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AgVetLink Special issue for Veterinarians May 2006

Restricted Substances

The restricted substances list is included below as a reference. The presence of residues of these substances in exported product can have significant impacts on trade.

Veterinarians need to be particularly careful when considering off-label use of these drugs, compounding or sourcing products used in human medicine.

Chloramphenicol is an example of a drug that is frequently reported as a residue in internationally traded produce. Registered products containing this active have not been available in New Zealand for 20 years. Injectable and ophthalmic human preparations containing chloramphenicol must not be used in food-producing animals.

Topical products containing nitrofurazone were commonly used to treat teat lesions in dairy cows. Nitrofurazone was removed from these products in 2002. Because products are still available for treating small animals and horses, it is critical that people using these drugs understand they are not to be used for other than the prescribed reason. Remind clients to dispose of any product remaining in dairy sheds.

Restricted Substances

Our major overseas trading partners have banned the substances listed below. In consequence, these substances may not be used at any time during the life of an animal from which any product may be taken and exported from New Zealand for human consumption.

• All compounds of the nitrofuran class of compound, including but not limited to nitrofurazone, furaltadone, ninhydrazone, furazolidone

• All compounds that exert a thyreostatic action: methyl thiouracil, phenyl thiouracil, propyl thiouracil

• Beta sympathomimetic agents: cimetarol, salbutamol

• All compounds of the nitroimidazole class of compound, including but not limited to metronidazole or ronidazole

• Arsenilic acid

• Chloramphenicol

• Chloroform

• Chlorpromazine

• Colchichine

• Dapsone

• Diethylstilbestrol

• Nandrolone

• Phenylbutazone