Dosing & Uses
Dosage Forms & Strengths
lyophilized powder for reconstitution
- ~250 IU/vial of factor X activity
- ~500 IU/vial of factor X activity
- When vials are reconstituted using the sterile water for injection supplied with the kit, the final concentration is ~100 IU/mL
Factor X Deficiency
Indicated in adults and children with hereditary Factor X deficiency for
- Routine prophylaxis to reduce frequency of bleeding episodes,
- On-demand treatment and control of bleeding episodes, and
- Perioperative management of bleeding with mild, moderate, or severe hereditary Factor X deficiency
General dose information
- Dose and duration depend on the severity of the factor X deficiency, location and extent of the bleeding, and the patient’s clinical condition
- Base the dose and frequency on the individual clinical response
- Do not administer >60 IU/kg daily
Each vial is labeled with the actual factor X potency/content in International Units (IU)
Estimate in vivo peak increase in factor X
- Estimate the expected in vivo peak increase in Factor X level expressed as IU/dL (or % of normal) using the following:
- Estimated Increment of Factor X (IU/dL or % of normal) = [Total Dose (IU)/Body Weight (kg)] x 2
Calculate desired in vivo peak increase in factor X
- The dose to achieve a desired in vivo peak increase in factor X level may be calculated using the following formula:
- Dose (IU) = Body Weight (kg) x Desired Factor X Rise (IU/dL) x 0.5
- Note: The desired factor X rise is the difference between the patient’s plasma factor X level and the desired level
- The dosing formula is based on the observed recovery of 2 IU/dL per IU/kg
On-demand treatment and control of bleeding episodes
- Infuse 25 IU/kg when the first sign of bleeding occurs
- Repeat at intervals of 24 hr until the bleeding stops
Perioperative management of bleeding
- Measure postinfusion plasma factor X levels for each patient before and after surgery to ensure that hemostatic levels are obtained and maintained
- Presurgery: Calculate the dose to raise plasma factor X levels to 70-90 IU/dL using the following formula: Required dose (IU) = Body Weight (kg) x Desired Factor X Rise (IU/dL) x 0.5
- Postsurgery: Repeat dose as necessary to maintain plasma factor X levels at a minimum of 50 IU/dL until the patient is no longer at risk of bleeding
Prophylaxis of bleeding episodes
- 25 mg IV twice weekly
- Owing to inter-and intra-patient variability, it is recommended that trough blood levels of FX should be monitored at intervals, especially in the first weeks of therapy or after dosages changes
- Adjust dosage regimen to clinical response and trough levels of FX of at least 5 IU/dL
- Not to exceed peak level of 120 IU/dL
Dosing Considerations
Perioperative management of bleeding in major surgery in patients with moderate and severe hereditary factor X deficiency has not been studied
Plasma-derived human blood coagulation factor
Dosage Forms & Strengths
lyophilized powder for reconstitution
- ~250 IU/vial of factor X activity
- ~500 IU/vial of factor X activity
- When vials are reconstituted using the sterile water for injection supplied with the kit, the final concentration is ~100 IU/mL
Factor X Deficiency
Indicated in adults and children with hereditary Factor X deficiency for
- Routine prophylaxis to reduce frequency of bleeding episodes,
- On-demand treatment and control of bleeding episodes, and
- Perioperative management of bleeding with mild, moderate, or severe hereditary Factor X deficiency
General dose information
- Dose and duration depend on the severity of the factor X deficiency, location and extent of the bleeding, and the patient’s clinical condition
- Base the dose and frequency on the individual clinical response
- Do not administer >60 IU/kg daily
- Each vial is labeled with the actual factor X potency/content in International Units (IU)
Estimate in vivo peak increase in factor X
- Estimate the expected in vivo peak increase in factor X level expressed as IU/dL (or % of normal) using the following:
- <12 years: Estimated Increment of Factor X (IU/dL or % of normal) = [Total Dose (IU)/Body Weight (kg)] x 1.7
- ≥12 years: Estimated Increment of Factor X (IU/dL or % of normal) = [Total Dose (IU)/Body Weight (kg)] x 2
Calculate desired in vivo peak increase in factor X
- The dose to achieve a desired in vivo peak increase in factor X level may be calculated using the following formula:
