Fenbendazole Bolus

Fenbendazole bolus are indicated for the control of parasitic worms in cattle, sheep, goats and horses.

Roundworms (Ascarids): Toxocara canis, Toxascaris leonina, Ascaridia galli, Neoascaris vitulorum.
Hookworms: Ancylostoma caninum, Uncinaria stenocephala, Bunostomum phlebotomum.
Whipworms: Trichuris vulpis.
Tapeworms: Effective against Taenia species but not typically against the common flea-borne tapeworm (Dipylidium caninum).
Lungworms: Dictyocaulus viviparus (in cattle) and Dictyocaulus filaria (in sheep/goats), Aelurostrongylus abstrusus (in cats), and Filaroides spp..
Stomach Worms: Haemonchus spp., Ostertagia spp., Trichostrongylus spp..
Other Parasites (Extra-label use in small animals): Commonly used “off-label” to treat Giardia.

The bolus is administered orally using a specialized applicator or balling gun to ensure it is swallowed correctly.

Restraint: The animal should be properly restrained.
Insertion: The applicator is inserted into the front of the mouth and gently pushed over the back of the tongue.
Swallowing: The animal’s head is tilted upward, and the bolus is released once the animal begins to swallow, which allows for safe passage into the esophagus.
Confirmation: The animal should be observed briefly to confirm swallowing.

Cattle, Buffaloes, Goats, Sheep: Typically around 5 mg per kg of body weight as a single dose (1.5 gm bolus for a 300 kg animal).
Horses: Generally 7.5 mg per kg of body weight as a single dose.
Continuous-Release Bolus: Some formulations are continuous-release intraruminal devices administered once to provide control throughout the grazing season (up to 140 days) for cattle weighing between 100 kg and 300 kg.

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