Ampicillin for Bearded Dragons

Reptile · Pogona vitticeps · typical adult weight 0.38–0.51 kg

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.

Ampicillin is dosed at 10–20 mg/kg SC, IM q12h in bearded dragons, per 184. Hedley J. BSAVA Small Animal Formulary: Exotic Pets, British Small Animal Veterinary Association, Quedgeley, UK; 2020. / 243. Klaphake E, Gibbons PM, Sladky KK, et al. Reptiles. In: Carpenter JW, eds. Exotic Animal Formulary, 5th ed., Elsevier, St. Louis, MO; 2018:81-166. — Source: Carpenter's Exotic Animal Formulary, 6th Ed, p.212 — Carpenter's Exotic Animal Formulary 6th ed, Table 4.1 (Antimicrobial Agents Used in Reptiles.a,b). Ampicillin is used in bearded dragons for Bacterial infection (may be used with an aminoglycoside). Routes documented in bearded dragons: SC, IM. A typical adult bearded dragon weighs 0.38–0.51 kg. ExoticRx lists 1 cited dose rule for Ampicillin in bearded dragons, drawn from published veterinary references. Verify against current literature before clinical use.

US trade names: Polyflex

Dose ranges

Route	Dose	Frequency	Indication	Evidence	Source
SC, IM	10–20 mg/kg	q12h	Bacterial infection (may be used with an aminoglycoside)	Weak	184. Hedley J. BSAVA Small Animal Formulary: Exotic Pets, British Small Animal Veterinary Association, Quedgeley, UK; 2020. / 243. Klaphake E, Gibbons PM, Sladky KK, et al. Reptiles. In: Carpenter JW, eds. Exotic Animal Formulary, 5th ed., Elsevier, St. Louis, MO; 2018:81-166. — Source: Carpenter's Exotic Animal Formulary, 6th Ed, p.212 — Carpenter's Exotic Animal Formulary 6th ed, Table 4.1 (Antimicrobial Agents Used in Reptiles.a,b).Compilation only — we have not located an independent source that prints this figure.

What each reference text prints

Every held source for this drug and species, as printed. Where they differ, both are shown — the choice is yours, not ours.

Printed doses in mg/kg for this drug and species, by source
Dose (mg/kg)	Route	Source	As printed
10–20	SC	BSAVA Small Animal Formulary, 10th ed — Part B (Exotic Pets)p.23	10-20 mg/kg s.c., i.m. q12-24h (most species); Hermann’s tortoises: 50 mg/kg i.m. q12h
50	IM	BSAVA Small Animal Formulary, 10th ed — Part B (Exotic Pets)p.23	/kg s.c., i.m. q12-24h (most species); Hermann’s tortoises: 50 mg/kg i.m. q12h
10–20	SC	Carpenter's Exotic Animal Formulary, 6th edTable 4.1	10-20 mg/kg SC, IM q12h,243
10–20	SC	Mader's Reptile and Amphibian Medicine and Surgery, 3rd edTable 127.1	10-20 mg/kg SC, IM q12h148 Most species, including chameleons

Figures are transcribed from the cited page or table of each held edition and are shown for reference only. They are not dose recommendations, they do not feed the calculator, and none has been reviewed by a veterinarian.

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Calculate the dose for your bearded dragon

3 a day (1 exotic) · no account needed

Drug

Ampicillin (Polyflex)

Weight

Typical range: 380–510 g

Route

Concentration (optional, mg/ml)

If provided, volume will be calculated alongside dose.

Reference only. Verify against current literature before clinical use.

Mechanism of action

Inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins. Broader spectrum than penicillin G with gram-negative coverage.

Side effects & warnings

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

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

Frequently asked questions

What is the dose of Ampicillin for Bearded Dragons?

Ampicillin dose range in bearded dragons, with cited source references: SC, IM 10–20 mg/kg q12h. Reference ranges from cited sources — verify against current literature before clinical use.

How is Ampicillin administered in Bearded Dragons?

Documented routes for Ampicillin in bearded dragons: SC, IM.

What conditions does Ampicillin treat in Bearded Dragons?

Ampicillin is indicated in bearded dragons for: Bacterial infection (may be used with an aminoglycoside).

What are the side effects of Ampicillin in Bearded Dragons?

These are general warnings for Ampicillin across species; consult the bearded dragon 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. IM injection may be painful.

Other Antibiotic drugs with bearded dragon dosing

Amoxicillin Cefotaxime Ceftazidime Ceftiofur Chloramphenicol Ciprofloxacin Doxycycline Enrofloxacin Enrofloxacin Injectable Metronidazole Oxytetracycline Sulfadiazine

Ampicillin dosing in other species

Ball Pythons Blue-tongue Skinks Corn Snakes Crested Geckos Eastern Box Turtles Red-eared Sliders Russian Tortoises Sulcata Tortoises

See all species for Ampicillin See all drugs for Bearded Dragons

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