Amoxicillin for Chickens

Livestock · Gallus gallus domesticus · typical adult weight 0.50–5.00 kg

Amoxicillin is dosed at 15 mg/kg PO q24h x 3 days in chickens, per Elviss NC, Williams LK, Jørgensen F, et al. Amoxicillin therapy of poultry flocks: effect upon the selection of amoxicillin-resistant commensal Campylobacter spp. J Antimicrob Chemother. 2009;64:702-711. — Mined from Carpenter's Exotic Animal Formulary, 6th Ed, p.617 (2026-08-01, PENDING REVIEW) doi:10.1093/jac/dkp277. Amoxicillin is used in chickens for Bacterial infection. Routes documented in chickens: PO. A typical adult chicken weighs 0.50–5.00 kg. ExoticRx lists 1 cited dose rule for Amoxicillin in chickens, drawn from published veterinary references. Verify against current literature before clinical use.

US trade names: Amoxi-Tabs, Amoxil

Contraindicated in Rabbit, Guinea Pig, Chinchilla, Hamster, Degu

Rabbit: Oral beta-lactams cause fatal dysbiosis in rabbitsOral amoxicillin (and other oral beta-lactams) selectively destroy gram-positive hindgut flora in rabbits, allowing Clostridium spiroforme overgrowth and fatal enterotoxemia. Never administer oral beta-lactams to rabbits. Parenteral administration carries a lower risk than the oral route, but is not established as safe in rabbits.
Guinea Pig: Oral beta-lactams cause fatal dysbiosis in guinea pigsOral amoxicillin reliably causes Clostridium difficile-mediated fatal enterotoxemia in guinea pigs. Same mechanism as in rabbits. Parenteral administration carries a lower risk than the oral route; parenteral ceftiofur specifically has been given to guinea pigs and chinchillas without adverse effect.
Chinchilla: Oral beta-lactams cause fatal dysbiosis in chinchillasChinchillas are hindgut fermenters with the same flora dependence as rabbits and guinea pigs. Oral penicillins and oral cephalosporins trigger Clostridium overgrowth and fatal enterotoxemia. Never give oral beta-lactams; parenteral routes and trimethoprim-sulfa, fluoroquinolones, or chloramphenicol are the safer choices.
Hamster: Oral beta-lactams cause fatal enterocolitis in hamstersHamsters are exquisitely susceptible to antibiotic-associated Clostridium difficile enterocolitis — the hamster is the classic laboratory model for it. Oral penicillins and cephalosporins are reliably fatal. Never administer oral beta-lactams.
Degu: Oral beta-lactams risk fatal dysbiosis in degusDegus are caviomorph hindgut fermenters closely related to chinchillas and guinea pigs. Degu-specific data is limited, so this warning is extrapolated from those related hystricomorphs — but the shared physiology makes oral beta-lactam enterotoxemia the expected outcome. Treat as contraindicated; use the safer alternatives.

Dose ranges

Route	Dose	Frequency	Indication	Evidence	Source
PO	15 mg/kg	q24h x 3 days	Bacterial infection	Moderate	Elviss NC, Williams LK, Jørgensen F, et al. Amoxicillin therapy of poultry flocks: effect upon the selection of amoxicillin-resistant commensal Campylobacter spp. J Antimicrob Chemother. 2009;64:702-711. — Mined from Carpenter's Exotic Animal Formulary, 6th Ed, p.617 (2026-08-01, PENDING REVIEW) doi:10.1093/jac/dkp277

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Mechanism of action

Inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs).

Side effects & warnings

CONTRAINDICATED in rabbits, guinea pigs, and hamsters (fatal dysbiosis). May cause GI upset. Cross-reactivity with other beta-lactams.

Species-specific contraindications and adverse-reaction reports for chickens may differ from canine / feline reference data — consult the primary citations listed with each rule.

Frequently asked questions

What is the dose of Amoxicillin for Chickens?

Amoxicillin dose range in chickens, with cited source references: PO 15 mg/kg q24h x 3 days. Reference ranges from cited sources — verify against current literature before clinical use.

How is Amoxicillin administered in Chickens?

Documented routes for Amoxicillin in chickens: PO.

What conditions does Amoxicillin treat in Chickens?

Amoxicillin is indicated in chickens for: Bacterial infection.

What are the side effects of Amoxicillin in Chickens?

These are general warnings for Amoxicillin across species; consult the chicken dosing table above for species-specific guidance. CONTRAINDICATED in rabbits, guinea pigs, and hamsters (fatal dysbiosis). May cause GI upset. Cross-reactivity with other beta-lactams.

Other Antibiotic drugs with chicken dosing

Amikacin Amoxicillin-Clavulanate Ampicillin Avilamycin Bacitracin (Livestock Feed)Bambermycin Chlortetracycline Doxycycline Enramycin Enrofloxacin Erythromycin Florfenicol

Amoxicillin dosing in other species

Cattle Swine Turkeys African Grey Parrots African Pygmy Hedgehogs Ball Pythons Bearded Dragons Blue-tongue Skinks

See all species for Amoxicillin See all drugs for Chickens

Why a species-specific page? Amoxicillin pharmacokinetics differ across species: dose ranges, intervals, and route preferences are not interchangeable. Cross-extrapolation from canine doses is unsafe in chickens — the rules above are the citations specific to this species, not generic recommendations.

Sourced from published veterinary references; awaiting credentialed clinical reviewer. See our editorial process. Reference only — not veterinary advice.