Duramectin Ivermectin Paste 1.87% for Horses, 0.21 oz Made in USA Kills important internal parasites including bots and the arterial stages of S vulgaris with a single dose Safe to use in horses of all ages including mares at any stage of pregnancy Stallions may be treated without adversely affecting their fertility Provides the broadest spectrum parasite control available Kills 35 species and stages combined