Fenbendazole is a broad-spectrum benzimidazole anthelmintic, used for treatment of gastrointestnal nematodes in poultry.
Fenbendazole comes available as an oral suspension (10% - 100 mg/mL).
Fenbendazole shouldn't be given to birds actively growing new feathers, such as those in the early stages of growth or during molting.
- In waterfowl: 5-15 mg/kg, given orally once a day for 5 days.
- In laying hens producing eggs intended for human consumption: 1 mg/kg (0.45 mg/lb) given orally, for 5 days with a 0-day egg withdrawal. FARAD recommends an egg withdrawal interval of 17 days for hens.
- In other poultry species, for ascarids: 20-50 mg/kg given once orally and repeated in 10 days.
- In other poultry species, for flukes: 20-50 mg/kg given orally once a day for 3 days.
- In other poultry species, for capillaria: 20-50 mg/kg given orally once a day for 5 days.