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Active ingredient

Fenbendazole

Fenbendazole is a veterinary antiparasitic medicine belonging to the benzimidazole class. It is used in animals — including dogs, cats, horses, livestock and other species — to treat infections caused by gastrointestinal worms and certain other parasites. It is a veterinary product and is not an approved medicine for use in humans; it should be used only in animals, for its intended antiparasitic purpose, under the guidance of a veterinary surgeon.

Reviewed by the Kam4eu Pharmacy Team on 21 June 2026 · Next review June 2027

Fenbendazole medicines we deliver

Browse the full Antibiotics range

4 generic Fenbendazole products — same molecule, different brands, formats and pack sizes.

How it works

Fenbendazole works by interfering with the internal cell structures of parasitic worms. Benzimidazoles bind to a protein called tubulin, which the parasite needs to form microtubules — structures essential for transporting nutrients and maintaining the cell. By disrupting this process, the medicine starves and ultimately kills the parasite. It acts on worm cell structures, which differ from those of the host animal.

How it is taken

Fenbendazole is a veterinary medicine and should be given to animals only, exactly as directed by a veterinary surgeon and according to the product label for the species being treated. It is available in forms such as oral granules, pastes and liquids, and the appropriate product, course length and schedule depend on the animal and the parasite involved. Do not use it in humans.

Side effects

Common (usually mild and temporary):

  • Mild gastrointestinal upset in the treated animal, such as vomiting or soft stools
  • Reduced appetite
  • Drooling or salivation shortly after dosing
  • Mild lethargy
  • Loose droppings as parasites are cleared

Stop and seek medical help if you experience:

  • Signs of an allergic reaction in the animal, such as facial swelling, hives or breathing difficulty — contact a vet urgently
  • Persistent vomiting, severe or bloody diarrhoea, or marked weakness
  • Collapse or other sudden, severe illness after dosing — seek emergency veterinary care
  • Accidental ingestion by a person, especially a child — contact a doctor or poisons advice service

Safety & who should not take it

  • Fenbendazole is a veterinary antiparasitic and is not approved for human use; it should be used only in animals and only for treating parasites.
  • Always follow the dosing and species instructions provided by a veterinary surgeon and on the product label, as products and strengths differ between animals.
  • Tell your vet about your animal's age, weight, health conditions, pregnancy status and any other treatments before giving fenbendazole.
  • Wash your hands after handling the product and avoid contact with your eyes and mouth.
  • Keep the product out of the reach of children and pets except when dosing the intended animal under guidance.
  • Do not use the product for unproven purposes; use it only as an antiparasitic in animals as directed by a vet.
  • Dispose of unused product and packaging responsibly, following the label and local guidance for veterinary medicines.

Storage

Store the veterinary product in its original packaging at the temperature stated on the label, away from heat, light and moisture, out of the reach of children and animals. Keep containers tightly closed. Do not use after the expiry date.

Frequently asked questions

Is fenbendazole a human medicine?+

No. Fenbendazole is a veterinary antiparasitic. It is not approved for human use and should be used only in animals, for treating parasites, under the guidance of a veterinary surgeon.

Which animals is it used in?+

It is used in a range of species, including dogs, cats, horses and livestock, to treat gastrointestinal worms and certain other parasites. The correct product and dosing depend on the animal, so follow your vet's advice.

What should I do if a person swallows it?+

If a person, particularly a child, accidentally swallows the product, contact a doctor or a poisons advice service for guidance and keep the packaging to hand.

Important: This information is general and not a substitute for medical advice. Always read the patient information leaflet supplied with your medicine and consult a doctor or pharmacist before use — especially if you have existing health conditions or take other medication.