What is the dosage of Hizentra?

Hizentra is available in 8 dosages, including 200 mg/ml Prefilled Syringe 5 ml, 200 mg/ml Injection 10 ml, 200 mg/ml Injection 5 ml, 200 mg/ml Prefilled Syringe 50 ml, 200 mg/ml Injection 50 ml, 200 mg/ml Injection 20 ml, 200 mg/ml Prefilled Syringe 10 ml and 200 mg/ml Prefilled Syringe 20 ml

What does Hizentra treat?

Hizentra treats Immunologic Deficiency Syndromes

What is Hizentra made of?

Hizentra contains immunoglobulin G which is a Human Immunoglobulin G

How is Hizentra administered?

Hizentra is administered as a Injectable

What is Hizentra mechanism of action?

Hizentra mechanism of action is Antigen Neutralization

Last Update: Jan, 17 2025

Hizentra

(immunoglobulin G, human)

BOXED WARNING

Dosage & Administration

For subcutaneous infusion only.

Dose

Before switching to HIZENTRA, obtain the patient's serum IgG trough level to guide subsequent dose adjustments.

* Weekly: Start HIZENTRA 1 week after last Immune Globulin Intravenous (Human) (IGIV) infusion.

Initial weekly dose =	Previous IGIV dose (in grams) × 1.37
	No. of weeks between IGIV doses

* Biweekly (every 2 weeks): Start HIZENTRA 1 or 2 weeks after the last IGIV infusion or 1 week after the last weekly IGSC infusion. Administer twice the calculated weekly dose.
* Frequent dosing (2 to 7 times per week): Start HIZENTRA 1 week after the last IGIV or IGSC infusion. Divide the calculated weekly dose by the desired number of times per week.
* Adjust the dose based on clinical response and serum IgG trough levels.

CIDP

* Initiate therapy with HIZENTRA 1 week after the last IGIV infusion.
* Recommended subcutaneous dose is 0.2 g/kg (1 mL/kg) body weight per week.
* In the clinical study after transitioning from IGIV to HIZENTRA, a dose of 0.4 g/kg (2 mL/kg) body weight per week was also safe and effective to prevent CIDP relapse.

* If CIDP symptoms worsen, on 0.2 g/kg (1 mL/kg) body weight per week, consider increasing the HIZENTRA dose from 0.2 g/kg to 0.4 g/kg body weight per week.
* If CIDP symptoms worsen on 0.4 g/kg body weight per week, consider re-initiating therapy with IGIV, while discontinuing HIZENTRA.

* Monitor patient's clinical response and adjust duration of therapy based on patient need.

Administration

* PI: Administer at regular intervals from daily up to every 2 weeks.
* CIDP: Administer weekly.
* Infusion sites – Up to 8 infusion sites are allowed simultaneously, with at least 2 inches between sites.

Administration in PI
Infusion Parameters *	1st Infusion	Subsequent Infusions
* As tolerated
Volume (mL/site)	≤15	≤25
Rate (mL/hr/site)	≤15	≤25

Administration in CIDP
Infusion Parameters *	1st Infusion	Subsequent Infusions
* As tolerated
Volume (mL/site)	≤20	≤50
Rate (mL/hr/site)	≤20	≤50

Get Your Patient on Hizentra

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Hizentra Prescribing Information

WARNING: THROMBOSIS

See full prescribing information for complete boxed warning.

Thrombosis may occur with immune globulin products, including HIZENTRA. Risk factors may include: advanced age, prolonged immobilization, hypercoagulable conditions, history of venous or arterial thrombosis, use of estrogens, indwelling vascular catheters, hyperviscosity, and cardiovascular risk factors.
For patients at risk of thrombosis, administer HIZENTRA at the minimum dose and infusion rate practicable. Ensure adequate hydration in patients before administration. Monitor for signs and symptoms of thrombosis and assess blood viscosity in patients at risk for hyperviscosity.

HIZENTRA is an Immune Globulin Subcutaneous (Human) (IGSC), 20% Liquid indicated for the treatment of the following conditions:

Primary Immunodeficiency (PI)

HIZENTRA is indicated as replacement therapy for primary humoral immunodeficiency (PI) in adults and pediatric patients 2 years of age and older. This includes, but is not limited to, the humoral immune defect in congenital agammaglobulinemia, common variable immunodeficiency, X-linked agammaglobulinemia, Wiskott-Aldrich syndrome, and severe combined immunodeficiencies.

Chronic Inflammatory Demyelinating Polyneuropathy (CIDP)

HIZENTRA is indicated for the treatment of adult patients with chronic inflammatory demyelinating polyneuropathy (CIDP) as maintenance therapy to prevent relapse of neuromuscular disability and impairment.

Limitations of Use:

HIZENTRA maintenance therapy in CIDP has been systematically studied for 6 months and for a further 12 months in a follow-up study. Maintenance therapy beyond these periods should be individualized based upon the patient's response and need for continued therapy [see Dosage and Administration (2)].

For subcutaneous infusion only.

Preparation and Handling

HIZENTRA is a clear and pale yellow to light brown solution. Do not use if the solution is cloudy or contains particulates.

Prior to administration, visually inspect each prefilled syringe or vial of HIZENTRA for particulate matter or discoloration, whenever the solution and container permit.
Do not freeze. Do not use any solution that has been frozen.
Check the product expiration date on the prefilled syringe or vial label. Do not use beyond the expiration date.
Do not mix HIZENTRA with other products.
Do not shake the prefilled syringe or vial.
Use aseptic technique when preparing and administering this product.
Both the HIZENTRA prefilled syringe and vial are single-dose containers. Multiple HIZENTRA prefilled syringes or vials can be administered to achieve the prescribed dose. Discard all used administration supplies and any unused product immediately after each infusion in accordance with local requirements.

Dose

Primary Immunodeficiency (PI)

HIZENTRA can be administered at regular intervals from daily up to every 2 weeks (biweekly).
Individualize the dose based on the patient's clinical response to HIZENTRA therapy and serum immunoglobulin G (IgG) trough levels.
Before receiving treatment with HIZENTRA:
- Ensure that patients have received Immune Globulin Intravenous (Human) (IGIV) treatment at regular intervals for at least 3 months.
- Obtain the patient's serum IgG trough level to guide subsequent dose adjustments (see below, under Dose Adjustment).

