Warfarin (Coumadin)

Hematology (Vitamin K Antagonist)

Dosing & Administration

Adult Dose

Initial: 2-5 mg PO daily. Titrate to target INR (usually 2.0-3.0).

Pediatric Dose

0.1-0.2 mg/kg/day PO.

Renal Adjustment

No specific adjustment, but monitor INR closely.

Hepatic Adjustment

Use extreme caution; lower doses required.

Safety & Special Populations

Pregnancy Category

X - Teratogenic (except mechanical valves where benefits may outweigh).

Lactation Safety

Compatible.

Contraindications & Adverse Effects

Contraindications

  • Pregnancy
  • Bleeding tendencies
  • Recent neurosurgery

Common Adverse Effects

  • Bleeding
  • Skin necrosis
  • Purple toe syndrome