warfarin

noun

war·​fa·​rin ˈwȯr-fə-rən 

: a crystalline anticoagulant coumarin derivative C₁₉H₁₆O₄ that inhibits the production of prothrombin by vitamin K and is used as a rodent poison and in medicine

also : its sodium salt C₁₉H₁₅NaO₄ used especially in the prevention or treatment of thromboembolic disease

Examples of warfarin in a Sentence

Recent Examples on the Web

That could affect drugs such as warfarin, antibiotics, metformin, and Tylenol (acetaminophen). —Amber J. Tresca, Verywell Health, 20 Mar. 2025

However, some research suggests that CoQ10 does not affect warfarin metabolism at daily doses of less than 100 mg.22 Vitamin E: taking vitamin E with CoQ10 decreases the absorption of CoQ10.23 People consume an average of 3–5 mg of CoQ10 daily through the diet. —Amy Brownstein, Ms, Rdn, Verywell Health, 7 Mar. 2025

People at risk for vitamin K deficiency are those with underlying health conditions that impair the gut's absorption of vitamin K or who take certain vitamin K-interfering medications, such as antibiotics or warfarin. —Colleen Doherty, Verywell Health, 13 Feb. 2025

Consult your healthcare provider before taking ibuprofen and warfarin together.12 Summary Ibuprofen is a medication that helps reduce pain, fevers, and swelling. —Femi Aremu, Verywell Health, 3 Feb. 2025

Word History

Etymology

Wisconsin Alumni Research Foundation (its patentee) + coumarin

First Known Use

1950, in the meaning defined above

Rhymes for warfarin

• sarin

Medical Definition

warfarin

noun

war·​fa·​rin ˈwȯr-fə-rən 

: a crystalline anticoagulant coumarin derivative C₁₉H₁₆O₄ related to dicumarol that inhibits the production of prothrombin by vitamin K and is used as a rodent poison and in medicine

also : its sodium salt C₁₉H₁₅NaO₄ used especially in the prevention or treatment of thromboembolic disease see coumadin