— Coumarins have been associated with non‐predictable hepatic injury. In the case of dicoumarol, there is no hard evidence in the literature of a causal connection with liver damage. We report the case of a 73‐year‐old woman who developed a fatal liver disease of a mixed hepatocellular‐cholestatic type after 3 months of treatment with dicoumarol. A thorough diagnostic work‐up did not reveal any other possible cause of the liver disease.