Zimecterin worming paste for horses (1.87% Ivermectin) is the original patented formula of ivermectin paste that provides parasite control for 60 species and stages of parasites in horses, nearly twice as many as claimed by generic equivalents. This combination of anthelmintic and boticide horse wormer is effective against bots, large strongyles, small bloodworms, ascarids, bots, threadworms, pinworms, hairworms, lungworms, and largemouth stomach worms. The ivermectin paste for horses is proven safe for pregnant mares, breeding stallions, and any age foal. Each syringe treats 1,250 lbs. of body weight. Syringes are adjustable in 250 lb. increments.