Word
warfarin
Phoneticswar·farin
UK/wˈɔːfəɹˌɪn/
Uncountable noun
Definition
n. a medicine that thins your blood so dangerous clots do not form. Doctors give it to people with heart problems or a high risk of stroke.
n. an oral anticoagulant that blocks vitamin K-dependent clotting factors, prescribed to prevent thrombosis, embolism, and stroke in at-risk patients.
Examples
“He takes warfarin every morning to thin his blood.”
“After her heart valve surgery, the doctor prescribes warfarin and checks her blood regularly.”
“Because warfarin interacts with leafy greens and many common drugs, patients on long-term therapy require frequent INR monitoring to keep clotting levels within a narrow safe range.”
Examples
simple
“He takes warfarin every morning to thin his blood.”
contextual
“After her heart valve surgery, the doctor prescribes warfarin and checks her blood regularly.”
complex
“Because warfarin interacts with leafy greens and many common drugs, patients on long-term therapy require frequent INR monitoring to keep clotting levels within a narrow safe range.”
Collocations
Common phrases and expressions where native English speakers use the word “warfarin” in context.
Verb
01. adjust warfarin
“Doctors adjust warfarin carefully based on weekly INR results.”
verb + noun
02. discontinue warfarin
“She was told to discontinue warfarin five days before surgery.”
verb + noun
03. initiate warfarin
“They initiated warfarin immediately after the diagnosis of thrombosis.”
verb + noun
04. prescribe warfarin
“The cardiologist prescribed warfarin for her atrial fibrillation.”
verb + noun
Adjective
05. long-term warfarin
“Long-term warfarin is often prescribed after mechanical valve replacement.”
adj + noun
06. low-dose warfarin
“She was maintained on low-dose warfarin after her pulmonary embolism.”
adj + noun
07. oral warfarin
“Oral warfarin requires regular blood tests to monitor clotting time.”
adj + noun
Noun
08. dose of warfarin
“The dose of warfarin was lowered after his INR came back high.”
noun + prep + noun
09. effect of warfarin
“Spinach can reduce the effect of warfarin because of vitamin K.”
noun + prep + noun
10. adjust dose of warfarin
“The clinic will adjust the dose of warfarin after checking your INR.”
11. be on long-term warfarin
“He has been on long-term warfarin since his valve replacement.”
12. interact badly with warfarin
“Some antibiotics interact badly with warfarin and raise bleeding risk.”
Real-World Examples
“For millions of heart patients, a pair of new blood thinners have been heralded as the first replacements in 60 years for warfarin, a pill whose hardships and risks have deterred many from using the stroke-prevention medicine.” “A handful of people taking the popular anticoagulant warfarin complained that drinking large amounts of cranberry juice seemed to heighten the drug’s effects, causing unusual bleeding.” “The National Institute of Health and Care Excellence says blood-thinning drugs like warfarin are better for those with atrial fibrillation, which can increase a person's risk of stroke.” “My treatment was straightforward: anticoagulants to prevent a new stroke (the main anticoagulant, warfarin, was first used as rat poison), and antiarrythmia drugs to fix the AF.” Etymology
From Wisconsin Alumni Research Foundation + (coum)arin.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.
Related words
- Exam level
- CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.C2 ProficiencyIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.8.5–9.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 6.0114–120
- Frequency
- Occasional
- Level
- C2 · Proficiency
- Updated
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