Dosage for patients switching to HIZENTRA from IGIV

Establish the initial weekly dose of HIZENTRA by converting the monthly IGIV dose into a weekly equivalent and increasing it using the dose adjustment factor. The goal is to achieve a systemic serum IgG exposure (area under the concentration-time curve [AUC]) not inferior to that of the previous IGIV treatment.
- To calculate the initial weekly dose of HIZENTRA, divide the previous IGIV dose in grams by the number of weeks between doses during the patient's IGIV treatment (e.g., 3 or 4); then multiply this by the dose adjustment factor of 1.37 [see Clinical Pharmacology (12.3, Table 9)].
  Initial HIZENTRA dose = Previous IGIV dose (in grams) × 1.37
  Number of weeks between IGIV doses
- To convert the HIZENTRA dose (in grams) to milliliters (mL), multiply the calculated dose (in grams) by 5.
Provided the total weekly dose is maintained, any dosing interval from daily up to biweekly can be used and will result in systemic serum IgG exposure that is comparable to the previous IGIV or weekly HIZENTRA treatment [see Clinical Pharmacology (12.3)].
For biweekly dosing, multiply the calculated HIZENTRA weekly dose by 2.
For frequent dosing (2 to 7 times per week), divide the calculated weekly dose by the desired number of times per week (e.g., for 3 times per week dosing, divide weekly dose by 3).

Dosage for patients switching to HIZENTRA from IGSC

The previous weekly IGSC dose should be maintained.
For biweekly dosing, multiply the previous weekly dose by 2.
For frequent dosing (2 to 7 times per week), divide the previous weekly dose by the desired number of times per week (e.g., for 3 times per week dosing, divide weekly dose by 3).

Start HIZENTRA treatment

For weekly or frequent dosing, start treatment with HIZENTRA 1 week after the patient's last IGIV infusion or IGSC infusion.
For biweekly dosing, start treatment 1 or 2 weeks after the last IGIV infusion or 1 week after the last weekly IGSC infusion.

Dose Adjustment

The dose may need to be adjusted to achieve the desired clinical response and serum IgG trough level, irrespective of the frequency of administration.

To determine if a dose adjustment should be considered, measure the patient's serum IgG trough level 2 to 3 months after switching to HIZENTRA.

Weekly dosing: When switching from IGIV to weekly HIZENTRA dosing, the target serum IgG trough level is projected to be approximately 16% higher than the last trough level during prior IGIV therapy [see Clinical Pharmacology (12.3)].

Biweekly dosing: When switching from IGIV to biweekly HIZENTRA dosing, the target serum IgG trough level is projected to be approximately 10% higher than the last IGIV trough level. When switching from weekly to biweekly dosing, the target trough is projected to be approximately 5% lower than the last trough level on weekly therapy [see Clinical Pharmacology (12.3)].

Frequent dosing: When switching from weekly dosing to more frequent dosing, the target serum IgG trough level is projected to be approximately 3 to 4% higher than the last trough level on weekly therapy [see Clinical Pharmacology (12.3)].

To adjust the dose based on serum trough levels, calculate the difference (in mg/dL) between the patient's IgG trough level obtained 2 to 3 months following the switch from IGIV or the last IGSC dose adjustment and the target IgG trough level for weekly or biweekly dosing. Then find this difference in Table 1 (Column 1) and, based on the HIZENTRA dosing frequency (for weekly or biweekly) and the patient's body weight, locate the corresponding adjustment amount (in mL) by which to increase (or decrease) the dose. For frequent dosing, add the weekly increment from Table 1 to the weekly-equivalent dose and then divide by the number of days of dosing.

Use the patient's clinical response as the primary consideration in dose adjustment. Additional dosage increments may be indicated based on the patient's clinical response (infection frequency and severity).

Table 1. Incremental Adjustment (mL) * of the HIZENTRA Dose † Based on the Difference (±mg/dL) from the Target Serum IgG Trough Level
Difference From Target Serum IgG Trough Level (mg/dL)	Dosing Frequency	Weight Adjusted Dose Increment (mL) *
		Weight Group
		>10 to ≤30 kg	>30 to ≤50 kg	>50 to ≤70 kg	>70 to ≤90 kg	>90 kg
n/a, not applicable.
* Incremental adjustments based on slopes of the pharmacometric model-predicted relationship between serum IgG trough level and HIZENTRA dose increments of 1 mg/kg per week. † Includes biweekly, weekly or frequent dosing. ‡ To determine the dose increment for frequent dosing, add the weekly increment to the weekly-equivalent dose and then divide by the number of days of dosing.
50	Weekly ‡	n/a	2.5	5	5	10
50	Biweekly	5	5	10	10	20

100	Weekly ‡	2.5	5	10	10	15
100	Biweekly	5	10	20	20	30

200	Weekly ‡	5	10	15	20	30
200	Biweekly	10	20	30	40	60

For example, if a patient with a body weight of 70 kg has an actual IgG trough level of 900 mg/dL and the target trough level is 1000 mg/dL, this results in a difference of 100 mg/dL. Therefore, increase the weekly dose of HIZENTRA by 10 mL. For biweekly dosing, increase the biweekly dose by 20 mL. For 2 times per week dosing, increase the dose by 5 mL.

Monitor the patient's clinical response, and repeat the dose adjustment as needed.

Dosage requirements for patients switching to HIZENTRA from another IGSC product: If a patient on HIZENTRA does not maintain an adequate clinical response or a serum IgG trough level equivalent to that of the previous IGSC treatment, the physician may want to adjust the dose. For such patients, Table 1 also provides guidance for dose adjustment if their desired IGSC trough level is known.

Measles Exposure

Administer a minimum total weekly HIZENTRA dose of 0.2 g/kg body weight for 2 consecutive weeks if a patient is at risk of measles exposure (i.e., due to an outbreak in the U.S. or travel to endemic areas outside of the U.S.). For biweekly dosing, one infusion of a minimum at 400 mg/kg is recommended. If a patient has been exposed to measles, ensure this minimum dose is administered as soon as possible after exposure.