- <12 years: Dose (IU) = Body Weight (kg) x Desired Factor X Rise (IU/dL) x 0.6
- ≥12 years: Dose (IU) = Body Weight (kg) x Desired Factor X Rise (IU/dL) x 0.5
- Note: The desired factor X rise is the difference between the patient’s plasma factor X level and the desired level
- The dosing formula is based on the observed recovery of 2 IU/dL per IU/kg
On-demand treatment and control of bleeding episodes
- <12 years: 30 IU/kg IV
- ≥12 years: 25 IU/kg IV
- Infuse when the first sign of bleeding occurs
- Repeat at intervals of 24 hr until the bleeding stops
Perioperative management of bleeding
- Measure postinfusion plasma factor X levels for each patient before and after surgery to ensure that hemostatic levels are obtained and maintained
- Presurgery: Calculate the dose to raise plasma factor X levels to 70-90 IU/dL using the following formula: Required dose (IU) = Body Weight (kg) x Desired Factor X Rise (IU/dL) x 0.5 (aged ≥12 yr) OR x 0.6 (aged <12 yr)
- Postsurgery: Repeat dose as necessary to maintain plasma factor X levels at a minimum of 50 IU/dL until the patient is no longer at risk of bleeding
Prophylaxis of bleeding episodes
- <12 years: 40 IU/kg IV twice weekly
- ≥12 years: 25 IU/kg IV twice weekly
- Owing to inter-and intra-patient variability, it is recommended that trough blood levels of FX should be monitored at intervals, especially in the first weeks of therapy or after dosages changes
- Adjust dosage regimen to clinical response and trough levels of FX of at least 5 IU/dL
- Not to exceed peak level of 120 IU/dL
Dosing Considerations
Perioperative management of bleeding in major surgery in patients with moderate and severe hereditary factor X deficiency has not been studied
Plasma-derived human blood coagulation factor
Interactions
Interaction Checker
No Results
Contraindicated
Serious - Use Alternative
Significant - Monitor Closely
Minor
Contraindicated (0)
Serious - Use Alternative (12)
- antithrombin alfa
antithrombin alfa will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- antithrombin III
antithrombin III will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- apixaban
apixaban will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- argatroban
argatroban will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- bivalirudin
bivalirudin will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- dalteparin
dalteparin will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- desirudin
desirudin will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- edoxaban
edoxaban will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- enoxaparin
enoxaparin will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- fondaparinux
fondaparinux will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- heparin
heparin will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
- rivaroxaban
rivaroxaban will decrease the level or effect of Factor X, human by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Based on the mechanism of action, Factor X is likely to be counteracted by direct and indirect Factor Xa inhibitors.
Monitor Closely (5)
- fresh frozen plasma
Factor X, human, fresh frozen plasma. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Caution is advised in patients who are receiving other plasma products that may contain Factor X, (eg, fresh frozen plasma, prothrombin complex concentrates).
- prothrombin complex concentrate, human
Factor X, human, prothrombin complex concentrate, human. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Caution is advised in patients who are receiving other plasma products that may contain Factor X, (eg, fresh frozen plasma, prothrombin complex concentrates).
- red blood cells
Factor X, human, red blood cells. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Caution is advised in patients who are receiving other plasma products that may contain Factor X, (eg, fresh frozen plasma, prothrombin complex concentrates).
- washed red blood cells
Factor X, human, washed red blood cells. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Caution is advised in patients who are receiving other plasma products that may contain Factor X, (eg, fresh frozen plasma, prothrombin complex concentrates).
- whole blood
Factor X, human, whole blood. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor. Caution is advised in patients who are receiving other plasma products that may contain Factor X, (eg, fresh frozen plasma, prothrombin complex concentrates).
