Each bolus of Vetfen-B contains Fenbendazole 1.5 g

For Roundworms / Tapeworms
To be administered orally @ 5 mg Fenbendazole /kg body weight in all animals (except in dogs/cats) for roundworms infestation i.e. one bolus of 1.5 g for 300 kg body weight, or 150 mg for 30 kg body weight in dogs and cats, the basic dosage is 50 mg Fenbendazole / kg body weight to be given daily in divided doses for 3 days.