From Cow

Fenbendazole is a benzimidazole anthelmintic manufactured for use in control of intestinal parasites in cattle including roundworms, Giardia spp and Tritrichomonas spp[1].

After oral administration, only half of the dose is eliminated after 6 days, indicating a fairly high degree of sequestration, probably within the gastrointestinal tract[2][3].

Fenbendazole is effective against nematodes (roundworms, hookworms and whipworms), cestodes but not trematodes.

Recommended dose rate is 25 - 50 mg/kg bodyweight.


  1. Geurden T et al (2010) The effect of a fenbendazole treatment on cyst excretion and weight gain in calves experimentally infected with Giardia duodenalis. Vet Parasitol 169(1-2):18-23
  2. Short CR et al (1987) Disposition of fenbendazole in cattle. Am J Vet Res 48(6):958-961
  3. Rendell DK (2010) Anthelmintic resistance in cattle nematodes on 13 south-west Victorian properties. Aust Vet J 88(12):504-509