Binds to parasite beta-tubulin, inhibiting microtubule polymerisation and glucose uptake, causing parasite death
At a glance
Class
Benzimidazole anthelmintic
Dosing
Roundworms, hookworms, whipworms
Duration: 3 consecutive days
Giardiasis
Duration: 3-5 days
Lungworm (Angiostrongylus)
Duration: 5-21 days
Roundworms, hookworms
Duration: 3-5 days
Giardiasis
Duration: 5 days
Educational reference only
This information is provided for educational purposes and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a qualified veterinarian before administering any medication to your pet.
Find a vet near you →Safety
Absolute contraindications — do not use
Adverse effects
Serious
Bone marrow suppression (rare, with prolonged high-dose use)
Hepatotoxicity (rare)
Faecal examination post-treatmentCBC for prolonged courses
Educational reference only
This information is provided for educational purposes and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a qualified veterinarian before administering any medication to your pet.
Find a vet near you →Interactions
No documented interactions.
FAQs
Frequently asked questions
›What is Fenbendazole?
Fenbendazole is a benzimidazole anthelmintic used in pets. Binds to parasite beta-tubulin, inhibiting microtubule polymerisation and glucose uptake, causing parasite death
›What is Fenbendazole used for in pets?
Fenbendazole is used in veterinary medicine for: Roundworms, hookworms, whipworms; Giardiasis; Lungworm (Angiostrongylus); Roundworms, hookworms.
›What is the Fenbendazole dose for dogs?
For dogs, Fenbendazole is typically dosed as follows — Roundworms, hookworms, whipworms: 50 mg/kg PO SID; Giardiasis: 50 mg/kg PO SID; Lungworm (Angiostrongylus): 25–50 mg/kg PO SID. Always consult your veterinarian for a dose tailored to your pet's weight, age, and condition.
›What is the Fenbendazole dose for cats?
For cats, Fenbendazole is typically dosed as follows — Roundworms, hookworms: 50 mg/kg PO SID; Giardiasis: 50 mg/kg PO SID. Always consult your veterinarian for a dose tailored to your pet's weight, age, and condition.
›What are the side effects of Fenbendazole?
Common: Mild vomiting, Soft stools. Serious (call your vet immediately): Bone marrow suppression (rare, with prolonged high-dose use), Hepatotoxicity (rare).
›Does Fenbendazole need a prescription?
Yes. Fenbendazole is a prescription medication and should only be administered under veterinary supervision.
›When should Fenbendazole not be used?
Do not use Fenbendazole if: Known benzimidazole hypersensitivity.
Educational reference only
This information is provided for educational purposes and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a qualified veterinarian before administering any medication to your pet.
Find a vet near you →References
CDSCO approvals (India) — 2
Fenbendazole
M/s Hoechst · Approved 1979-January
Anthelmetic inidcated to treat gastro-intestinal nematodes infections of live stocks.
Fenbendazole +oxyclozamide Suspension & Bolus
M/s Hoechst Marion Roussel Ltd · Approved 04.10.1999
Intreatment of roundworms, lungworms fluke in cattles and sheep only
Source: CDSCO Veterinary Drug Approval Registry (1969–2026)
References
The PetCare.AI drug reference is built from 13 authoritative sources cited across 580 drug monographs.
Textbooks & handbooks — 5
- Plumb's Veterinary Drug Handbook
- Withrow & MacEwen's Small Animal Clinical Oncology
- Merck Veterinary Manual
- NRC Nutrient Requirements of Dogs and Cats
- Veterinary Pharmacology and Therapeutics (Riviere & Papich)
Clinical guidelines & consensus — 4
- ASPCA Animal Poison Control Center Guidelines
- AAHA Diabetes Management Guidelines
- ASPCA Poison Control Guidelines
- RECOVER CPR Guidelines
Journals & peer-reviewed studies — 2
- EPIC Study (J Vet Intern Med 2016)
- JVIM FAT CAT Study
Regulatory & approvals — 1
- CDSCO Veterinary Drug Approval Registry (1969–2026)
Databases — 1
- Washington State University VCPL MDR1 Database