From the HISA Media Team:

HISA Board Votes, Status
Quo Remains for Lasix


May 5, 2026 (Lexington, KY) – The Horseracing Integrity and Safety Authority (HISA) Board of Directors today announced the results of its vote regarding the prohibition and use of furosemide (commonly referred to as “Lasix”) in Covered Horses within the 48-hour period prior to a race.

Pursuant to the Horseracing Integrity and Safety Act of 2020 (the “Act”), HISA’s Board was required to consider whether modification of the existing prohibition on furosemide was warranted. In accordance with the statutory framework, the Board voted unanimously on April 24 to adopt findings required for a modification of the prohibition, which continues the existing regulatory status quo.

Under the Act, any modification required a unanimous board vote on the following four findings:

  1. That the modification is warranted.
  2. That the modification is in the best interest of horse racing.
  3. That furosemide has no performance-enhancing effect on individual horses.
  4. That public confidence in the integrity and safety of racing would not be adversely affected by the modification.

The Board unanimously adopted each of these findings and approved a modification to permit the use of furosemide within 48 hours prior to a race for Covered Horses, with the exception of:

  • 2-year-old Covered Horses; and
  • Covered Horses competing in stakes races.

In reaching its decision, the Board considered the findings and recommendations of the Furosemide Advisory Committee (FAC), which included a finding that available scientific evidence does not support the assertion that furosemide is a performance-enhancing substance.

While the modification will take effect on May 23, 2026, it does not change the current regulatory treatment of furosemide that has been in place since the launch of HISA’s Anti-Doping and Medication Control Program on May 23, 2023. This means that furosemide administration in the 48 hours prior to a race will continue to be permitted for all Covered Horses except 2-year-old Covered Horses and Covered Horses competing in stakes races.

The HISA Board’s resolution and its findings, along with the FAC Report and scientific research reports, can be reviewed by clicking here.

About the Horseracing Integrity and Safety Authority

When the Horseracing Integrity and Safety Act was signed into federal law, it charged the Horseracing Integrity and Safety Authority (HISA) with proposing and enforcing uniform safety and integrity rules in Thoroughbred racing in the United States. Overseen by the Federal Trade Commission (FTC), HISA is implementing, for the first time, a uniform national set of rules applicable to every Thoroughbred racing participant and racetrack facility. HISA has two programs: the Racetrack Safety Program, which went into effect on July 1, 2022, and the Anti-Doping and Medication Control (ADMC) Program, which went into effect on May 22, 2023.

The Racetrack Safety Program includes operational safety rules and national racetrack accreditation standards that seek to enhance equine welfare and minimize equine and jockey injury. The Program expands veterinary oversight, imposes surface maintenance and testing requirements, enhances jockey safety, regulates riding crop use and implements voided claim rules, among other important measures.

The ADMC Program includes a centralized testing and results management process and applies uniform penalties for violations efficiently and consistently across the United States. These rules and enforcement mechanisms are initially administered by an independent body, the Horseracing Integrity & Welfare Unit (HIWU), established by Drug Free Sport International. HIWU oversees testing, educates stakeholders on the Program, accredits laboratories, investigates potential ADMC violations and penalizes any such violations, subject to the FTC’s plenary review.