For the treatment and control of the following parasites of horses and donkeys:Large strongyles: adults and arterial larval stages of strongylus vulgaris, adults and tissue larval stages of s. edentatus, adults of s. equinus and triodontophorus spp. Adult and immature small stronyles influding benzimidazole resistant strains: Cyathostomum spp, Cylicocyclus spp, Cyclicodontophorus spp, Gyalocephalus spp. Adult and immature lungworms: Dictyocaulus arnfieldi. Adult and immature oxxyuris equi. Adult and immature parascaris equorum. Adult trichostrongylus axei, Habronema muscae and stronyloides westeri.Microfilariae of onchocerca spp. Oral and gastric stages of bots: Gastrophilus spp.