Chronic Inflammatory Demyelinating Polyneuropathy (CIDP)

Initiate therapy with HIZENTRA 1 week after the last IGIV infusion.
The recommended subcutaneous dose is 0.2 g/kg (1 mL/kg) body weight per week, administered in 1 or 2 sessions over 1 or 2 consecutive days.
-
In the clinical study after transitioning from IGIV to HIZENTRA treatment, a dose of 0.4 g/kg (2 mL/kg) body weight per week was also safe and effective in preventing CIDP relapse.
If CIDP symptoms worsen on 0.2 g/kg (1 mL/kg) body weight per week, consider increasing the HIZENTRA dose from 0.2 g/kg (1 mL/kg) to 0.4 g/kg (2 mL/kg) body weight per week, administered in 2 sessions per week over 1 or 2 consecutive days.
-
If CIDP symptoms worsen on the 0.4 g/kg body weight per week dose, consider re-initiating therapy with an IGIV product approved for treatment of CIDP, while discontinuing HIZENTRA.
Monitor the patient's clinical response and adjust the duration of therapy based on patient need.

Administration

HIZENTRA is for subcutaneous infusion only.

HIZENTRA is intended for subcutaneous administration using an infusion pump. Infuse HIZENTRA in the abdomen, thigh, upper arm, and/or lateral hip.

Infusion sites – A HIZENTRA dose may be infused into multiple infusion sites. Use up to 8 infusion sites in parallel. More than one infusion device can be used simultaneously. Infusion sites should be at least 2 inches apart. Change the actual site of infusion with each administration.
Volume (as tolerated) – For the first infusion of HIZENTRA, do not exceed a volume of 15 mL per infusion site in patients with PI or up to 20 mL per infusion site in patients with CIDP. For subsequent infusions, the volume may be increased to 25 mL per infusion site for patients with PI or to 50 mL per site for patients with CIDP.
Rate (as tolerated) – For the first infusion of HIZENTRA, the recommended flow rate is up to 15 mL per hour per infusion site in patients with PI or up to 20 mL per hour per site in patients with CIDP. For subsequent infusions, the flow rate may be increased to 25 mL per hour per site in patients with PI or up to 50 mL per hour per site in patients with CIDP.

Follow the steps below and use aseptic technique to administer HIZENTRA, either as prefilled syringe(s) or vial(s).

1.

Assemble supplies Gather the HIZENTRA prefilled syringe(s) or vial(s), all supplies, and infusion log book.

2.

Clean surface Clean a table or other flat surface.

3.

Wash hands – Thoroughly wash and dry hands (Figure 1).

Figure 1

4.

Check prefilled syringe(s) or vial(s):

If using prefilled syringes, carefully peel back the transparent covering from the tray and inspect the protective cap. Peel back the outer layer of the wrap-around label to allow for viewing of HIZENTRA through the fully transparent inner layer, but don't remove the label completely (Figure 2).
Figure 2
If using vials, inspect the protective cap of the vials (Figure 3).
Figure 3

Carefully inspect each prefilled syringe(s) or vial(s) of HIZENTRA. HIZENTRA is a clear and pale yellow to light brown solution. Do not use the prefilled syringe or vial if damaged, the liquid looks cloudy, contains particles, has changed color, the protective cap of the prefilled syringe or the vial is missing or defective, or the expiration date on the label has passed.

5.

Prepare HIZENTRA for infusion
If using HIZENTRA prefilled syringes, go to Step 5.1
If using HIZENTRA vials, go to Step 5.2

5.1

HIZENTRA prefilled syringe(s)

The 5 mL, 10 mL, 20 mL, and 50 mL prefilled syringes are supplied and ready to use. The 5 mL and 10 mL prefilled syringes are fully assembled (Figure 4). For the 20 mL and 50 mL prefilled syringes, screw the plunger rod onto the prefilled syringe stopper prior to use (Figure 5).
Figure 4

Figure 5
HIZENTRA prefilled syringes can be placed directly in the infusion pump if the prefilled syringe size matches the pump requirements. If the prefilled syringe can be placed directly in the infusion pump, then go to Step 6.
NOTE:
An additional adapter may be required for the HIZENTRA prefilled syringes to fit properly in the infusion pump. Check with the provider of your supplies for the appropriate adapter and installation instructions.
If the HIZENTRA prefilled syringe size does not match the infusion pump requirements, transfer the contents of the prefilled syringe to another syringe of a size specific for the infusion pump by following the directions below:
- Use a syringe-to-syringe transfer device (tip-to-tip connector) (Figure 6) to transfer the contents of the prefilled syringe to the empty syringe specific for the infusion pump.
  Figure 6
- Remove the protective cap from the prefilled syringe. Attach the transfer device (tip-to-tip connector) by twisting it onto the prefilled syringe. Attach the empty syringe by screwing it onto the other side of the transfer device (Figure 7).
  Figure 7
- Make sure you transfer the amount needed to achieve the prescribed dose.
  - Measure dose from the top of the stopper
- Push the plunger of the prefilled syringe (e.g., using your fingers, thumb or the palm of your hand) to transfer HIZENTRA from the prefilled syringe to the empty syringe.
  - Repeat this step if multiple prefilled syringes are necessary to achieve the prescribed dose. Remove the emptied prefilled syringe and attach another prefilled syringe to the transfer device (tip-to-tip connector).
- After the transfer is complete, remove the emptied prefilled syringe and the transfer device (tip-to-tip connector) by unscrewing them from the syringe specific for your pump. Connect the filled syringe to the infusion tubing.

Go to Step 6.

