Is it safe to take phytomenadione while pregnant or breastfeeding?

Uncertain. Phytonadione has been assigned to pregnancy category c drug by the fda. Animal studies have not been reported. There are no controlled data in human pregnancy. Phytonadione is only recommended for use during pregnancy when benefit outweighs risk. Phytonadione is excreted into human milk when given in pharmacological doses. The effects on the nursing infant are unreported. Use with caution.
Yes. Yes but only under the direction of a doctor and usually for very specific medical problems only.