AI: 0.005% Brodifacoum. FINAL BLOX Rodenticide takes rodenticide efficiency to another level. Its active ingredient is Brodifacoum, an anticoagulant noted for its potency.. FINAL BLOX combines this lethal poison with 16 other food-grade ingredients, producing a highly attractive bait that unsurpassed in both acceptance and control. The BLOX have corrugated edges that appeal to rodents to nibble the baits.