Racumin Rat and Mouse Blocks are ready-to-use bait blocks for the control of rats and mice. Racumin Blocks contain Coumatetralyl, a first generation anticoagulant that works through a multi-feed system. Unlike second and third generation baits, coumatetralyl is metabolised quickly so dead rodents carry very low residues; this decreases the risk of secondary poisoning to pets or wildlife who may scavenge on the dead rodents.