhoffen, Willy Logemann, Walter Hohlweg, Arthur Serini
Date: 1938 (synthesis), 1939 (appearance in Germany), 1945 (arrived in United States), 2000 (off market)
Location: Berlin, Germany
Compound: Ethisterone (marketed as Proluton C and Pranone)
Dose range: 5 mg, 10 mg, 25 mg; full course 200-700 mg over 10-14 days
- Ethisterone was synthesized in 1938 by four chemists at Schering AG in Berlin.
- The compound reached the German market in 1939 and the U.S. market in 1945 under the name Pranone.
- Tablets were produced in 5 mg, 10 mg, and 25 mg strengths with full endometrial courses of 200-700 mg over 10-14 days.
- Ethisterone bound progesterone receptors at roughly 44% of progesterone's affinity.
- Ethisterone remained on the market until the year 2000, forty-three years after its successor had arrived.
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