What are anticoagulant rodenticides?

Anticoagulant rodenticides are a group of compounds used for the control of rodent pests (rats and mice). They act by blocking a critical step in the process of blood clotting; this means blood cannot clot which leads to uncontrolled bleeding.
Examples of anticoagulant rodenticides include
• Brodifacoum
• Bromadiolone
• Chlorophacinone
• Coumatetralyl
• Difenacoum
• Difethialone
• Diphacinone
• Flocoumafen

Sources of anticoagulant rodenticide

Anticoagulant rodenticides are formulated as ready-to-use baits of variable concentrations in blocks, gels, grain, pasta baits, ‘throw packs’ and pre-baited boxes. Many products also contain
denatonium benzoate (Bitrex®) as a bittering agent. These products are often dyed. Repeated ingestion of rodents that have died from anticoagulant rodenticide poisoning is also a potential risk.
Some products are available to the public in shops – these are in small quantities and contain a limited range of chemicals.

What are the signs of poisoning?

Ingestion of an anticoagulant rodenticide can result in bleeding which can occur anywhere in the body. The bleeding may be internal and therefore not obvious. It may take several days before the bleeding starts. The clinical signs of anticoagulant rodenticide poisoning can include:
• Lethargy
• Weakness
• Cough
• Pale gums
• Breathing difficulties
• Lameness
• Black, tarry stools
• Blood in the urine
• Bruising

• Call Animal PoisonLine on 01202 509000 even if your pet is showing no signs to find out whether a trip to the vet is required.
• Remove your pet from the source of poison.
• Do not try to make your pet vomit –NEVER give salt water.
• Collect the poison and take a sample/container with you if you are advised to take your pet to the vet practice.