Answer
Phytomenadione (vitamin K1) has a plasma half-life of approximately 72 hours in neonates and about 1.5–3 hours in adults.
Sources for this answer
- Konakion MM Paediatric / Phytomenadione 2 mg/0.2 ml solution for injectionNeon Healthcare Ltd · emc · SmPC §5.2 Pharmacokinetic properties · Version 6Document updated
Sources checked