Brodifacoum (brodifacoun) is also known as Dailong, brodifacoum, brodifacoum, brodifacoum, brodifacoum, benzodiazepine. This product is white or gray powder. Brodifacoum is the second generation of anticoagulant rodenticide, its toxicity is stronger than that of rodenticide, brodifacoum has a longer half-life in the body, so its anticoagulant effect is also longer. It has high toxicity and belongs to hydroxycoumarin class anticoagulant rodenticide. The literature reports that the half-life of brodifacoum in blood is 56 days, and the total excretion time is up to 209 days. There is a certain latency period for patients to bleed, and it takes 5-70 days to fully recover the coagulation index after treatment. Therefore, for patients with long-acting anticoagulant rodenticide poisoning, the treatment time should be longer, and the coagulation factor function should be measured regularly to prevent secondary bleeding.