Warfarin
(warfarin)How it works
Blocks vitamin K recycling → the liver can't finish clotting factors II, VII, IX, X. Takes 3–5 days to work fully.
You'll see
Used for
Side effects
Monitor
- INR before today's dose, every time — therapeutic usually 2–3
- Every new med (especially antibiotics) moves the INR — anticipate a recheck
- Antidote: vitamin K; 4-factor PCC/FFP for serious bleeding
🎓 Patient teaching
CONSISTENT vitamin K intake — don't binge or quit greens, keep it steady. Same time daily. Medical alert bracelet. Report dark stools, unusual bruising, any head injury.
Source: Lehne's Pharmacology for Nursing Care, 11th ed.Reference only — verify against your facility's policy.
