Is Amoxicillin safe for dogs and cats?
Low risk for petsAmoxicillin is one of the most commonly used antibiotics in small animal veterinary medicine; FDA-approved for veterinary use (Amoxi-Tabs, Amoxi-Drop) for skin, urinary tract, and respiratory infections in dogs and cats. Veterinary dosing: 10–25 mg/kg every 8–12 hours in dogs. Spectrum: amoxicillin alone covers many gram-positive and some gram-negative organisms; amoxicillin-clavulanate (Clavamox) is more commonly chosen for empirical treatment of skin infections and UTIs due to improved gram-negative and beta-lactamase-producing organism coverage. Beta-lactam safety in dogs: beta-lactams are among the safest antibiotics for dogs; adverse effects are primarily GI (nausea, vomiting, diarrhea) — giving with food reduces GI effects. Allergy in dogs: true anaphylaxis to penicillins in dogs is rare compared to humans; mast cell degranulation occurs but classic IgE-mediated anaphylaxis is less documented; monitoring for facial swelling, vomiting, or collapse warranted. Amoxicillin for cats: amoxicillin alone provides limited coverage in cats due to different bacterial flora; amoxicillin-clavulanate (Clavamox) is more appropriate for feline infections. Human amoxicillin in pets: pet owners frequently use leftover human amoxicillin for their pets — this is discouraged because: (a) dose may be incorrect, (b) underlying infection may require different spectrum, (c) untreated resistance is driven.
What is amoxicillin?
The IUPAC name is (2S,5R,6R)-6-[[(2R)-2-amino-2-(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid.
Also known as: (2S,5R,6R)-6-[[(2R)-2-amino-2-(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid, Amoxycillin, Amoxicillin anhydrous, Amoxicilline.
- IUPAC name
- (2S,5R,6R)-6-[[(2R)-2-amino-2-(4-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
- CAS number
- 26787-78-0
- Molecular formula
- C16H19N3O5S
- Molecular weight
- 365.4 g/mol
- SMILES
- CC1(C(N2C(S1)C(C2=O)NC(=O)C(C3=CC=C(C=C3)O)N)C(=O)O)C
- PubChem CID
- 33613
Risk for dogs
Low riskAmoxicillin is one of the most commonly used antibiotics in small animal veterinary medicine; FDA-approved for veterinary use (Amoxi-Tabs, Amoxi-Drop) for skin, urinary tract, and respiratory infections in dogs and cats. Veterinary dosing: 10–25 mg/kg every 8–12 hours in dogs. Spectrum: amoxicillin alone covers many gram-positive and some gram-negative organisms; amoxicillin-clavulanate (Clavamox) is more commonly chosen for empirical treatment of skin infections and UTIs due to improved gram-negative and beta-lactamase-producing organism coverage. Beta-lactam safety in dogs: beta-lactams are among the safest antibiotics for dogs; adverse effects are primarily GI (nausea, vomiting, diarrhea) — giving with food reduces GI effects. Allergy in dogs: true anaphylaxis to penicillins in dogs is rare compared to humans; mast cell degranulation occurs but classic IgE-mediated anaphylaxis is less documented; monitoring for facial swelling, vomiting, or collapse warranted. Amoxicillin for cats: amoxicillin alone provides limited coverage in cats due to different bacterial flora; amoxicillin-clavulanate (Clavamox) is more appropriate for feline infections. Human amoxicillin in pets: pet owners frequently use leftover human amoxicillin for their pets — this is discouraged because: (a) dose may be incorrect, (b) underlying infection may require different spectrum, (c) untreated resistance is driven.
Regulatory consensus
2 regulatory and scientific bodies have classified Amoxicillin. The classifications differ — that's the data.
| Agency | Year | Classification | Notes |
|---|---|---|---|
| EPA CTX / Genetox | — | Genotoxicity: negative (Ames: None, 0 positive / 4 negative reports) | |
| EPA CTX / Genetox | — | Genotoxicity: negative (Ames: None, 0 positive / 4 negative reports) |
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 amoxicillin
- Industrial Facilities — Manufacturing plants, Chemical storage areas, Waste treatment sites
- Occupational Environments — Factories, Warehouses, Transportation vehicles
Safer alternatives
Lower-risk approaches that achieve a similar outcome to Amoxicillin:
-
Therapeutic alternatives (consult prescriber)
Trade-offs: Drug-specific. Cannot substitute without medical guidance.Relative cost: 1.2-2×
Frequently asked questions
Is amoxicillin safe for pets?
Amoxicillin is one of the most commonly used antibiotics in small animal veterinary medicine; FDA-approved for veterinary use (Amoxi-Tabs, Amoxi-Drop) for skin, urinary tract, and respiratory infections in dogs and cats. Veterinary dosing: 10–25 mg/kg every 8–12 hours in dogs. Spectrum: amoxicillin alone covers many gram-positive and some gram-negative organisms; amoxicillin-clavulanate (Clavamox) is more commonly chosen for empirical treatment of skin infections and UTIs due to improved gram-negative and beta-lactamase-producing organism coverage. Beta-lactam safety in dogs: beta-lactams are among the safest antibiotics for dogs; adverse effects are primarily GI (nausea, vomiting, diarrhea) — giving with food reduces GI effects. Allergy in dogs: true anaphylaxis to penicillins in dogs is rare compared to humans; mast cell degranulation occurs but classic IgE-mediated anaphylaxis is less documented; monitoring for facial swelling, vomiting, or collapse warranted. Amoxicillin for cats: amoxicillin alone provides limited coverage in cats due to different bacterial flora; amoxicillin-clavulanate (Clavamox) is more appropriate for feline infections. Human amoxicillin in pets: pet owners frequently use leftover human amoxicillin for their pets — this is discouraged because: (a) dose may be incorrect, (b) underlying infection may require different spectrum, (c) untreated resistance is driven.
What products contain amoxicillin?
Amoxicillin appears in: Manufacturing plants (Industrial facilities); Chemical storage areas (Industrial facilities); Factories (Occupational environments); Warehouses (Occupational environments).
See Amoxicillin in the pets app
Look up products containing amoxicillin, compare to alternatives, and explore the full data record.
Open in pets View raw API dataSources (2)
- FDA Prescribing Information: Amoxicillin — beta-lactam aminopenicillin; penicillin allergy anaphylaxis; pediatric AOM high-dose; Augmentin clavulanate combination; veterinary approval Amoxi-Tabs; dental prophylaxis; CDiff risk; cross-reactivity (2023) (2023) — regulatory
- WHO AWaRe Classification of Antibiotics — Access/Watch/Reserve categories; stewardship framework; amoxicillin Access category; ciprofloxacin/azithromycin Watch; vancomycin Reserve; resistance drivers; outpatient prescribing guidance (2023) (2023) — regulatory
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 →