Formestane is an aromatase inhibitor and an anti-estrogenic substance. It can block the conversion of androgens into oestrogens. It can therefore be classified as a selective estrogen receptor modulator (SERMS). In the Australian Rules of Racing, compounds listed in Schedule 1, Part 1, Division 1 as prohibited substances include but are not limited to SERMS. Formestane is thus considered a prohibited substance under the Rules of Racing.
What is Formestane?