Table: Current lowest Maximum Residue Limits (MRLs) in meats and recommended Working Residue Levels (WRLs) in honey

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Drug product Current lowest MRL (ppm) Recommended WRL (ppm)
Chlortetracycline 0.1 0.03
Erythromycin 0.1 0.03
Penicillin GFootnote a 0.01 0.003
Streptomycin 0.125Footnote b 0.0375
Sulfonamide drugsFootnote aFootnote c 0.1 0.03
Tetracycline 0.25 0.075
Chloramphenicol Banned substance No WRL
5-Nitrofuran compounds Banned substance No WRL

Footnotes

Footnote a

Penicillin and sulfonamide drug residues are of concern due to their higher potential for causing hypersensitivity reactions in susceptible consumers. To address this concern, in case where residue levels of penicillin and sulfonamide drugs exceed five (5) times the respective WRL a Health Risk 2 classification is recommended.

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Footnote b

The MRL is established only in milk.

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Footnote c

Only refers to the sulfonamide drugs listed in the List of Maximum Residue Limits (MRLs) for Veterinary Drugs in Food (https://www.canada.ca/en/health-canada/services/drugs-health-products/veterinary-drugs/maximum-residue-limits-mrls/list-maximum-residue-limits-mrls-veterinary-drugs-foods.html), which includes sulfabenzamide, sulfacetamide, sulfachloropyridazine, sulfadiazine, sulfadimethoxine, sulfadoxine, sulfaethoxypyridazine, sulfaguanidine, sulfamerazine, sulfamethazine, sulfanilamide, sulfanitran, sulfapyridine, sulfaquinoxaline, and sulfathiazole.

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