5.2

Transfer HIZENTRA from vial to syringe

Take the protective cap off the vial (Figure 8).
Figure 8
Clean the vial stopper with an alcohol wipe (Figure 9). Let the stopper dry.
Figure 9
If using a transfer device, follow the instructions provided by the device manufacturer.
If using a needle and a syringe to transfer HIZENTRA, follow the instructions below:
- Attach a sterile transfer needle to a sterile syringe (Figure 10).
  Figure 10
- Pull out the plunger of the syringe to fill the syringe with air. Make sure that the amount of air is the same as the amount of HIZENTRA you will transfer from the vial.
- Put the HIZENTRA vial on a flat surface. Keeping the vial upright, insert the transfer needle into the center of the rubber stopper.
- Check that the tip of the needle is not in the liquid. Then, push the plunger of the syringe down. This will inject the air from the syringe into the airspace of the vial.
- Leaving the needle in the stopper, carefully turn the vial upside down (Figure 11).
  Figure 11
- Slowly pull back on the plunger of the syringe to fill the syringe with HIZENTRA.
- Take the filled syringe and needle out of the stopper.
- Take off the needle and throw it away in the sharps container.

When using multiple vials to achieve the prescribed dose, repeat this step.

6.

Prepare infusion pump and tubing

Prior to preparing the pump(s), make sure you have the prescribed dose in the syringe(s) and the infusion tubing is attached.
Prepare the infusion pump following the manufacturer's instructions, including attaching any necessary adapters.
Do not remove the needle caps until you are ready to infuse.
- Prime (fill) the infusion. To prime the tubing, connect the syringe filled with HIZENTRA to the infusion tubing and gently push on the syringe plunger (e.g., using your fingers or thumb or the palm of your hand) to fill the tubing with HIZENTRA (Figure 12).
  Figure 12
- Stop priming before HIZENTRA fluid reaches the capped needle.
- Insert the syringe filled with HIZENTRA into the infusion pump.

7.

Prepare infusion site(s)

Select an area on your abdomen, thigh, upper arm, or side of upper leg/hip for the infusion (Figure 13).The number and location of infusion sites depends on the volume of the total dose.
Figure 13
Never infuse into areas where the skin is tender, bruised, red, or hard. Avoid infusing into scars or stretch marks.
Infuse HIZENTRA into a maximum of 8 sites simultaneously; or up to 12 consecutively per infusion. Infusion sites should be at least 2 inches apart.
Clean the skin at each infusion site with an antiseptic skin prep (Figure 14). Let the skin dry.
Figure 14

8.

Insert needle(s)

Use just one needle per site. If injecting in more than one site, the following steps should be completed for each needle, one at a time:
Remove the needle cap.
Using 2 fingers, pinch together the skin around the infusion site. With a quick dart-like motion, insert the needle straight into the skin (Figure 15).
Figure 15
Put sterile gauze and tape or a transparent dressing over the infusion site (Figure 16) to hold the needle in place.
Figure 16

9.

Start infusion

Follow the manufacturer's instructions to turn on the infusion pump and start the infusion (Figure 17).
Figure 17

10.

Complete infusion and record treatment (Figure 18)

When all the HIZENTRA has been infused, turn off the infusion pump.
Remove the needle(s) from the skin.
Once you have removed the needle(s), remove the empty syringe from the infusion pump.
Disconnect the infusion set from the empty syringe.
Cover the infusion site(s) with a protective dressing.
Peel-off the removable part of the label for each prefilled syringe or vial used Affix it to the patient's log book with the date and time of infusion, or scan the prefilled syringe or vial if recording the infusion electronically.
Figure 18

11.

Clean up

If applicable, remove adapter from the infusion pump following the manufacturer's instructions.
Throw away the empty HIZENTRA prefilled syringe(s) or vial(s), along with the used disposable supplies in the sharps container (Figure 19) in accordance with local requirements.
Figure 19
Clean and store the infusion pump, following the manufacturer's instructions.

For self-administration, provide the patient with instructions and training for subcutaneous infusion in the home or other appropriate setting.

Pregnancy

Risk Summary

No human data are available to indicate the presence or absence of drug-associated risk. Animal reproduction studies have not been conducted with HIZENTRA. It is not known whether HIZENTRA can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. Immune globulins cross the placenta from maternal circulation increasingly after 30 weeks of gestation. HIZENTRA should be given to pregnant women only if clearly needed. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.

Lactation

Risk Summary

No human data are available to indicate the presence or absence of drug-associated risk. The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for HIZENTRA and any potential adverse effects on the breastfed infant from HIZENTRA or from the underlying maternal condition.

Pediatric Use

Treatment of Primary Immunodeficiency

Clinical Studies (Weekly Dosing)

The safety and effectiveness of weekly HIZENTRA have been established in the pediatric age groups 2 to 16. HIZENTRA was evaluated in 10 pediatric subjects with PI (3 children and 7 adolescents) in a study conducted in the U.S. [see Clinical Studies (14)] and in 23 pediatric subjects with PI (18 children and 5 adolescents) in Europe. There were no differences in the pharmacokinetics, safety and efficacy profiles as compared with adult subjects. No pediatric-specific dose requirements were necessary to achieve the desired serum IgG levels.

Pharmacokinetic Modeling and Simulation (Biweekly or more Frequent Dosing)

The biweekly (every 2 weeks) or more frequent dosing (2 to 7 times per week) regimens, developed from population PK-based modeling and simulation, included 57 pediatric subjects (32 from HIZENTRA clinical studies) [see Clinical Pharmacology (12.3)]. HIZENTRA dosing is adjusted to body weight. No pediatric-specific dose requirements are necessary for these regimens.

Safety and effectiveness of HIZENTRA in pediatric patients below the age of 2 have not been established.

Treatment of Chronic Inflammatory Demyelinating Polyneuropathy

The safety and effectiveness of HIZENTRA have not been established in patients with CIDP who are under the age of 18.

Geriatric Use

Treatment of Primary Immunodeficiency

Of the 49 subjects evaluated in the U.S. clinical study of HIZENTRA, 6 subjects were 65 years of age or older. No overall differences in safety or efficacy were observed between these subjects and subjects 18 to 65 years of age. The clinical study of HIZENTRA in Europe did not include subjects over the age of 65.

