Ready-to-use bait to help eliminate mouse infestation. contains a bitter substance (denatonium benzoate) designed to reduce the risk of accidental ingestion by children. It can be used in and around industrial, rural, and civil buildings, warehouses, houses, basements, garages, and closets. Due to their delayed mode of action, anticoagulant rodenticides may take 4 to 10 days after baiting to be effective.