vitamin K (Phytonadione (Vitamin K1), Menadione (Vitamin K3), Phytomenadione) — Uses, Dosage, Side Effects & Safety

Drug class: Vitamin, Hemostatic agent

Overview

Vitamin K is an essential nutrient that plays a critical role in blood clotting and bone health. It is used to prevent and treat vitamin K deficiency, which can lead to excessive bleeding. Vitamin K is also given to newborns to prevent a rare but serious bleeding disorder called vitamin K deficiency bleeding (VKDB). This vitamin works by helping your body produce clotting factors, which are proteins needed for your blood to clot properly. It is commonly used to reverse the effects of blood thinners like warfarin in cases of overdose or when rapid reversal of anticoagulation is needed. Key points: Vitamin K is generally safe when used as directed. It is available in several forms, including oral tablets and injections. Always follow your healthcare provider's instructions regarding dosing and administration.

Therapeutic uses

  • Vitamin K deficiency
  • Anticoagulant-induced prothrombin deficiency
  • Hemorrhagic disease of the newborn
  • Hypoprothrombinemia due to malabsorption or liver disease

Common side effects

  • Flushing
  • Dizziness
  • Rapid pulse
  • Sweating
  • Hypotension
  • Anaphylaxis
  • Injection site reactions

Frequently Asked Questions about vitamin K

What is vitamin K used for?

Vitamin K is used to prevent and treat bleeding caused by vitamin K deficiency, reverse the effects of blood thinners like warfarin, and prevent bleeding in newborns.

How does vitamin K work in the body?

Vitamin K helps your body make clotting factors, which are proteins needed for your blood to clot and stop bleeding.

Can I take vitamin K with warfarin?

Vitamin K can reduce the effectiveness of warfarin. Do not take vitamin K supplements without consulting your doctor if you are on warfarin or other anticoagulants.

Is vitamin K safe during pregnancy and breastfeeding?

Vitamin K is generally considered safe during pregnancy and breastfeeding when used as directed. Always consult your healthcare provider before use.

What foods are high in vitamin K?

Leafy green vegetables (such as spinach, kale, and broccoli), certain vegetable oils, and some fruits are high in vitamin K.

What are the signs of vitamin K deficiency?

Signs include easy bruising, excessive bleeding, blood in urine or stool, and, in newborns, unexplained bleeding.

How is vitamin K given to newborns?

Vitamin K is usually given as a single injection in the thigh shortly after birth to prevent vitamin K deficiency bleeding.

Educational information only. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.