Species: Cattle
No MRL required
United States
Species: Cattle · Tissue: Edible tissues (excluding milk)
active substance
Zeranol — veterinary medicines
Authorised animal medicines containing Zeranol across national registers. Regulatory residue limits (MRL) and antimicrobial-resistance surveillance are shown when on record. This is a neutral reference and does not provide dosing or veterinary advice.
Reference information only — not veterinary advice and not a dosing source. Always consult a licensed veterinarian before giving any medicine to an animal.
Target species
Cattle
Authorised products
8 authorised products across national registers.
Australia — APVMA PUBCRIS
United States — DailyMed (NLM)
Canada — Health Canada DPD
United States — FDA Green Book
Residue limits (MRL)
Species: Sheep
20 ppb
United States
Species: Sheep · Tissue: Edible tissues (excluding milk)
Antimicrobial resistance surveillance
No antimicrobial-resistance surveillance is recorded for this substance.
Reported adverse events (openFDA)
Spontaneous adverse-event reports that name Zeranol, by species — reported counts, not proven reactions.
Cattle
109 reported events
openFDA
Top reactions: Death (68) · Vaginal prolapse (23) · Increased sexual interest (21) · Lack of efficacy - NOS (19) · Rectal prolapse (10)
Source: openFDA Animal & Veterinary adverse-event reports.
Surveillance reference only — these are spontaneous adverse-event report counts, not proven adverse reactions, not causation and not a measure of any product's risk or safety. Always consult a licensed veterinarian.
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