Fish · Carassius auratus · typical adult weight 0.01–3.00 kg
Fenbendazole is dosed at 20 mg/kg/day PO (medicated feed) once daily for 3 consecutive days in goldfishes, per Dong J, Li J, Liu Y, Yang Q, Xu N, Ai X, Zhou S. Preclinical Evaluation of Fenbendazole for Controlling Gyrodactylus kobayashii (Monogenea, Gyrodactylidae) in Goldfish: Dose Optimization and Safety Assessment. Animals (Basel). 2025;15(12):1811. doi:10.3390/ani15121811 https://pmc.ncbi.nlm.nih.gov/articles/PMC12189257/. Fenbendazole is used in goldfishes for Monogenean ectoparasites (Gyrodactylus). Routes documented in goldfishes: PO (medicated feed). A typical adult goldfish weighs 0.01–3.00 kg. ExoticRx lists 1 cited dose rule for Fenbendazole in goldfishes, drawn from published veterinary references. Verify against current literature before clinical use.
US trade names: Panacur
| Route | Dose | Frequency | Indication | Evidence | Source |
|---|---|---|---|---|---|
| PO (medicated feed) | 20 mg/kg/day | once daily for 3 consecutive days | Monogenean ectoparasites (Gyrodactylus) | Moderate | Dong J, Li J, Liu Y, Yang Q, Xu N, Ai X, Zhou S. Preclinical Evaluation of Fenbendazole for Controlling Gyrodactylus kobayashii (Monogenea, Gyrodactylidae) in Goldfish: Dose Optimization and Safety Assessment. Animals (Basel). 2025;15(12):1811. doi:10.3390/ani15121811 https://pmc.ncbi.nlm.nih.gov/articles/PMC12189257/ |
Every held source for this drug and species, as printed. Where they differ, both are shown — the choice is yours, not ours.
| Dose (% feed) | Route | Source | As printed |
|---|---|---|---|
| 0.2 | IN | Carpenter's Exotic Animal Formulary, 6th edTable 2.2 | 40 mg/kg PO via feed q4d × 2 treatments 50 mg/kg PO q24h × 2 days, repeat in 14 days 2.5 mg/g of feed × 2-3 days, repeat in 14 days 0.2% of feed × 3 days, repeat in 14-21 days |
| Dose (mg/kg) | Route | Source | As printed |
|---|---|---|---|
| 40 | PO | Carpenter's Exotic Animal Formulary, 6th edTable 2.2 | 40 mg/kg PO via feed q4d × 2 treatments 50 mg/kg PO q24h × 2 days, repeat in 14 days 2.5 mg/g of feed × 2-3 days, repeat in 14 days 0.2% of feed × 3 days, repeat in 14-21 days |
| 50 | PO | Carpenter's Exotic Animal Formulary, 6th edTable 2.2 |
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These ranges are per kg. Enter your goldfish's weight to get the precise dose and draw-up volume — unit and concentration math done for you.
Binds to beta-tubulin, inhibiting microtubule polymerization in parasites. Disrupts energy metabolism and cell division.
Very wide safety margin. Rarely causes vomiting or diarrhea. Safe in pregnant animals at standard doses. Must be given for multiple consecutive days for efficacy.
Species-specific contraindications and adverse-reaction reports for goldfishes may differ from canine / feline reference data — consult the primary citations listed with each rule.
Fenbendazole dose range in goldfishes, with cited source references: PO (medicated feed) 20 mg/kg/day once daily for 3 consecutive days. Reference ranges from cited sources — verify against current literature before clinical use.
Documented routes for Fenbendazole in goldfishes: PO (medicated feed).
Fenbendazole is indicated in goldfishes for: Monogenean ectoparasites (Gyrodactylus).
These are general warnings for Fenbendazole across species; consult the goldfish dosing table above for species-specific guidance. Very wide safety margin. Rarely causes vomiting or diarrhea. Safe in pregnant animals at standard doses. Must be given for multiple consecutive days for efficacy.
Why a species-specific page? Fenbendazole pharmacokinetics differ across species: dose ranges, intervals, and route preferences are not interchangeable. Cross-extrapolation from canine doses is unsafe in goldfishes — 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.
| 40 mg/kg PO via feed q4d × 2 treatments 50 mg/kg PO q24h × 2 days, repeat in 14 days 2.5 mg/g of feed × 2-3 days, repeat in 14 days 0.2% of feed × 3 days, repeat in 14-21 days |
| Dose (mg/l) | Route | Source | As printed |
|---|---|---|---|
| 2 | IMMERSION | Carpenter's Exotic Animal Formulary, 6th edTable 2.2 | 2 mg/L bath q7d × 3 treatments |
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.