Piperacillin-Tazobactam for Cats

Cat · Felis catus · typical adult weight 2.50–7.00 kg

Piperacillin-Tazobactam is dosed at 40–50 mg/kg IV q6h (infuse over 30 minutes) in cats, per Plumb's Veterinary Drug Handbook, 9th ed, printed p.1030 (corpus PDF p.1057) - Piperacillin/Tazobactam, Dosages, DOGS/CATS: '40 - 50 mg/kg IV over 30 minutes every 6 hours have been suggested.' Concordant: Papich MG, Saunders Handbook of Veterinary Drugs, 4th ed, printed p.641 (PDF p.669), Small Animal Dosage, Dogs and Cats: '50 mg/kg q6h IV or IM.'. Piperacillin-Tazobactam is used in cats for Severe mixed infections. Routes documented in cats: IV. A typical adult cat weighs 2.50–7.00 kg. ExoticRx lists 1 cited dose rule for Piperacillin-Tazobactam in cats, drawn from published veterinary references. Verify against current literature before clinical use.

US trade names: Zosyn

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	40–50 mg/kg	q6h (infuse over 30 minutes)	7-14 days	Severe mixed infections	Weak	Plumb's Veterinary Drug Handbook, 9th ed, printed p.1030 (corpus PDF p.1057) - Piperacillin/Tazobactam, Dosages, DOGS/CATS: '40 - 50 mg/kg IV over 30 minutes every 6 hours have been suggested.' Concordant: Papich MG, Saunders Handbook of Veterinary Drugs, 4th ed, printed p.641 (PDF p.669), Small Animal Dosage, Dogs and Cats: '50 mg/kg q6h IV or IM.'

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Mechanism of action

Piperacillin inhibits cell wall synthesis; tazobactam inhibits many beta-lactamases restoring activity against resistant organisms.

Side effects & warnings

Adjust dose for renal impairment. Monitor bleeding (platelet dysfunction). GI upset. Sodium content may be significant in fluid-restricted patients.

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

Frequently asked questions

What is the dose of Piperacillin-Tazobactam for Cats?

Piperacillin-Tazobactam dose range in cats, with cited source references: IV 40–50 mg/kg q6h (infuse over 30 minutes). Reference ranges from cited sources — verify against current literature before clinical use.

How is Piperacillin-Tazobactam administered in Cats?

Documented routes for Piperacillin-Tazobactam in cats: IV.

How long is Piperacillin-Tazobactam given in Cats?

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

What conditions does Piperacillin-Tazobactam treat in Cats?

Piperacillin-Tazobactam is indicated in cats for: Severe mixed infections.

What are the side effects of Piperacillin-Tazobactam in Cats?

These are general warnings for Piperacillin-Tazobactam across species; consult the cat dosing table above for species-specific guidance. Adjust dose for renal impairment. Monitor bleeding (platelet dysfunction). GI upset. Sodium content may be significant in fluid-restricted patients.

Other Antibiotic drugs with cat dosing

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

Piperacillin-Tazobactam dosing in other species

Dogs

See all species for Piperacillin-Tazobactam See all drugs for Cats

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