Permitted Medications
Once a horse has been entered to race, the only two permitted medications that may be given are Phenylbutazone and Furosemide.


  • 2 gm of bute may be given orally or by injection up to 24 hours before race time and must not exceed the threshold of 5 ug/ml.
  • Bute is not permitted for two year olds.
  • No notification is required for using bute.

Furosemide (Lasix)

  • 2 to 5 mls (100-250 mg) of Furosemide may be given intravenously no later than three hours before post.
  • Stewards may grant a 30-minute grace period if a horse is late arriving to the track.
  • Furosemide is administered by private vets at a designated site.
  • Furosemide is not permitted in two-year-old Standardbreds.
  • Furosemide eligibility is determined by previous usage, bleeder certificate, authorization from another jurisdiction or submission of a MGCB Furosemide Request Form.
  • Request for removal from the furosemide eligibility list requires written notification by the trainer to a MGCB veterinarian no later than administration time of the subsequent race.

Total CO2 (TCO2) Testing
Harness Racing: TCO2 testing may be performed before warm-up, before post parade or two hours after a race as determined by the MGCB veterinarian.

Flat Racing: TCO2 testing may be performed before arrival at the saddling paddock or two hours after a race as determined by the MGCB veterinarian.

The TCO2 threshold for Furosemide and non-Furosemide users is 37 mmol/L. If testing is done on site, the trainer will be informed if a test result is over the threshold. After the initial overage, a second sample will be taken and analyzed in view of the trainer. If the second test is also over the threshold, the horse will be scratched.

Coggins Testing and Health Certificates
All horses racing in Michigan must have a negative Coggins test. A Coggins test is valid for one year. Any horse arriving at the track from other jurisdictions must have a valid health certificate to enter the grounds. All trainers are advised to stay current with Michigan Department of Agriculture and Rural Development regulations.

Equine Herpes Virus (EHV) Vaccination Requirements
All horses entering a Michigan pari-mutuel racetrack must have proof of EHV vaccination within the last six months. The vaccination certificate must be submitted to a MGCB veterinarian before time of entry and must include the trainer’s name, the signature and phone number of the vet giving the vaccination, the horse’s registered name, the date given, and the product name. Horses arriving at the entry gate of a racetrack should have a copy of their vaccination certificate to show the security guard.

Equine Protozoal Myelitis (EPM)
Trainers with horses being treated with Sulfa/Trimethoprim to prevent the reoccurrence of EPM symptoms must supply the required paperwork to the MGCB veterinarian before time of entry. EPM forms must be filled out on an annual basis. Submission of the EPM form allows administration of the Sulfa/Trimethoprim up until 48 hours before post.

Cornell Collar
Trainers must submit proof to the MGCB veterinarian that his/her private vet has prescribed the use of a Cornell Collar and the trainer has been instructed in its proper use. A written request is also necessary to discontinue use.

All horses competing after a posterior digital neurectomy must provide notice to the MGCB veterinarian and be included on the Heel Nerved Horse list.

Veterinarian’s Unable to Perform List (Vet List)
A horse placed on the Vet’s List must be released before entry. The requirements for release from the Vet’s List vary with the reason the horse was placed on the list. Contact the MGCB veterinarian if you have not been told the requirements for release.

Off-Track Use of Medications
The horse racing law of 1995 states it is a violation for any licensee to have in their possession within the confines of an off-track stable any drug not authorized by the MGCB executive director for use at those locations. The executive director authorizes the use of FDA-approved, properly prescribed and labeled therapeutic medications at these sites. Questions on off-track use of medications should be addressed to the MGCB at (313) 456-0236.