Treatment of Chronic Inflammatory Demyelinating Polyneuropathy

Of the 172 subjects evaluated in the SC treatment period of a global study (HIZENTRA vs placebo), 50 subjects were >65 years of age (34 HIZENTRA and 16 placebo subjects). No overall differences in safety or efficacy were observed between these subjects and subjects 18 to 65 years of age.

HIZENTRA is contraindicated in patients with:

History of anaphylactic or severe systemic reaction to human immune globulin or inactive ingredients of HIZENTRA, such as polysorbate 80.
Hyperprolinemia Type I or II because it contains L-proline as a stabilizer [see Description (11)].
IgA-deficiency with antibodies against IgA and a history of hypersensitivity [see Description (11)].

Hypersensitivity

Severe hypersensitivity reactions may occur to human immune globulin or components of HIZENTRA, such as polysorbate 80. If a hypersensitivity reaction occurs, discontinue the HIZENTRA infusion immediately and institute appropriate treatment.

Individuals with IgA deficiency can develop anti-IgA antibodies and anaphylactic reactions (including anaphylaxis and shock) after administration of blood components containing IgA. Patients with known antibodies to IgA may have a greater risk of developing potentially severe hypersensitivity and anaphylactic reactions with administration of HIZENTRA. HIZENTRA contains ≤50 mcg/mL IgA [see Description (11)].

Thrombosis

Thrombosis may occur following treatment with immune globulin products1-3, including HIZENTRA. Risk factors may include: advanced age, prolonged immobilization, hypercoagulable conditions, history of venous or arterial thrombosis, use of estrogens, indwelling central vascular catheters, hyperviscosity, and cardiovascular risk factors. Thrombosis may occur in the absence of known risk factors.

Consider baseline assessment of blood viscosity in patients at risk for hyperviscosity, including those with cryoglobulins, fasting chylomicronemia/markedly high triglycerides, or monoclonal gammopathies. For patients at risk of thrombosis, administer HIZENTRA at the minimum dose and infusion rate practicable. Ensure adequate hydration in patients before administration. Monitor for signs and symptoms of thrombosis and assess blood viscosity in patients at risk for hyperviscosity [see Boxed Warning, Dosage and Administration (2) and Patient Counseling Information (17)].

Aseptic Meningitis Syndrome (AMS)

AMS has been reported with use of IGIV4 or IGSC, including HIZENTRA. The syndrome usually begins within several hours to 2 days following immune globulin treatment. AMS is characterized by the following signs and symptoms: severe headache, nuchal rigidity, drowsiness, fever, photophobia, painful eye movements, nausea, and vomiting. Cerebrospinal fluid (CSF) studies frequently show pleocytosis up to several thousand cells per cubic millimeter, predominantly from the granulocytic series, and elevated protein levels up to several hundred mg/dL. AMS may occur more frequently in association with high doses (≥2 g/kg) and/or rapid infusion of immune globulin product.

Patients exhibiting such signs and symptoms should receive a thorough neurological examination, including CSF studies, to rule out other causes of meningitis. Discontinuation of immune globulin treatment has resulted in remission of AMS within several days without sequelae.

Renal Dysfunction/Failure

Acute renal dysfunction/failure, acute tubular necrosis, proximal tubular nephropathy, osmotic nephrosis and death may occur with use of human immune globulin products, especially those containing sucrose.5 HIZENTRA does not contain sucrose. Ensure that patients are not volume depleted before administering HIZENTRA.

For patients judged to be at risk for developing renal dysfunction, including patients with any degree of pre-existing renal insufficiency, diabetes mellitus, age greater than 65, volume depletion, sepsis, paraproteinemia, or patients receiving known nephrotoxic drugs, monitor renal function and consider lower, more frequent dosing [see Dosage and Administration (2)].

Periodic monitoring of renal function and urine output is particularly important in patients judged to have a potential increased risk of developing acute renal failure.6 Assess renal function, including measurement of blood urea nitrogen (BUN) and serum creatinine, before the initial infusion of HIZENTRA and at appropriate intervals thereafter. If renal function deteriorates, consider discontinuing HIZENTRA.

Hemolysis

HIZENTRA can contain blood group antibodies that may act as hemolysins and induce in vivo coating of red blood cells (RBCs) with immunoglobulin, causing a positive direct antiglobulin (Coombs') test result and hemolysis.7,9 Delayed hemolytic anemia can develop subsequent to immune globulin therapy due to enhanced RBC sequestration, and acute hemolysis, consistent with intravascular hemolysis, has been reported.10

Monitor recipients of HIZENTRA for clinical signs and symptoms of hemolysis. If signs and/or symptoms of hemolysis are present after HIZENTRA infusion, perform appropriate confirmatory laboratory testing.

Transfusion-Related Acute Lung Injury (TRALI)

Noncardiogenic pulmonary edema may occur in patients administered human immune globulin products.11 TRALI is characterized by severe respiratory distress, pulmonary edema, hypoxemia, normal left ventricular function, and fever. Typically, it occurs within 1 to 6 hours following transfusion. Patients with TRALI may be managed using oxygen therapy with adequate ventilatory support.

Monitor HIZENTRA recipients for pulmonary adverse reactions. If TRALI is suspected, perform appropriate tests for the presence of anti-neutrophil antibodies in both the product and patient's serum.

Transmissible Infectious Agents

Because HIZENTRA is made from human blood, it may carry a risk of transmitting infectious agents, e.g., viruses, the variant Creutzfeldt-Jakob disease (vCJD) agent and, theoretically, the Creutzfeldt-Jakob disease (CJD) agent. This also applies to unknown or emerging viruses and other pathogens. No cases of transmission of viral diseases or CJD have been associated with the use of HIZENTRA. All infections suspected by a physician possibly to have been transmitted by HIZENTRA should be reported to CSL Behring Pharmacovigilance at 1-866-915-6958.

Laboratory Tests

Various passively transferred antibodies in immunoglobulin preparations may lead to misinterpretation of the results of serological testing.

The most common adverse reactions (ARs) observed in ≥5% of study subjects receiving HIZENTRA were local reactions (e.g., swelling, redness, heat, pain, hematoma and itching at the infusion site), headache, diarrhea, fatigue, back pain, nausea, pain in extremity, cough, upper respiratory tract infection, rash, pruritus, vomiting, abdominal pain (upper), migraine, arthralgia, pain, fall and nasopharyngitis.

