CyKill Bait Packs For Mice and Rats 0.75 oz 100 pkBromethalin was developed to combat a world wide perceived problem of rodent resistance to warfarin like anticoagulant rodenticides. A highly potent neurotoxin rodenticide that provides a lethal dose to rodents in a single feeding. Bromethalin attacks the central nervous system; rodents usually consume a lethal dose within a single nights feeding, with the first dead rodents appearing within 2 days. Rodents stop feeding after consuming a lethal dose;