• ٧٨٦
Enroll For Free
← Back to All Calculators
Pharmacology / Drug Dosing
Warfarin Dosing Nomogram

Warfarin Dosing Nomogram

INR-based dose adjustment for anticoagulation management

Patient Parameters
Required (0.5–20)
Required (0.5–200)
—
New Weekly Dose (mg)
—
Avg Daily Dose (mg)
—
Dose Change
INR (target 2–3)ActionDose Adjustment
< 1.5SubtherapeuticIncrease weekly dose 15–20%
1.5–1.9Below targetIncrease weekly dose 5–10%
2.0–3.0TherapeuticNo change
3.1–3.5SupratherapeuticDecrease weekly dose 5–10%
3.6–4.0HighHold 0–1 dose; decrease 10–15%
> 4.0Very high / DangerousHold; reassess; vitamin K if indicated
Reversal guidance: INR 4–10 (no bleeding): hold warfarin, recheck INR. INR >10 (no bleeding): vitamin K 2.5–5 mg PO. Any significant bleeding: 4-factor PCC + vitamin K 5–10 mg IV. Recheck INR 3–7 days after dose change.
For qualified healthcare professionals only. Not a substitute for clinical judgment.

Select a Template for your Cv