On December 1, 2019, medroxyprogesterone acetate (MPA) became a prohibited substance under USEF Equine Drugs and Medications Rules. Due to the length of time MPA may stay in a horses system, the enforcement for this substance will begin on June 1, 2020. This delay in implementation will allow for horses to be withdrawn from the substance, as it can be detected for an extended period of time. The USEF recommends that no horse be administered MPA following December 1, 2019 to ensure compliance with the June 1, 2020 enforcement date.
For additional information, please contact the Equine Drugs and Medications Program at 800-633-2472 or by email: [email protected]