Flubendazole is a broad spectrum anthelmintic for oral administration, active against mature and immature stages of the following nematodes of the gastro–intestinal and respiratory tract of the pig: Ascaris suum (large roundworm), Hyostrongylus rubidus (red stomach worm), Oesophagostomum dentatum (nodular worm), Trichuris suis (whipworm), Metastrongylus apri (lungworm), Strongyloides ransomi (threadworm). Flubendazole is ovicidal.