coagulation factor IX (Recombinant), Fc fusion protein


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Trade Name(s)

  • Alprolix

Ther. Class.
hemostatic agents

Pharm. Class.
clotting factor replacements


Factor IX replacement (DNA-derived) to control and prevent bleeding episodes perioperatively or prophylactically in patients with Hemophilia B.


Replaces deficient Factor IX in patients with Hemophilia B.

Therapeutic Effect(s):

Decreased incidence and severity of bleeding .


Absorption: IV administration results in complete bioavailability.

Distribution: Unknown.

Metabolism and Excretion: Used up in clotting process.

Half-life:  Adults– 86.5 hr;  children 12–17 yr– 84 hr;  children 6–11 yr– 72.2 hr;  children 2–5 yr– 66.4 hr.

TIME/ACTION PROFILE (decreased bleeding/risk of bleeding)

IVrapidunknown6–48 hr †
† Up to 10 days when used prophylactically.


Contraindicated in:

  • Known hypersensitivity.

Use Cautiously in:

  • OB:  Use in pregnancy only if clearly needed
  • Lactation: Use caution if breastfeeding;
  • Pedi:  Children <12 yr have ↑ clearance, shorter duration of action (↑ dose/kg or more frequent dosing may be required).

Adverse Reactions/Side Effects

CNS: headache


GI: perioral paresthesia

Misc: HYPERSENSITIVITY REACTIONS INCLUDING ANAPHYLAXIS, production of neutralizing antibodies (inhibitors)

* CAPITALS indicate life-threatening.
Underline indicate most frequent.



Bleeding risk may be ↑ by anticoagulants, antiplatelet agents, aspirin, fibrinolytics, NSAIDs,  SSRIs  and SNRIs.


One unit/kg increases circulating Factor IX (FIX) level by 1%.

IV (Adults and Children):  Minor and moderate bleeding–  amount needed to produce a circulating FIX level of 30–40 IU/dL, repeated every 48 hr as needed;  Major bleeding–  amount needed to produce a circulating FIX level of 80–100 IU/dL, repeat after 6–10 hr, then every 24 hr for three days, then every 48 hr until healing occurs;  Perioperative management (minor procedures)– amount needed to produce a circulating FIX level of 50–80 IU/dL as a single infusion, may be repeated after 24–48 hr until bleeding ceases and healing has occurs;  Perioperative management (major procedures)– amount needed to produce a circulating FIX level of 60–100 IU/dL as a single infusion, may be repeated after 6–10 hr and then every 24 for 3 days until bleeding ceases and healing occurs (additional doses may be given every 48 hr if needed); Routine prophylaxis– 50 IU/kg once weekly or 100 IU/kg every 10 days. Doses may be modified according to need/response.


Lyophilized powder for IV injection (requires reconstitution): 500 IU vial, 1000 IU vial, 2000 IU vial, 3000 IU vial


  • Assess for signs and symptoms of allergic reactions (angioedema, chest tightness, hypotension, rash, nausea, vomiting, paresthesia, restlessness, wheezing, dyspnea). If symptoms occur, discontinue therapy and treat symptomatically.

Lab Test Considerations:

If expected Factor IX activity levels are not attained or if bleeding is not controlled with recommended dose, perform a Bethesda assay to determine if inhibitors are present.

Potential Diagnoses


IV Administration

  • IV Push:  Allow medication and diluent to come to room temperature before use. Follow manufacturer's guidelines for mixing. Final solution should be clear to slightly opalescent and colorless. Do not shake. Do not use solutions that are discolored or contain particulate matter. Use reconstituted solution within 3 hr. Do not refrigerate or freeze after reconstitution. Do not administer reconstituted solution in same tubing or container with other medications. Vials can be stored at room temperature for up to 6 mo and then should be discarded; do not return to refrigerator.
  • Rate: Administer as a bolus infusion over several min. Determine rate based on patient's comfort; no >10 mL/min.

Patient/Family Teaching

  • May be self-administered with proper training. Instruct patient to read  Patient Information and Instructions for Use  prior to starting therapy and with each refill in case of changes.
  • Advise patient to notify health care professional immediately if signs and symptom of allergic reactions.
  • Advise female patient to notify health care professional if pregnancy is planned or suspected or if breastfeeding.

Evaluation/Desired Outcomes

Control and prevention of bleeding in adults and children with Hemophilia B.

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