Pet Safety / Compounds / Ceftiofur

Is Ceftiofur safe for dogs and cats?

Low risk for pets

Used therapeutically in dogs for urinary tract and soft tissue infections. Generally well-tolerated; GI upset is the main side effect.

What is ceftiofur?

The IUPAC name is 2-methylpropyl 2-(4-chloroanilino)-2-oxoacetate.

Also known as: NQWMPQVVQLNBGG-UHFFFAOYSA-N, Oxalic acid, monoamide, N-(4-chlorophenyl)-, isobutyl ester.

IUPAC name: 2-methylpropyl 2-(4-chloroanilino)-2-oxoacetate
CAS number: 80370-57-6
Molecular formula: C19H17N5O7S3
Molecular weight: 523.56 g/mol
SMILES: CO/N=C(\C(=O)N[C@@H]1C(=O)N2C1SCC(=C2C(=O)O)CSC(=O)C)c1cccs1
PubChem CID: 6420884

Risk for dogs

Low risk

Used therapeutically in dogs for urinary tract and soft tissue infections. Generally well-tolerated; GI upset is the main side effect.

Risk for cats

Low risk

Used for respiratory and urinary infections in cats. Injection site pain reported with crystalline free acid formulation.

Regulatory consensus

3 regulatory and scientific bodies have classified Ceftiofur. The classifications differ — that's the data.

Agency	Year	Classification
FDA	2012	Approved (NADA 140-890); extra-label use restricted in food animals (GFI #209/#213)
EU	2010	Annex I — MRL established
WHO	2019	3rd-gen cephalosporin — Critically Important Antimicrobial

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where pets encounter ceftiofur

Veterinary Medicine

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Ceftiofur:

Amoxicillin-clavulanate (narrower spectrum)
Trade-offs: Removes 95-99% of dissolved contaminants including metals, PFAS, nitrates; wastes 2-4 gallons per gallon produced (improving with newer systems); removes beneficial minerals; $0.05-0.25/gallon; requires pre-treatment for longevity.

Relative cost: 1.2-2×
Enrofloxacin (for susceptible pathogens)
Trade-offs: Non-halogenated; no toxic combustion gases (HCl, dioxins); requires higher loading (40-65% by weight vs 5-15% for halogenated FRs); affects material properties (density, flexibility, processability); cost-effective at scale.

Relative cost: 1.2-2×

Frequently asked questions

Is ceftiofur safe for pets?

Used therapeutically in dogs for urinary tract and soft tissue infections. Generally well-tolerated; GI upset is the main side effect.

Why do regulators disagree about ceftiofur?

Ceftiofur has been classified by 3 agencies including FDA, EU, WHO, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See Ceftiofur in the pets app

Look up products containing ceftiofur, compare to alternatives, and explore the full data record.

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Sources (1)

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →