← Drug quick-reference

Warfarin

Brand: Coumadin, Jantoven

AnticoagulantUsed for: Prevent blood clots (INR-monitored)Cardiovascular
Key warning

Boxed warning: can cause major or fatal bleeding; monitor INR regularly

Common side effects

  • Bleeding or bruising
  • Nosebleeds
  • Bleeding gums
  • Blood in urine or stool

Key interactions & cautions

  • Many drugs raise bleeding risk
  • Keep vitamin K foods steady (leafy greens)
  • Avoid alcohol excess
  • NSAIDs and aspirin raise bleeding risk

Counseling points

  • Get regular INR blood tests
  • Keep leafy-green intake consistent
  • Report unusual bleeding or dark stools
  • Use a soft toothbrush and care with sharp objects
  • Tell all providers you take a blood thinner
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