Fig. 1: Ampule of vitamin K. Because the tablet form of vitamin K is not currently available in Canada, the parenteral formulation can be given orally. It is dispensed in ampules of 0.5 mL (equivalent to 1.0 mg) and 1.0 mL (equivalent to 10.0 mg). The cost of treatment with 1.0 mg of parenteral vitamin K is as low as 10 cents when dispensed from an ampule of 10.0 mg/mL. Patient self-management may be a promising avenue for the use of oral vitamin K therapy in anticoagulation control.