What is an example of a chronic or multiple dose rodenticide?

Diphacinone is recognized as a chronic or multiple dose rodenticide because it acts as an anticoagulant that requires repeated exposure to the toxin over several days to effectively reduce the population of rodents. When rodents consume this substance, it interferes with their blood's ability to clot, leading to internal bleeding and eventual death if they do not have repeated doses.

This mode of action distinguishes diphacinone from acute rodenticides, which are designed to kill rodents more rapidly after just one or a few exposures. It is also important in pest control management to understand that chronic rodenticides like diphacinone are typically used in baiting systems where rodents can feed on the bait over time, allowing for the necessary cumulative effect to occur for effective control.

Other substances listed, such as bromethalin, cholecalciferol, and warfarin, may have different characteristics regarding their dosing and effectiveness. Bromethalin functions more as an acute rodenticide because it causes neurotoxic effects rather than relying on chronic dosing. Cholecalciferol, while it can have chronic impacts, is often classified more as an acute rodenticide due to its mechanism of action centered around calcium metabolism disruption. Warfarin, though