How to explain warfarin
Other platforms explain it with text and video. In VMS you practice it on the patient.
Warfarin prevents dangerous clots but has many interactions and needs regular blood tests. Good teaching prevents both bleeding and clots.
Step by step
Explain why
Warfarin slows clotting to prevent strokes and clots in the legs or lungs. [1]
Explain the INR
This blood test shows how slowly the blood clots. Most patients aim for 2 to 3; some heart valves need a higher target. [2]
Talk about vitamin K
Keep the amount of green leafy vegetables steady from week to week rather than avoiding them. [2]
Warn about interactions
Many antibiotics, aspirin, NSAIDs and supplements change warfarin's effect. Check before starting anything new. [2]
Teach bleeding signs
Black stools, blood in the urine, large bruises, nosebleeds that will not stop or a sudden severe headache need urgent care. [3]
Explain missed doses
Take it the same day if remembered. Never double the dose the next day, and tell the clinic. [2]
Use teach-back
Ask the patient what they will do if they see signs of bleeding. [4]
Common errors
- Telling patients to avoid all green vegetables.
- Forgetting to warn about drug interactions.
- Not giving a plan for missed doses.
Typical INR targets [2]
| Situation | Target INR | Note |
|---|---|---|
| Not on warfarin | about 1.0 | Normal clotting |
| Most uses (atrial fibrillation, DVT, PE) | 2.0 to 3.0 | Standard goal |
| Mechanical mitral valve | 2.5 to 3.5 | Higher goal |
Practice it in VMS
In VMS you do this on the patient, not on paper: every step goes on the checklist with a score, and in Teach mode Blocky tells you what comes next.
VMS cases that train this skill
Sources
- AAMC Core Entrustable Professional Activities (Core EPAs)
- Open RN, Nursing Pharmacology 2e (CC BY 4.0)
- The Joint Commission, National Patient Safety Goals
- AHRQ Health Literacy Universal Precautions Toolkit (Teach-Back)
Facts and steps follow AAMC Core Entrustable Professional Activities (Core EPAs); AHRQ Health Literacy Universal Precautions Toolkit (Teach-Back). VMS is not affiliated with these organizations. Updated: 2026-10-11.