November 3, 2003
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The List of Prohibited Substances includes Tetrahydrogestrinone

The International Olympic Committee and the World Anti-Doping Agency would like to advise all stakeholders that Tetrahydrogestrinone (THG) is a steroid contained in the present and next year’s List of Prohibited Substances. Gestrinone is namely included on the List of Prohibited Substances and THG, which has a similar chemical structure, therefore must be considered as an analogue and as a consequence is a prohibited substance.


THG will be analyzed as part of the steroid class of substances both in competition and out of competition analyses.