Control the following horse parasites: Large redworms: adult and arterial and 4-th larval ( arterial) stage of strongylus vulgaris adults and 4-th larval (tissue) stages of s. edentatus (adults) of s.eguinus. Small redworm: adult and developing immatures (4-th stage larval) of the following species of small stronyles or cyathostomes: Triodontophorus spp. (adults) Coroncyclus spp. Cyathostomum spp. Cylococyclus spp. Cylicostephanus spp. Poteriostomum spp. (ivermectin is not effictive against encysted larval stages of the small strongyles.) Pinworms: adult and immature Oxyuris equi. Lungworms: adult and immature dictyocaulus arnfieldi. Ascarids: adult and immature parascaris equorum. Stomach worms: Trichostrongylus axei and habronema muscae. Intestinal threadworms: Strongyloides westeri. Cutaneous worms: microfilariae of onchocerca spp. Bots: mouth and stomach stages of Gasterophilus spp.