PHYTONADIONE: 1,271 Adverse Event Reports & Safety Profile

Phytonadione is a vitamin K replacement, which is a clear, yellow to amber, viscous, odorless or nearly odorless liquid. It is insoluble in water, soluble in chloroform and slightly soluble in ethanol. It has a molecular weight of 450.70. Phytonadione is 2-methyl-3-phytyl-1, 4-naphthoquinone. Its empirical formula is C 31 H 46 O 2 and its molecular structure is: Phytonadione Injectable Emulsion, USP injection is a yellow, sterile, aqueous colloidal solution of vitamin K 1 , with a pH of 3.5 to 7.0, available for injection by the intravenous, intramuscular, and subcutaneous routes.

Phytonadione Injectable

Emulsion, USP is available in 1 mg (1 mg/0.5 mL) single-dose pre-filled syringe.

Each

0.5 mL of Phytonadione Injectable Emulsion, USP contains the following inactive ingredients: 0.125 mg L-cysteine hydrochloride monohydrate, 10 mg polysorbate 80, 10.4 mg propylene glycol, 0.17 mg sodium acetate anhydrous, and 0.00002 mL glacial acetic acid. Additional glacial acetic acid or sodium acetate anhydrous may have been added to adjust pH to meet USP limits of 3.5 to 7.0. The air above the liquid in the individual containers has been displaced by flushing with nitrogen during the filling operation. structure

AND USAGE Phytonadione Injectable Emulsion is a vitamin K replacement indicated for the treatment of the following coagulation disorders which are due to faulty formation of factors II, VII, IX and X when caused by vitamin K deficiency or interference with vitamin K activity.

• Anticoagulant-induced hypoprothrombinemia deficiency caused by coumarin or indanedione derivatives; ( 1.1 )
• Hypoprothrombinemia due to antibacterial therapy; ( 1.1 )
• Hypoprothrombinemia secondary to factors limiting absorption or synthesis of vitamin K, e.g., obstructive jaundice, biliary fistula, sprue, ulcerative colitis, celiac disease, intestinal resection, cystic fibrosis of the pancreas, and regional enteritis; ( 1.1 )
• Other drug-induced hypoprothrombinemia where is it definitely shown that the result is due to interference with vitamin K metabolism, e.g., salicylates. ( 1.1 )

Phytonadione Injectable

Emulsion is indicated for prophylaxis and treatment of vitamin K-deficiency bleeding in neonates. ( 1.2 )

1.1 Treatment of Hypoprothrombinemia Due to Vitamin K Deficiency or Interference Phytonadione Injectable Emulsion is indicated for the treatment of the following coagulation disorders which are due to faulty formation of factors II, VII, IX and X when caused by vitamin K-deficiency or interference with vitamin K activity:

• anticoagulant-induced hypoprothrombinemia caused by coumarin or indanedione derivatives;
• hypoprothrombinemia due to antibacterial therapy;
• hypoprothrombinemia secondary to factors limiting absorption or synthesis of vitamin K, e.g., obstructive jaundice, biliary fistula, sprue, ulcerative colitis, celiac disease, intestinal resection, cystic fibrosis of the pancreas, and regional enteritis;
• other drug-induced hypoprothrombinemia where it is definitely shown that the result is due to interference with vitamin K metabolism, e.g., salicylates.

1.2 Prophylaxis and Treatment of Vitamin K-Deficiency Bleeding in Neonates Phytonadione Injectable Emulsion is indicated for prophylaxis and treatment of vitamin K-deficiency bleeding in neonates.

AND ADMINISTRATION Administer phytonadione injectable emulsion by the subcutaneous route, whenever possible. ( 2.1 ) When intravenous administration is unavoidable, inject the drug very slowly, not exceeding 1 mg per minute. ( 2.1 )

2.1 Dosing Considerations Whenever possible, administer phytonadione injectable emulsion by the subcutaneous route <span class="opacity-50 text-xs">[see Boxed Warning ]</span> . When intravenous administration is unavoidable, inject the drug very slowly, not exceeding 1 mg per minute <span class="opacity-50 text-xs">[see Warnings and Precautions ( 5.1 )]</span> . Monitor international normalized ratio (INR) regularly and as clinical conditions indicate. Use the lowest effective dose of phytonadione injectable emulsion. The coagulant effects of phytonadione injectable emulsion are not immediate; improvement of INR may take 1-8 hours. Interim use of whole blood or component therapy may also be necessary if bleeding is severe. Whenever possible, administer benzyl alcohol-free formulations in pediatric patients <span class="opacity-50 text-xs">[see Warnings and Precautions ( 5.2 ), Use in Specific Populations ( 8.4 )]</span> . When phytonadione injectable emulsion is used to correct excessive anticoagulant-induced hypoprothrombinemia, anticoagulant therapy still being indicated, the patient is again faced with the clotting hazards existing prior to starting the anticoagulant therapy. Phytonadione is not a clotting agent, but overzealous therapy with phytonadione injectable emulsion may restore conditions which originally permitted thromboembolic phenomena. Dosage should be kept as low as possible, and INR should be checked regularly as clinical conditions indicate.

