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Difenacoum structure.png
CAS number 56073-07-5 YesY
PubChem 41735
KEGG C16807 YesY
Jmol-3D images Image 1
Molecular formula C31H24O3
Molar mass 444.52 g/mol
Density 1.27 (98.7% w/w)
Melting point 211.0 – 215.0 °C (98.7% wlw)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Difenacoum is an anticoagulant of the 4-hydroxycoumarin vitamin K antagonist type. It has anticoagulant effects and is used commercially as a rodenticide.


Difenacoum is sold as blue-green pellets intended to be ingested by pests such as rats and mice.

Safety and toxicity[edit]

Because other species of mammals and birds may prey upon affected rodents, there is a risk of secondary or tertiary exposure.[1] Using radiolabeled isotopes, difenacoum (and/or its metabolites) has been shown to be distributed across many organ tissues upon oral ingestion, with the highest concentrations occurring in the liver and pancreas.[1]

Difenacoum has been shown to be highly toxic to some species of freshwater fish and green algae despite the fact that difenacoum is weakly soluble in aqueous solutions.[1]


  1. ^ a b c http://www.epa.gov/opprd001/factsheets/difenacoum.pdf