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Phytonadione
Pronounced fy-to-nah-DY-one
Brand names: Mephyton, Vitamin K1
Type: Vitamin K (clotting support) · All Other Medicines
What Phytonadione is used for
- Reversing warfarin effect when bleeding or before urgent procedures
- Preventing bleeding in newborns (injection at birth)
- Vitamin K deficiency
◆ Kidney note
Used in dialysis units for warfarin reversal and deficiency, with the same caution about prolonged warfarin resistance.
Common side effects
- Flushing and taste changes (with injections)
- Dizziness
- Injection site reactions
Important cautions
- Rapid IV injection can cause a severe allergic-type reaction — it is given slowly and by other routes when possible
- Taking it makes warfarin stop working for days to weeks, so resuming anticoagulation is planned carefully
How it comes
Tablets, injection (hospital). This guide lists forms only — it never lists strengths or doses.
Related medicines — Other Medicines
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.