Clinical Trials Experience

Because clinical studies are conducted under widely varying conditions, AR rates observed in clinical studies of a product cannot be directly compared to rates in the clinical studies of another product and may not reflect the rates observed in clinical practice.

Treatment of Primary Immunodeficiency (PI)

PI U.S. Study

The safety of HIZENTRA was evaluated in a clinical study in the U.S. for 15 months (3-month wash-in/wash-out period followed by a 12-month efficacy period) in subjects with PI who had been treated previously with IGIV every 3 or 4 weeks. The safety analyses included 49 subjects in the intention-to-treat (ITT) population. The ITT population consisted of all subjects who received at least one dose of HIZENTRA [see Clinical Studies (14)].

Subjects were treated with HIZENTRA at weekly median doses ranging from 66 to 331 mg/kg body weight (mean: 181.4 mg/kg) during the wash-in/wash-out period and from 72 to 379 mg/kg (mean: 213.2 mg/kg) during the efficacy period. The 49 subjects received a total of 2264 weekly infusions of HIZENTRA.

Table 2 summarizes the most frequent adverse reactions (ARs) (experienced by at least 2 subjects) occurring during or within 72 hours after the end of an infusion. Local reactions were assessed by the investigators 15 to 45 minutes post-infusion and by the subjects 24 hours post-infusion. The investigators then evaluated the ARs arising from the subject assessments. Local reactions were the most frequent ARs observed, with infusion-site reactions (e.g., swelling, redness, heat, pain, and itching at the site of infusion) comprising 98% of local reactions.

Table 2. Incidence of Subjects with Adverse Reactions (ARs) * (Experienced by 2 or More Subjects) and Rate per Infusion (ITT Population), PI U.S. Study
	ARs * Occurring During or Within 72 Hours of Infusion
AR (≥2 Subjects)	Number (%) of Subjects (n=49)	Number (Rate †) of ARs (n=2264 Infusions)
* Excluding infections. † Rate of ARs per infusion. ‡ Includes infusion-site reactions as well as bruising, scabbing, pain, irritation, cysts, eczema, and nodules at the infusion site.
Local reactions ‡	49 (100)	1322 (0.584)
Other ARs:
Headache	12 (24.5)	32 (0.014)
Diarrhea	5 (10.2)	6 (0.003)
Fatigue	4 (8.2)	4 (0.002)
Back pain	4 (8.2)	5 (0.002)
Nausea	4 (8.2)	4 (0.002)
Pain in extremity	4 (8.2)	6 (0.003)
Cough	4 (8.2)	4 (0.002)
Vomiting	3 (6.1)	3 (0.001)
Abdominal pain, upper	3 (6.1)	3 (0.001)
Migraine	3 (6.1)	4 (0.002)
Pain	3 (6.1)	4 (0.002)
Arthralgia	2 (4.1)	3 (0.001)
Contusion	2 (4.1)	3 (0.001)
Rash	2 (4.1)	3 (0.001)
Urticaria	2 (4.1)	2 (<0.001)

The ratio of infusions with ARs, including local reactions, to all infusions was 1303 to 2264 (57.6%). Excluding local reactions, the corresponding ratio was 56 to 2264 (2.5%).

Table 3 summarizes infusion-site reactions based on investigator assessments 15 to 45 minutes after the end of the 683 infusions administered during regularly scheduled visits (every 4 weeks).

Table 3. Investigator Assessment * of Infusion-Site Reactions by Infusion, PI U.S. Study
Infusion-Site Reaction	Number † (Rate ‡) of Reactions (n=683 Infusions §)
* 15 to 45 minutes following infusions administered at regularly scheduled visits (every 4 weeks). † For multiple infusion sites, every site was judged, but only the site with the strongest reaction was recorded. ‡ Rate of infusion-site reactions per infusion. § Number of infusions administered during regularly scheduled visits.
Edema/induration	467 (0.68)
Erythema	346 (0.51)
Local heat	108 (0.16)
Local pain	88 (0.13)
Itching	64 (0.09)

Most local reactions were either mild (does not interfere with routine activities [93.4%]) or moderate (interferes somewhat with routine activities and may have warranted intervention [6.3%]) in intensity.

No deaths or serious ARs occurred during the study. Two subjects withdrew from the study due to ARs. One subject experienced a severe infusion-site reaction one day after the third weekly infusion, and the other subject experienced moderate myositis.

PI European Study

In a clinical study conducted in Europe, the safety of HIZENTRA was evaluated for 10 months (3-month wash-in/wash-out period followed by a 7-month efficacy period) in 51 subjects with PI who had been treated previously with IGIV every 3 or 4 weeks or with IGSC weekly.

Subjects were treated with HIZENTRA at weekly median doses ranging from 59 to 267 mg/kg body weight (mean: 118.8 mg/kg) during the wash-in/wash-out period and from 59 to 243 mg/kg (mean: 120.1 mg/kg) during the efficacy period. The 51 subjects received a total of 1831 weekly infusions of HIZENTRA.

Table 4 summarizes the most frequent ARs (experienced by at least 2 subjects) occurring during or within 72 hours after the end of an infusion. Local reactions were assessed by the subjects between 24 and 72 hours post-infusion. The investigators then evaluated the ARs arising from the subject assessments.