Minor (0)
Adverse Effects
1-10%
Infusion site erythema (5.6%)
Fatigue (5.6%)
Back pain (5.6%)
Infusion site pain (5.6%)
Warnings
Contraindications
Documented life-threatening hypersensitivity to factor X, human or its components
Cautions
Allergic-type hypersensitivity reactions may occur (eg, anaphylaxis, angioedema, infusion site inflammation, chills, cough, dizziness, fever, flushing, generalized urticaria, headache, hives, hypotension, lethargy, musculoskeletal pains, nausea, pruritus, rash, restlessness, tachycardia, tightness of the chest, tingling, vomiting, wheezing); discontinue product immediately and administer appropriate emergency treatment
Formation of neutralizing antibodies (inhibitors) to factor X may occur; if expected factor X activity levels are not attained, or if bleeding is not controlled with an expected dose, perform an assay that measures factor X inhibitor concentration
Transmission of infectious agents may occur; the product is derived from human blood, and despite measures to screen and inactivate/remove certain viruses, it may carry risk of transmitting infectious agents (eg, viruses, the variant Creutzfeldt-Jakob disease [vCJD] agent and, theoretically, the Creutzfeldt-Jakob disease [CJD] agent)
Monitor plasma factor X activity and monitor for factor X inhibitors
Caution when coadministered with other plasma products that may contain factor X (eg, fresh frozen plasma, prothrombin complex concentrates)
Based on the mechanism of action, factor X, human is likely to be counteracted by direct and indirect factor Xa inhibitors (eg, apixaban, edoxaban, dabigatran)
Pregnancy
Pregnancy
There are no data with factor X concentrate use in pregnant women to inform on drug-associated risk
Animal reproduction studies have not been conducted
It is not known whether factor X concentrate can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity
Should be given to a pregnant woman only if clearly needed
Lactation
Unknown if distributed in human breast milk
Consider the developmental and health benefits of breastfeeding along with the mother’s clinical need for the drug, and any potential adverse effects on the breastfed infant from the drug or from the underlying maternal condition
Pregnancy Categories
A: Generally acceptable. Controlled studies in pregnant women show no evidence of fetal risk.
B: May be acceptable. Either animal studies show no risk but human studies not available or animal studies showed minor risks and human studies done and showed no risk. C: Use with caution if benefits outweigh risks. Animal studies show risk and human studies not available or neither animal nor human studies done. D: Use in LIFE-THREATENING emergencies when no safer drug available. Positive evidence of human fetal risk. X: Do not use in pregnancy. Risks involved outweigh potential benefits. Safer alternatives exist. NA: Information not available.Pharmacology
Mechanism of Action
Increases plasma levels of factor X and can temporarily correct the coagulation defect in these patients, as reflected by decrease in the aPTT and PT
Factor X is the first coagulation factor of the final common pathway (thrombin pathway); it is activated into factor Xa by both factor IX and VII, along with cofactors; Xa cleaves prothrombin in 2 places, which yields the active thrombin
Absorption
Peak plasma concentration: 0.504 IU/mL
AUC: 18 IU·hr/mL
Distribution
Vd: 56.3 mL/kg
Elimination
Half-life: 30.3 hr
Clearance: 1.35 mL/kg/hr
Mean residence time: 41.8 hr
Administration
IV Preparation
Lyophilized powder for reconstitution using Mix2Vial transfer device provided in the kit
Vials contain ~250 IU or 500 IU of factor X
When vials are reconstituted using the sterile water for injection supplied with the kit, the final concentration is ~100 IU/mL
See prescribing information for full instructions
Note: Do not shake; gently swirl during mixing process
IV Administration
For intravenous administration only following reconstitution
Use solution within 1 hr following reconstitution
Reconstituted solution should be clear or a slightly pearl-like solution; do not use if the solution is cloudy, discolored, or contains any particles
Following reconstitution, draw up solution for dose into a single syringe
Attach a suitable needle to the syringe
Administer by IV infusion at a rate of 10 mL/min; may increase rate if tolerated, but do not exceed 20 mL/min
Storage
Store in original package to protect it from light
Store in refrigerator or at room temperature (36-86°F)
Do not freeze
Do not use after the expiration date printed on the vial and carton labels (expiration date refers to the last day of that month)
Do not store reconstituted solution (use within 1 hr)
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