PHYTONADIONE Drug Interactions: What You Need to Know

INTERACTIONS Anticoagulants Phytonadione Injectable Emulsion may induce temporary resistance to prothrombin-depressing anticoagulants, especially when larger doses of Phytonadione Injectable Emulsion are used. Should this occur, higher doses of anticoagulant therapy may be needed when resuming anticoagulant therapy, or a change in therapy to a different class of anticoagulant may be necessary (i.e., heparin sodium).

Phytonadione Injectable

Emulsion does not affect the anticoagulant action of heparin. Anticoagulants: May induce temporary resistance to prothrombin-depressing anticoagulants. ( 7 )

Phytonadione tablets are contraindicated in patients with a history of a hypersensitivity reaction to phytonadione or inactive ingredients [see Description ( 11 )] . Hypersensitivity to any component of this medication. ( 4 )

AND PRECAUTIONS

• Risk of Serious Adverse Reactions in Infants due to Benzyl Alcohol Preservative: Use benzyl alcohol-free phytonadione formulations in neonates and infants, if available. ( 5.2 )
• Cutaneous Reactions: May occur with parenteral use. Discontinue drug and manage medically. ( 5.3 )

5.1 Hypersensitivity Reactions Fatal and severe hypersensitivity reactions, including anaphylaxis, have occurred with intravenous or intramuscular administration of Vitamin K 1 Injection. Reactions have occurred despite dilution to avoid rapid intravenous infusion and upon first dose. These reactions have included shock, cardiorespiratory arrest, flushing, diaphoresis, chest pain, tachycardia, cyanosis, weakness, and dyspnea.

Administer

Vitamin K 1 Injection subcutaneously whenever feasible. Avoid the intravenous and intramuscular routes of administration unless the subcutaneous route is not feasible and the serious risk is justified [see Dosage and Administration (2.1) ] .

5.2 Risk of Serious Adverse Reaction in Infants due to Benzyl Alcohol Preservative Use benzyl alcohol-free phytonadione formulations in neonates and infants, if available. Serious and fatal adverse reactions including “gasping syndrome” can occur in neonates and infants treated with benzyl alcohol‑preserved drugs, including Vitamin K 1 Injection. The “gasping syndrome” is characterized by central nervous system depression, metabolic acidosis, and gasping respirations. When prescribing Vitamin K 1 Injection in infants, consider the combined daily metabolic load of benzyl alcohol from all sources including Vitamin K 1 Injection (contains 9 mg of benzyl alcohol per mL) and other drugs containing benzyl alcohol. The minimum amount of benzyl alcohol at which serious adverse reactions may occur is not known <span class="opacity-50 text-xs">[see Use in Specific Populations (8.1 , 8.2 and 8.4) ]</span> .

5.3 Cutaneous Reactions Parenteral administration of vitamin K replacements (including Vitamin K 1 Injection) may cause cutaneous reactions. Reactions have included eczematous reactions, scleroderma-like patches, urticaria, and delayed-type hypersensitivity reactions. Time of onset ranged from 1 day to a year after parenteral administration.

Discontinue

Vitamin K 1 Injection for skin reactions and institute medical management.

5.4 Aluminum Toxicity WARNING: This product contains aluminum that may be toxic. Aluminum may reach toxic levels with prolonged parenteral administration if kidney function is impaired. Premature neonates are particularly at risk because their kidneys are immature, and they require large amounts of calcium and phosphate solutions, which contain aluminum. Research indicates that patients with impaired kidney function, including premature neonates, who receive parenteral levels of aluminum at greater than 4 to 5 mcg/kg/day accumulate aluminum at levels associated with central nervous system and bone toxicity. Tissue loading may occur at even lower rates of administration.