Nitroxynil (4-hydroxy-3-iodo-5-nitrobenzenonitrile), 25%
solution, is an anthelmintic veterinary drug widely used in pro-
phylaxis and treatment of hepatic distomatosis, and fascioliasis
(infestations of mature and immature fasciola hepatica) in cattle
and sheep. It is also effective, at the recommended dose rate,
against adult and larval infestations of