MEDIPHYTO INJECTION

Indications

• Vitamin K deficiency
• Prophylaxis and treatment of bleeding disorders
• Management of anticoagulant-related coagulopathy
• Support for bone health in vitamin K deficiency

Dosage

Children: Pediatric dosing should be based on clinical guidelines and individual patient needs. Refer to the BNF for Children for specific dosing recommendations.

Adults: Dosing varies based on clinical indications and should be determined by a healthcare provider. Generally, vitamin K1 is given as a single oral dose or a series of doses depending on the severity of deficiency or bleeding.

Mechanism of action

Phytomendione acts by serving as a cofactor for the enzyme gamma-glutamyl carboxylase. This enzyme catalyzes the post-translational modification of specific proteins involved in clotting, such as prothrombin (factor II), and other vitamin K-dependent clotting factors (VII, IX, and X). The carboxylation process allows for the binding of calcium ions, which is critical for the function of these proteins in hemostasis.

Pharmacodynamics

The pharmacodynamics of phytomendione involve its role in the coagulation cascade. By facilitating the synthesis of clotting factors, it promotes hemostasis and prevents excessive bleeding. Additionally, it is implicated in bone health through its involvement in the synthesis of osteocalcin, a protein that helps in the regulation of bone mineralization and calcium homeostasis.

Pharmacokinetics

Phytomendione is absorbed in the intestine along with dietary fats. It is transported in the bloodstream bound to lipoproteins. The vitamin is stored in the liver, and its half-life can vary from several hours to days depending on the individual's vitamin K status and dietary intake. Metabolism occurs primarily in the liver, where it is converted into its active forms, and excretion is mainly via bile.

Contra-indications

• Hypersensitivity to phytomendione or any of its components
• Severe liver disease
• Active bleeding disorders

Adverse effects

• Nausea
• Vomiting
• Diarrhea
• Abdominal cramps
• Rash
• Allergic reactions
• Anaphylaxis (rare)

Interactions

• Anticoagulants (e.g., warfarin) may have their effects altered
• Certain antibiotics (e.g., cephalosporins) may reduce the effectiveness of phytomendione
• Cholestyramine may reduce absorption of phytomendione
• Prothrombin complex concentrates may enhance the effects of phytomendione

Precautions

• Use with caution in patients with liver impairment
• Monitor prothrombin time in patients taking anticoagulants
• Assess vitamin K levels in patients with malabsorption syndromes

Pregnancy

Phytomendione is generally considered safe during pregnancy. However, it is advisable to consult a healthcare professional before use.

Breast-feeding

Phytomendione is excreted in breast milk, but it is considered safe for use during breastfeeding. Consultation with a healthcare professional is recommended.

Storage

Store in a cool, dry place away from direct sunlight. Keep out of reach of children.

Formulations

• Injection solution
• Oral tablets
• Oral liquid