Drug General Information (ID: DDIGKWTEOF)
  Drug Name Dicoumarol Drug Info Ethanol Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Anticoagulants Analgesics
  Structure

 Mechanism of Dicoumarol-Ethanol Interaction (Severity Level: Moderate)
     Increased risk of bleeding Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Dicoumarol Ethanol
      Mechanism Vitamin K antagonist Potentiate the hypoprothrombinemic effect of vitamin K antagonist
      Key Mechanism Factor 1
Factor Name Bleeding
Factor Description Patients may be at risk for bleeding when the outcome of a disease or disease treatment confounds the standard mechanisms for maintaining hemostasis. Signs or symptoms of abnormal bleeding include: bleeding that takes a long time to stop (including nosebleeds, bleeding gums, bleeding from cuts and abrasions, and menstrual bleeding); severe unexplained bruising, or bruising that becomes larger; blood in the urine or stool, etc.
      Mechanism Description
  • Increased risk of bleeding by the combination of Dicoumarol and Ethanol 

Recommended Action
      Management Patients taking oral anticoagulants should be counseled to avoid large amounts of ethanol, but moderate consumption (one to two drinks per day) are not likely to affect the response to the anticoagulant in patients with normal liver function. Frequent INR/PT monitoring is recommended, especially if alcohol intake changes considerably. It may be advisable to avoid oral anticoagulant therapy in patients with uncontrollable drinking problems. Patients should be advised to promptly report any signs of bleeding to their doctor, including pain, swelling, headache, dizziness, weakness, prolonged bleeding from cuts, increased menstrual flow, nosebleeds, bleeding of gums from brushing, unusual bleeding or bruising, red or brown urine, or red or black stools.

References
1 Cerner Multum, Inc. "UK Summary of Product Characteristics.".
2 Havrda DE, Mai T, Chonlahan J "Enhanced antithrombotic effect of warfarin associated with low-dose alcohol consumption." Pharmacotherapy 25 (2005): 303-7. [PMID: 15767245]
3 Pharmaceutical Society of Australia "APPGuide online. Australian prescription products guide online.".