2.2 Recommended Dosage for Coagulation Disorders from Vitamin K Deficiency or Interference The recommended dosage of phytonadione injectable emulsion is based on whether the hypoprothrombinemia is anticoagulant-induced (e.g., due to coumarin or indanedione derivatives) or non-anticoagulant-induced (e.g., due to antibiotics; salicylates or other drugs; factors limiting absorption or synthesis) as follows: Anticoagulant-Induced Hypoprothrombinemia: Phytonadione injectable emulsion 2.5 mg to 10 mg or more subcutaneously, intramuscularly, or intravenously. Up to 25 mg to 50 mg may be administered as a single dose. Repeated large doses of phytonadione injectable emulsion are not warranted in liver disease if the initial response is unsatisfactory. Failure to respond to phytonadione injectable emulsion may indicate that the condition being treated is inherently unresponsive to phytonadione injectable emulsion.

Hypoprothrombinemia

Due to Other Causes (Non-Anticoagulation-Induced Hypoprothrombinemia): Phytonadione injectable emulsion 2.5 mg to 25 mg or more intravenously, intramuscularly, or subcutaneously. Up to 50 mg may be administered as a single dose. Evaluate INR after 6-8 hours, and repeat dose if INR remains prolonged. Modify subsequent dosage (amount and frequency) based on the INR or clinical condition.

2.3 Recommended Dosage for Prophylaxis and Treatment of Vitamin K Deficiency Bleeding in Neonates Prophylaxis of Vitamin K-Deficiency Bleeding in Neonates The recommended dosage of phytonadione injectable emulsion is 0.5 mg to 1 mg within one hour of birth for a single dose. Treatment of Vitamin K Deficiency Bleeding in Neonates The recommended dosage of phytonadione injectable emulsion is 1 mg given either subcutaneously or intramuscularly. Consider higher doses if the mother has been receiving oral anticoagulants. A failure to respond (shortening of the INR in 2 to 4 hours) may indicate another diagnosis or coagulation disorder.

2.4 Directions for Dilution Dilute phytonadione injectable emulsion with 0.9% Sodium Chloride Injection, 5% Dextrose Injection, or 5% Dextrose and Sodium Chloride Injection. Avoid use of other diluents that may contain benzyl alcohol, which can cause serious toxicity in newborns or low birth weight infants <span class="opacity-50 text-xs">[see Warnings and Precautions ( 5.2 ) and Use in Specific Populations ( 8.4 )]</span> . When diluted, start administration of phytonadione injectable emulsion immediately after dilution. Discard unused portions of diluted solution as well as unused contents of the vial. Protect phytonadione injectable emulsion from light at all times. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit.

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 )

REACTIONS The following serious adverse reactions are described elsewhere in the labeling:

• Hypersensitivity Reactions [see WARNING AND PRECAUTIONS (5.1) ]
• Cutaneous Reactions [see WARNING AND PRECAUTIONS (5.3) ] Most common adverse reactions are cyanosis, diaphoresis, dizziness, dysgeusia, dyspnea, flushing, hypotension and tachycardia. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Amphastar Pharmaceuticals, Inc. at 1-800-423-4136, or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

6.1 Clinical Trials and Post-Marketing Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The following adverse reactions have been identified during post-apporval use of Phytonadione Injectable Emulsion. Because these reactions were reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Cardiac

Disorders: Tachycardia, hypotension. General disorders and administration site conditions: Generalized flushing; pain, swelling, and tenderness at injection site.

Hepatobiliary

Disorders: Hyperbilirubinemia Immune System Disorders: Fatal hypersensitivity reactions, anaphylactic reactions. Neurologic: Dysgeusia, dizziness. Pulmonary: Dyspnea. Skin and Subcutaneous Tissue Disorders: Erythema, pruritic plaques, scleroderma-like lesions, erythema perstans. Vascular: Cyanosis.

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.

PRECAUTIONS Drug Interactions Temporary resistance to prothrombin-depressing anticoagulants may result, especially when larger doses of phytonadione are used. If relatively large doses have been employed, it may be necessary when reinstituting anticoagulant therapy to use somewhat larger doses of the prothrombin-depressing anticoagulant, or to use one which acts on a different principle, such as heparin sodium.

Laboratory Tests

Prothrombin time should be checked regularly as clinical conditions indicate. Carcinogenesis, Mutagenesis, Impairment of Fertility Studies of carcinogenicity, mutagenesis or impairment of fertility have not been conducted with phytonadione injectable emulsion.

Pregnancy

Category C: Animal reproduction studies have not been conducted with phytonadione injectable emulsion It is also not known whether phytonadione injectable emulsion can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. Phytonadione injectable emulsion should be given to a pregnant woman only if clearly needed.

Nursing

Mothers It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when phytonadione injectable emulsion is administered to a nursing woman.

Pediatric Use

Hemolysis, jaundice, and hyperbilirubinemia in neonates, particularly those that are premature, may be related to the dose of phytonadione injectable emulsion. Therefore, the recommended dose should not be exceeded (see ADVERSE REACTIONS and DOSAGE AND ADMINISTRATION ).

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 )