Niclofolan (bayer 9015, Bilevon) is a biphenyl anthelmintic compound. Niclofolan is used orally towards the treatment of Fasciola hepatica infection. Niclofolan therapy achieved elimination of eggs from the feces and normalization of eosinophil counts, liver enzymes and Fasciola titers, suggesting eradication of biliary flukes. Niclofolan has also been used in the treatment of Paragonimus westermani in dogs and cats and P. iloktsuenensis in rats. It was proved that administration of daily dose of 1.0 mg/kg body weight for 3 days or in 2 doses of 2.0 mg/kg body weight by alternate days were evidently effective for the infected dogs, cats and rats with the lung flukes, and toxic manifestations were not found.