Table 4. Incidence of Subjects with Adverse Reactions (ARs) * (Experienced by 2 or More Subjects) and Rate per Infusion, PI European Study
	ARs * Occurring During or Within 72 Hours of Infusion
AR (≥2 Subjects)	Number (%) of Subjects (n=51)	Number (Rate †) of ARs (n=1831 Infusions)
* Excluding infections. † Rate of ARs per infusion. ‡ Includes infusion-related reaction; infusion-site mass; infusion/injection-site erythema, hematoma, induration, inflammation, edema, pain, pruritus, rash, reaction, swelling; infusion-site extravasation, nodule; puncture-site reaction.
Local reactions ‡	24 (47.1)	105 (0.057)
Other ARs:
Headache	9 (17.6)	20 (0.011)
Rash	4 (7.8)	4 (0.002)
Pruritus	4 (7.8)	13 (0.007)
Fatigue	3 (5.9)	5 (0.003)
Abdominal pain, upper	2 (3.9)	3 (0.002)
Arthralgia	2 (3.9)	2 (0.001)
Erythema	2 (3.9)	4 (0.002)
Abdominal discomfort	2 (3.9)	3 (0.002)
Back pain	2 (3.9)	2 (0.001)
Hematoma	2 (3.9)	3 (0.002)
Hypersensitivity	2 (3.9)	4 (0.002)

The proportion of subjects reporting local reactions decreased over time from approximately 20% following the first infusion to <5% by the end of the study.

Three subjects withdrew from the study due to ARs of mild to moderate intensity. One subject experienced infusion-site pain and infusion-site pruritus; the second subject experienced infusion-site reaction, fatigue, and feeling cold; and the third subject experienced infusion-site reaction and hypersensitivity.

Biweekly (Every 2 Weeks) or Frequent (2 To 7 Times per Week) Dosing

No data regarding ARs are available for these alternative HIZENTRA dosing regimens because no clinical trials using these regimens were conducted.

Treatment of Chronic Inflammatory Demyelinating Polyneuropathy (CIDP)

PATH Study

The safety of 2 doses of HIZENTRA (0.2 g/kg body weight or 0.4 g/kg body weight) versus placebo was evaluated in the 24-week subcutaneous (SC) treatment period of the PATH (Polyneuropathy AND Treatment with Hizentra) study in subjects with CIDP who had been treated previously with IGIV [see Clinical Studies (14.2)]. The dose was administered once a week in 2 infusion sessions conducted on 1 or 2 consecutive day(s). The safety population included 172 subjects.

Table 5 summarizes the most frequent ARs that occurred in ≥5% of subjects treated with HIZENTRA and at a higher frequency than placebo. The overall AR rates were similar in the 0.2 g/kg body weight and 0.4 g/kg body weight HIZENTRA dose groups (50.9% and 46.6%, respectively) and higher than placebo (33.3%). The most frequent ARs were local infusion site reactions. Local reactions were more frequent among subjects who received the 0.4 g/kg body weight dose than among subjects who received the 0.2 g/kg body weight dose (29.3% and 19.3%, respectively). The exposure-adjusted rate of local reactions per subject remained greater in the 0.4 g/kg body weight dose group compared to the 0.2 g/kg body weight dose group after adjusting for the greater mean duration of exposure to HIZENTRA in the 0.4 g/kg body weight dose group (129 days) compared to that of the 0.2 g/kg body weight dose group (119 days). All local reactions were either mild (does not interfere with routine activities [94.5%]) or moderate (interferes somewhat with routine activities and may have warranted intervention [5.5%]) in intensity and the frequency tended to decrease over time. No subject withdrew because of local reaction.

One serious AR, allergic dermatitis was reported in the 0.2 g/kg body weight HIZENTRA group which started at SC Week 9 and lasted 15 days. One subject withdrew from the study due to a non-serious AR, fatigue.

Table 5. CIDP SC Treatment Period – ARs Occurring in ≥5% of Subjects Treated with HIZENTRA and at a Higher Frequency than Placebo-Treated Subjects
	Placebo		0.2 g/kg HIZENTRA		0.4 g/kg HIZENTRA
	Number (%) of Subjects n=57	Number of Events (Rate/Infusion) n=1514 *	Number (%) of Subjects n=57	Number of Events (Rate/Infusion) n=2007 *	Number (%) of Subjects n=58	Number of Events (Rate/Infusion) n=2218 *
AR = adverse reaction; SC = subcutaneous.
* Number of infusions. † Includes infusion site erythema, infusion site swelling, infusion site pain, infusion site induration, infusion site warmth, infusion site hematoma, and infusion site pruritus.
Local Reactions †	4 (7.0)	7 (0.005)	11 (19.3)	54 (0.027)	17 (29.3)	49 (0.022)
Headache	2 (3.5)	2 (0.001)	4 (7.0)	5 (0.002)	4 (6.9)	4 (0.002)
Nasopharyngitis	1 (1.8)	1 (<0.001)	4 (7.0)	6 (0.003)	2 (3.4)	2 (<0.001)
Fatigue	1 (1.8)	1 (<0.001)	5 (8.8)	5 (0.002)	0	0
Upper respiratory tract infection	2 (3.5)	2 (0.001)	3 (5.3)	3 (0.001)	2 (3.4)	2 (<0.001)
Fall	0	0	3 (5.3)	8 (0.004)	1 (1.7)	1 (<0.001)
Back Pain	1 (1.8)	1 (<0.001)	3 (5.3)	4 (0.002)	1 (1.7)	1 (<0.001)
Arthralgia	1 (1.8)	1 (<0.001)	3 (5.3)	4 (0.002)	1 (1.7)	1 (<0.001)
Pain in Extremity	0	0	1 (1.8)	1 (<0.001)	3 (5.2)	3 (0.001)

Hypertension was reported in 2 subjects (3.5%) in the 0.2 g/kg HIZENTRA group, 2 subjects (3.4%) in the 0.4 g/kg group, and zero subjects in the placebo group. Systemic adverse reactions in the 13-week IGIV Restabilization Period of the study for subjects also randomized and treated with HIZENTRA during the 24-week subcutaneous treatment period (N=115) occurred at a rate of 0.098 (956 infusions) relative to a rate of 0.027 (4225 infusions) during treatment with HIZENTRA in the IGSC period of the study. The systemic adverse reaction rate per infusion for HIZENTRA was 3.6-fold lower than the corresponding rate for IGIV.

The exposure-adjusted rate for systemic adverse reactions in the 13-week single-arm IGIV Restabilization Period of the study for subjects also randomized and treated with HIZENTRA during the 24-week subcutaneous treatment period (N=115) was 0.075 reactions per week, relative to an exposure-adjusted rate of 0.052 reactions per week during treatment with HIZENTRA in the IGSC period of the study. The exposure-adjusted systemic adverse reaction rate for HIZENTRA was 31% lower than the corresponding rate for IGIV. However, this difference should be interpreted with caution, because there was no parallel group of subjects receiving placebo during the period of IGIV treatment.

