Ivermectin 1.87%) A potent antiparasitic agent that is neither a benzimidazole nor an organophosphate. Broad-spectrum control: kills important parasites, including bots and the arterial stages of S. vulgaris, with a single dose. Provides effective treatment and control of the following parasites from horses:large Strongyles (adults), small strongyles (adults, including those resistant to some benzimidazole class compounds), small strongyles- fourth-stage larvae, pinworms, ascarids (adults and third-and-fourth-stage larvae), hairworms (adults), large-mouth stomach worms (adults), bots (oral and gastric stages), lungworms (adults and fourth-stage larvae), intestinal threadworms (adults), summer sores caused by habronema and draschia spp. cutaneous third-stage larvae, dermatitis caused by neck threadworm microfilariae. May be used in horses of all ages, including mares at any stage of pregnancy . Stallions may be treated without adversely affecting their fertility.