This medicine, known as vitamin K, is given by mouth or by injection to correct problems that interfere with normal blood clotting. It is also used in newborn infants to treat bleeding disease.

Proper Use

Take the tablets by mouth exactly as directed by your doctor. If you are receiving this medicine by injection (shots), your doctor or nurse will observe you for any adverse reactions. After a starting dose, other doses are determined by a blood test called prothrombin time (PT). This test also indicates whether the medicine is working. It is important to keep all appointments for blood tests.

Please Note

If you are taking any blood thinners, including warfarin (Coumadin), be sure to tell your doctor.

Females of childbearing age: Tell your doctor if you are pregnant or breastfeeding an infant.

Possible Side Effects

Serious (report these to your doctor right away): Allergic reaction after injection (hives, itching, rash, tightness is chest, trouble breathing).

Other: Flushing (warm feeling), sweating, rapid pulse.

Tell your doctor if you have any side effects that continue or get worse.

Possible Drug Interactions

When you take this medicine with other medicines, it may increase or decrease the effects of the medicines. Or the combination may cause harmful side effects. Some medicines that may interact with this medicine are:

• blood thinners, including warfarin (Coumadin)
• mineral oil.

Be sure that you tell all doctors who treat you about all medicines you are taking, including nonprescription products.

This educational document includes selected information only and may not include all side effects of this medicine or interactions with other medicines. Consult your doctor or pharmacist for more information or if you have any questions.

Keep all medicines out of the reach of children.
Other Names For This Medication:

AquaMEPHYTON (phytonadione, injection); K1, injection; K1, oral; Konakion (phytonadione, injection); methylphytyl napthoquinone, injection; methylphytyl napthoquinone, oral; Mephyton (phytonadione, oral); phylloquinone, oral; phylloquinone, injection; phytonadione, injection; phytonadione, oral; vitamin K, injection; vitamin K, oral