Cat · Felis catus · typical adult weight 2.50–7.00 kg
Fenbendazole is dosed at 50 mg/kg PO q24h for 5 to 7 days in cats, per PANACUR - Small Animal 10% Oral Suspension [UK Product Label for Dogs and Cats]. MSD Animal Health; 2021. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=859d4e30-d70c-4baf-aa62-0d3feff25057 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.533 (2026-08-01). — Plumb's 10th ed (held) printed p.506, Fenbendazole monograph spanning p.505-507; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207. Fenbendazole is used in cats for Giardia, Roundworms and hookworms in kittens under 6 months - lungworm (Aelurostrongylus abstrusus) at any age, Aelurostrongylus (lungworm). Routes documented in cats: PO. A typical adult cat weighs 2.50–7.00 kg. ExoticRx lists 3 cited dose rules for Fenbendazole in cats, drawn from published veterinary references. Verify against current literature before clinical use.
US trade names: Panacur
| Route | Dose | Frequency | Duration | Indication | Evidence | Source |
|---|---|---|---|---|---|---|
| PO | 50 mg/kg | q24h for 5 to 7 days | 5 consecutive days | Giardia | Strong | PANACUR - Small Animal 10% Oral Suspension [UK Product Label for Dogs and Cats]. MSD Animal Health; 2021. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=859d4e30-d70c-4baf-aa62-0d3feff25057 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.533 (2026-08-01). — Plumb's 10th ed (held) printed p.506, Fenbendazole monograph spanning p.505-507; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207 |
| PO | 50 mg/kg | q24h for 3 days | 3-5 consecutive days | Roundworms and hookworms in kittens under 6 months - lungworm (Aelurostrongylus abstrusus) at any age | Strong | Gruffydd-Jones T, Addie D, Belak S, et al. Giardiasis in cats: ABCD guidelines on prevention and management. J Feline Med Surg. 2013;15(7):650-652. PMID: 23813834 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.533 (2026-08-01). — Plumb's 10th ed (held) printed p.506, Fenbendazole monograph spanning p.505-507; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207 |
| PO | 50 mg/kg | q24h | 10-14 days for lungworm | Aelurostrongylus (lungworm) | Moderate | PANACUR - Small Animal 10% Oral Suspension [UK Product Label for Dogs and Cats]. MSD Animal Health; 2021. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=859d4e30-d70c-4baf-aa62-0d3feff25057 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.533 (2026-08-01). — Plumb's 10th ed (held) printed p.506, Fenbendazole monograph spanning p.505-507; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207 |
Every held source for this drug and species, as printed. Where they differ, both are shown — the choice is yours, not ours.
The sources disagree for this combination. The ranges below do not overlap on a comparable route. This is not an error in one of them — published veterinary references differ, and reconciling them for a particular patient is a clinical judgement.
| Dose (mg/kg) | Route | Source | As printed |
|---|---|---|---|
| 20 | PO | BSAVA Small Animal Formulary, 10th ed — Part A (Canine and Feline)p.176 | • Roundworms, tapeworms: cats <6 months old: 20 mg/kg p.o. q24h for 5 days; >6 months old: 100 mg/kg as a single dose p.o. |
| 100 | PO | BSAVA Small Animal Formulary, 10th ed — Part A (Canine and Feline)p.176 | d: 20 mg/kg p.o. q24h for 5 days; >6 months old: 100 mg/kg as a single dose p.o. |
| 50 | PO | Papich Saunders Handbook of Veterinary Drugs, 4th edp.344 | • 50 mg/kg/day for 3 days PO. |
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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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 cats may differ from canine / feline reference data — consult the primary citations listed with each rule.
Fenbendazole dose ranges in cats, with cited source references: PO 50 mg/kg q24h for 5 to 7 days; PO 50 mg/kg q24h for 3 days; PO 50 mg/kg q24h. Reference ranges from cited sources — verify against current literature before clinical use.
Documented routes for Fenbendazole in cats: PO.
Cited course lengths for Fenbendazole in cats include: 5 consecutive days; 3-5 consecutive days; 10-14 days for lungworm. Duration depends on the indication — match it to the specific dose rule in the table above.
Fenbendazole is indicated in cats for: Giardia, Roundworms and hookworms in kittens under 6 months - lungworm (Aelurostrongylus abstrusus) at any age, Aelurostrongylus (lungworm).
These are general warnings for Fenbendazole across species; consult the cat 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 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.