Rabbit Drug Dosing: A Vet's Quick Reference

Last reviewedApril 29, 2026Reading time5 minExoticRx Editorial

Editorially reviewed against primary literature. Awaiting credentialed clinical reviewer — our editorial process.

Domestic rabbits (Oryctolagus cuniculus) are the third most popular companion mammal in many Western markets, and the literature on rabbit pharmacology has matured substantially over the last fifteen years. The trap for general practitioners is that rabbits look enough like cats — small, furry, easily handled — that drugs are sometimes reached for on a "small carnivore" mental model. They are not small carnivores. They are obligate hindgut fermenters, and several of the most familiar oral antibiotics in dog and cat practice will reliably kill them.

ExoticRx surfaces 254 active dose rules for rabbits across analgesics, antibiotics, antiparasitics, anesthetics, and gastrointestinal-support drugs. Browse the full rabbit formulary for the live, source-cited data.

The single most important rule: oral antibiotic selection

The rabbit hindgut depends on a delicate balance of Bacteroides spp. and other commensal anaerobes. When a narrow-spectrum oral antibiotic preferentially kills the gram-positive flora, the pathogenic Clostridium spiroforme (and related Clostridium spp.) explodes, producing iota-toxin and causing fatal enterotoxemia within days.

The classic teaching list of oral antibiotics that should never be administered to rabbits orally:

• Penicillins (oral amoxicillin, ampicillin)
• Cephalexin and other oral first-generation cephalosporins
• Clindamycin and lincomycin (oral)
• Erythromycin (oral)

Note that injectable penicillin G is used in some rabbit protocols (intramuscular procaine penicillin for treponematosis, for example) — it is the oral route that drives dysbiosis. When in doubt, never administer a beta-lactam orally to a rabbit.

The safe oral options for routine bacterial infections are well-established:

• Trimethoprim-Sulfamethoxazole — broad-spectrum, generally well-tolerated PO.
• Enrofloxacin and Marbofloxacin — fluoroquinolones; first-line for many gram-negative infections including pasteurellosis.
• Doxycycline — useful for Pasteurella and intracellular pathogens.
• Chloramphenicol — historically heavily used for upper respiratory disease; reserve for culture-guided indications.
• Metronidazole — used for protozoal disease, anaerobic infections, and as an adjunct in dysbiosis.
• Azithromycin — useful when intracellular coverage is needed.

For systemic injectable use, the cephalosporin family (e.g. Ceftiofur, Cefotaxime, Ceftazidime) is widely used and considered safe by the parenteral route in rabbits. Amikacin is reserved for serious gram-negative or multidrug-resistant infections; nephrotoxicity warrants pre-treatment hydration and ideally serum-level monitoring.

Analgesia: rabbits feel pain, and prey-species behaviour conceals it

Rabbits are prey animals. A painful rabbit hides; an extremely painful rabbit looks "settled" to an inexperienced observer. Use a validated grimace scale (e.g. Rabbit Grimace Scale, Keating et al.) rather than relying on overt behavioural signs. The drugs in routine use:

• Meloxicam — a workhorse NSAID. Rabbit-specific PK supports higher per-kg dosing than the mammalian standard, and clinical experience strongly supports its use in osteoarthritis, dental pain, and post-operative analgesia. Always assess hydration and renal status before starting a course.
• Buprenorphine — partial mu-agonist; widely used post-operatively. Onset is slower than in dogs/cats; pre-emptive dosing is important.
• Butorphanol — kappa-agonist; useful for milder visceral pain or combined with sedatives, but generally insufficient as standalone analgesia for surgical pain.
• Tramadol — clinical evidence in rabbits is mixed; consider as adjunct rather than primary analgesic.
• Gabapentin — increasingly used for chronic / neuropathic pain.

Anesthesia

Rabbits are higher-risk anesthetic patients than cats and dogs, partly because of their fragile bronchi (intubation can be technically demanding) and partly because of catecholamine-mediated cardiac complications under stress. Pre-anesthetic anxiolysis matters more than in any small mammal you will commonly encounter.

• Isoflurane — standard volatile agent. Mask induction is acceptable in stressed patients but breath-holding is well-documented; consider pre-medication to reduce induction time and stress.
• Propofol — IV induction; smooth, but apnea is common, so be prepared to ventilate.
• Atipamezole — alpha-2 reversal; equal-volume to medetomidine / dexmedetomidine.

Antiparasitic dosing

Rabbit-specific parasites worth knowing:

• Encephalitozoon cuniculus — a microsporidian responsible for vestibular signs, posterior paresis, renal disease, and uveitis. Fenbendazole is the standard treatment, typically a 28-day course PO. Long courses warrant CBC monitoring.
• Psoroptes cuniculi (ear mites) and Cheyletiella — Ivermectin is widely used. Note that ivermectin is not safe in chelonians, but rabbits tolerate it well at standard rabbit doses.
• GI parasites — Praziquantel for cestodes; benzimidazoles for nematodes.

Gastrointestinal support: where rabbit medicine actually wins or loses

Most rabbit emergencies that present to general practice are some flavour of gastrointestinal stasis ("ileus") secondary to pain, dehydration, dental disease, or insufficient long-stem fibre. The supportive drugs matter more than any antibiotic:

• Metoclopramide — prokinetic; useful adjunct, though physical mechanical obstruction must be ruled out before dosing.
• Cisapride — prokinetic; access varies by jurisdiction.
• Simethicone — for gas relief in tympanitic GI stasis cases.
• Aggressive fluid therapy — subcutaneous or intravenous, depending on severity. Often the single most useful intervention.
• Gabapentin or other analgesia — pain itself drives ileus, so failing to address it perpetuates the problem.

A rabbit eating again is a rabbit recovering. Track caecotroph production and overall faecal output; force-feeding (Critical Care or equivalent) is often appropriate within 12 hours of presentation.

Common dosing mistakes

1. Reaching for the same antibiotic you'd use in a kitten. See above. Oral amoxicillin in particular is a recurring fatal error in mixed practice.
2. Under-dosing meloxicam. Rabbit doses are substantially higher per kg than canine doses on a published-PK basis. Insufficient analgesia after spay/neuter is a well-documented cause of post-operative GI stasis.
3. Skipping pre-anesthetic anxiolysis. A stressed rabbit on the induction mask is a high-risk rabbit.
4. Treating GI stasis as a primary diagnosis. It almost always isn't. Look for the root cause — dental disease, pain, lower urinary disease, foreign body — and treat that alongside supportive care.

Sources

• Carpenter's Exotic Animal Formulary, current edition
• BSAVA Manual of Rabbit Medicine and Surgery
• Plumb's Veterinary Drug Handbook (rabbit entries)
• Peer-reviewed rabbit PK and clinical literature
• Encephalitozoon cuniculus consensus literature

For source-cited dose ranges, open any drug name above on ExoticRx — each entry carries an explicit evidence level and citation alongside the per-kg numbers.

Disclaimer

This article is an informational reference for licensed veterinary professionals, technicians, and students. It does not constitute veterinary medical advice and is not a substitute for clinical judgement, current peer-reviewed literature, or the recommendation of an attending clinician. See the full dosage disclaimer.