Vitamin K1 Injection (Phytonadione Injectable Emulsion) 10 mg/ mL by Pfizer 25/PackPfizer Vitamin K1 Injection (Phytonadione Injectable Emulsion) 1 mg 0. 5 mL Neonatal is a prescription medication used to prevent and treat vitamin K deficiency in newborn babies. It is administered by injection and contains a synthetic form of vitamin K1, which helps the body to form blood clots and prevent bleeding. This injection may be recommended for babies who are at risk of vitamin K deficiency due to complications during delivery or certain