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Kills 35 species and stages of worms and bots combined. Kills all 3 stages of the two most common bot species. Use six times per year for broad spectrum parasite control. One syringe treats a 1,250 pound horse. Safe for mares at any stage of pregnancy. No need to rotate with another wormer. Use every other month. Active ingredient: 1.87% ivermectin. This item is not available in Canada
Active ingredient: 1.87% ivermectin.