Prohibited and restricted substances

Find out about veterinary medicines that have restrictions on their use in New Zealand.

List of prohibited veterinary medicines

Our major overseas trading partners have banned the substances listed below. These substances must not be used at any time on an animal if products from it could be exported for human consumption.

  • All compounds of the nitrofuran class of compounds, including nitrofurazone, furaltadone, ninhydrazone, furazolidone
  • All compounds that have a thyreostatic action (control thyroid hormones): methyl thiouracil, phenyl thiouracil, propyl thiouracil
  • Beta sympathomimetic agents: cimetarol, salbutamol
  • All compounds of the nitroimidazole class of compounds, including metronidazole and ronidazole
  • Arsenilic acid
  • Chloramphenicol
  • Chloroform
  • Chlorpromazine
  • Colchichine
  • Dapsone
  • Nandrolone (as depot formulations, growth promotants, and with witholding periods over 15 days)
  • Phenylbutazone
  • Stanozolol (as depot formulations, growth promotants, and with witholding periods over 15 days)

Phenylbutazone in horses

Phenylbutazone is listed as a restricted substance because of a European Union (EU) ban on its use in food-producing animals.

The issue with its use in horses relates to horses as food-producing animals. However, a large number of horses in New Zealand will never be used for food.

MPI is aware that phenylbutazone is often a preferred drug to treat horses, so vets:

  • may use phenylbutazone to treat horses if they are not intended for food 
  • should advise animal owners of the EU ban if it's likely the horse will be used for food.
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