Warfarin nursing considerations
Warfarin's nursing considerations center on the INR (therapeutic is 2 to 3 for most indications, 2.5 to 3.5 for a mechanical valve), the antidote vitamin K, and a consistent vitamin-K diet. Review the INR before dosing, hold and notify for a high INR, and teach bleeding precautions.
What warfarin does, and why the NCLEX tests it
Warfarin (Coumadin) blocks the vitamin-K-dependent clotting factors made in the liver. It works slowly over two to five days, so patients are often bridged with heparin. It is a high-alert medication with a bleeding boxed warning. The exam pairs it with its lab (INR) and antidote (vitamin K).
Key nursing considerations for warfarin
Therapeutic INR is 2 to 3 for most indications and 2.5 to 3.5 for a mechanical heart valve. Above range means high bleeding risk.
For a high INR or bleeding, anticipate vitamin K (phytonadione).
Keep intake of leafy greens steady; do not suddenly eat a lot more or less.
Use a soft toothbrush and electric razor, avoid aspirin and NSAIDs, and report tarry stools, pink urine, or unusual bruising.
Warfarin is teratogenic and contraindicated in pregnancy.
How the NCLEX turns warfarin into a question
Report any bleeding such as tarry stools, blood in the urine, or bruising, and an INR above range.
Priority review the INR before dosing; hold and notify for a high INR, and anticipate vitamin K.
Lab INR (2 to 3 typical; 2.5 to 3.5 for a mechanical valve).
Teach keep your vitamin-K foods consistent, use a soft toothbrush and electric razor, avoid aspirin and NSAIDs, and keep every INR appointment.
An INR of 5.5 with bleeding gums. Hold the warfarin, notify, and anticipate vitamin K.
Quick answers
What is the therapeutic INR for warfarin?
2 to 3 for most indications, and 2.5 to 3.5 for a mechanical heart valve. An INR above range means a high bleeding risk.
What is the antidote for warfarin?
Vitamin K (phytonadione). For serious bleeding, prothrombin complex concentrate or fresh frozen plasma may be used.
Do you avoid green vegetables on warfarin?
No, you keep them consistent. Vitamin-K foods like spinach and kale are fine as long as intake does not suddenly change a lot.
Keep studying
These pages build on each other. Work through the related classes, then pressure-test yourself against the free cheat sheet and the full guide.
Heparin
aPTT, platelets and HIT, protamine antidote.
Read the guide →Enoxaparin
LMWH injection technique: keep the bubble, do not rub.
Read the guide →Clopidogrel
Antiplatelet bleeding precautions and pre-surgery holds.
Read the guide →Warfarin INR targets
2 to 3 (2.5 to 3.5 valve), and what high or low means.
Read the guide →All high-yield drug classes
The seven most-tested classes on one page, each decoded the same way.
Open the overview →Antidotes & lab values cheat sheet
The must-know antidotes, drug levels, and lab cutoffs, free and printable.
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Every high-yield class, decoded the same way
You just read the warfarin breakdown. The full guide runs all 54 high-yield drug classes on one repeatable system, then closes with the cram tables: antidotes, therapeutic drug levels, must-know lab values, the suffix sheet, and a final-week checklist.
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