GBGB recognises that many trainers and veterinarians are reluctant to use currently licensed products, namely testosterone (Durateston), megoestrol acetate (Ovarid), proligestone (Delvosteron) and medroxyprogesterone acetate (Promone E) to suppress a bitch’s season. 

Following discussions with the Government’s Veterinary Medicines Directorate, we are pleased to confirm that from 23rd March 2011, veterinary surgeons will be allowed to prescribe norethisterone (Primolut-N) as a season suppressant in greyhound bitches. 

Any trainer wishing to use norethisterone must note the following conditions: 

  1. Norethisterone must only be used under prescription from a veterinary surgeon. The Veterinary Medicines Directorate has specified that vets must use their clinical judgement but can prescribe norethisterone under what is known as the cascade system. This means that although the drug is not licensed for use in greyhounds it may be used under certain circumstances. 
  2. Trainers must record all use of norethisterone in their GBGB Treatment Book. Stipendiary Stewards will rigorously monitor Treatment Books during kennel inspections and trainers that do not maintain their books in accordance with Rule 216 are likely to face disciplinary action. 
  3. The suppression of a bitch must be reported to the Racing Manager at a GBGB Racecourse in accordance with Rule 57. 

Should you have any queries please don’t hesitate to contact your local Stipendiary Steward or the GBGB Veterinary Advice Line on 020 7822 0913

Guidance Notes for Veterinary Surgeons

Norethisterone Guidance Notes (PDF)