Oxacillin for Dogs

Dog · Canis lupus familiaris · typical adult weight 2.00–80.00 kg

Oxacillin is dosed at 22–40 mg/kg IV q8h in dogs, per Plumb's Veterinary Drug Handbook, 9th ed, printed p.964 (corpus pdf p.991), Oxacillin, DOGS/CATS: 'Susceptible infections (extra-label): 22 - 40 mg/kg SC, IM, or IV every 8 hours'. Corroborated by Papich, Saunders Handbook of Veterinary Drugs, 5th ed, printed p.586 (corpus pdf p.614), Oxacillin, Dogs and Cats: '22-40 mg/kg q8h PO.'. Oxacillin is used in dogs for Staphylococcal infections. Routes documented in dogs: IV. A typical adult dog weighs 2.00–80.00 kg. ExoticRx lists 1 cited dose rule for Oxacillin in dogs, drawn from published veterinary references. Verify against current literature before clinical use.

US trade names: Bactocill

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	Duration	Indication	Evidence	Source
IV	22–40 mg/kg	q8h	7-14 days	Staphylococcal infections	Moderate	Plumb's Veterinary Drug Handbook, 9th ed, printed p.964 (corpus pdf p.991), Oxacillin, DOGS/CATS: 'Susceptible infections (extra-label): 22 - 40 mg/kg SC, IM, or IV every 8 hours'. Corroborated by Papich, Saunders Handbook of Veterinary Drugs, 5th ed, printed p.586 (corpus pdf p.614), Oxacillin, Dogs and Cats: '22-40 mg/kg q8h PO.'

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Mechanism of action

Penicillinase-resistant penicillin. Resists staphylococcal beta-lactamase. Narrow spectrum targeting methicillin-susceptible staphylococci.

Side effects & warnings

Parenteral administration only. Interstitial nephritis possible. Not effective against MRSA. Hepatotoxicity rare.

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

Frequently asked questions

What is the dose of Oxacillin for Dogs?

Oxacillin dose range in dogs, with cited source references: IV 22–40 mg/kg q8h. Reference ranges from cited sources — verify against current literature before clinical use.

How is Oxacillin administered in Dogs?

Documented routes for Oxacillin in dogs: IV.

How long is Oxacillin given in Dogs?

Cited course lengths for Oxacillin in dogs include: 7-14 days. Duration depends on the indication — match it to the specific dose rule in the table above.

What conditions does Oxacillin treat in Dogs?

Oxacillin is indicated in dogs for: Staphylococcal infections.

What are the side effects of Oxacillin in Dogs?

These are general warnings for Oxacillin across species; consult the dog dosing table above for species-specific guidance. Parenteral administration only. Interstitial nephritis possible. Not effective against MRSA. Hepatotoxicity rare.

Other Antibiotic drugs with dog dosing

Amikacin Amoxicillin Amoxicillin-Clavulanate Ampicillin Azithromycin Aztreonam Bacitracin Carbenicillin Cefaclor Cefadroxil Cefazolin Cefdinir

See all species for Oxacillin See all drugs for Dogs

Why a species-specific page? Oxacillin pharmacokinetics differ across species: dose ranges, intervals, and route preferences are not interchangeable. Cross-extrapolation from canine doses is unsafe in dogs — 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.