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Ivermectin Paste Horse Wormer (1.87% Ivermectin) controls bots, large strongyles, small bloodworms, ascarids (roundworms), threadworms, pinworms, hairworms, lungworms, and large mouth stomach worms. Ivermectin wormer is proven safe for horses of all ages, including pregnant mares, breeding stallions, and foals of any age. Each syringe will treat up to 1250 lbs. body weight. Syringes are adjustable in 250 lb. increments. Apple flavored.