PATH Extension Study

The PATH Extension study was a multicenter, 48-week, open-label extension study that evaluated the long -term safety and efficacy of HIZENTRA 0.2 g/kg and 0.4 g/kg doses, per body weight, in the maintenance treatment of CIDP in subjects who either completed or were being successfully rescued from CIDP relapse with IGIV in the PATH study. A total of 82 subjects were enrolled. Of these, 66 (80.5%) subjects completed the study, and 16 (19.5%) subjects discontinued.

In the study, 30.1% of subjects in the HIZENTRA 0.2 g/kg group and 51.4% of subjects in the 0.4 g/kg group experienced adverse reactions. Similar to the PATH study, the most frequent ARs were local infusion site reactions, and local reactions were more frequent among subjects who received the 0.4 g/kg body weight dose than among subjects who received the 0.2 g/kg body weight dose (18.1% and 9.6%, respectively). Of all the local reactions, 1 subject had 3 severe reactions (interrupts routine activities or may require intensive therapeutic intervention [7.5%]) with the 0.4 g/kg dose; the rest were either mild (85.0%) or moderate (7.5%). Two subjects withdrew because of local reactions.

The total exposure was 25.1 subject years in the HIZENTRA 0.2 g/kg group and 38.7 subject years in the 0.4 g/kg group. The mean duration of exposure was 125.8 (range 1 to 330) days in the HIZENTRA 0.2 g/kg group and 196.1 (range 1 to 330) days in the 0.4 g/kg group.

Postmarketing Experience

Because postmarketing reporting of adverse reactions is voluntary and from a population of uncertain size, it is not always possible to reliably estimate the frequency of these reactions or establish a causal relationship to product exposure.

HIZENTRA

The following adverse reactions have been identified during postmarketing use of HIZENTRA. This list does not include reactions already reported in clinical studies with HIZENTRA [see Adverse Reactions (6.1)].

Infusion reactions: Allergic-anaphylactic reactions such as swollen face or tongue and pharyngeal edema, pyrexia, chills, dizziness, hypertension/changes in blood pressure, malaise, tachycardia, flushing.
Cardiovascular: Chest discomfort (including chest pain)
Respiratory: Dyspnea
Neurological: Tremor, burning sensation
General disorders and administration site conditions: Infusion site ulcer, infusion site necrosis

Immune Globulin Products

The following adverse reactions have been reported during postmarketing use of immune globulin products:5

Infusion reactions: Wheezing, rigors, myalgia
Renal: Osmotic nephropathy
Respiratory: Apnea, Acute Respiratory Distress Syndrome (ARDS), cyanosis, hypoxemia, pulmonary edema, bronchospasm
Cardiovascular: Cardiac arrest, vascular collapse, hypotension
Neurological: Coma, loss of consciousness, seizures, aseptic meningitis syndrome
Integumentary: Stevens-Johnson syndrome, epidermolysis, erythema multiforme, dermatitis (e.g., bullous dermatitis)
Hematologic: Pancytopenia, leukopenia, hemolysis, positive direct antiglobulin (Coombs') test
Gastrointestinal: Hepatic dysfunction

To report SUSPECTED ADVERSE REACTIONS, contact CSL Behring Pharmacovigilance at 1-866-915-6958 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Live Virus Vaccines

The passive transfer of antibodies with immunoglobulin administration may interfere with the response to live virus vaccines such as measles, mumps, rubella, and varicella [see Patient Counseling Information (17)].

Serological Testing

Various passively transferred antibodies in immunoglobulin preparations may lead to misinterpretation of the results of serological testing.

HIZENTRA, Immune Globulin Subcutaneous (Human), 20% Liquid, is a ready-to-use, sterile 20% (0.2 g/mL) protein liquid preparation of polyvalent human immunoglobulin G (IgG) for subcutaneous administration. HIZENTRA is manufactured from large pools of human plasma by a combination of cold alcohol fractionation, octanoic acid fractionation, and anion exchange chromatography. The IgG proteins are not subjected to heating or to chemical or enzymatic modification. The Fc and Fab functions of the IgG molecule are retained. Fab functions tested include antigen binding capacities, and Fc functions tested include complement activation and Fc-receptor-mediated leukocyte activation (determined with complexed IgG). The IgG subclass distribution is similar to that of normal human plasma.

HIZENTRA has a purity of ≥98% IgG and a pH of 4.6 to 5.2. This product contains approximately 250 mmol/L (range: 210 to 290 mmol/L) L-proline (a nonessential amino acid) as a stabilizer, 8 to 30 mg/L polysorbate 80, and trace amounts of sodium. HIZENTRA contains ≤50 mcg/mL IgA, no carbohydrate stabilizers (e.g., sucrose, maltose) and no preservative.

Plasma units used in the manufacture of HIZENTRA are tested using FDA-licensed serological assays for hepatitis B surface antigen and antibodies to human immunodeficiency virus (HIV)-1/2 and hepatitis C virus (HCV) as well as FDA-licensed Nucleic Acid Testing (NAT) for HBV, HCV and HIV-1. All plasma units have been found to be nonreactive (negative) in these tests. In addition, the plasma has been tested for B19 virus (B19V) DNA by NAT. Only plasma that passes virus screening is used for production, and the limit for B19V in the fractionation pool is set not to exceed 104 IU of B19V DNA per mL.

The manufacturing process for HIZENTRA includes three steps to reduce the risk of virus transmission. Two of these are dedicated virus clearance steps: pH 4 incubation to inactivate enveloped viruses, and virus filtration to remove, by size exclusion, both enveloped and non-enveloped viruses as small as approximately 20 nanometers. In addition, a depth filtration step contributes to the virus reduction capacity.12

These steps have been independently validated in a series of in vitro experiments for their capacity to inactivate and/or remove both enveloped and non-enveloped viruses. Table 6 shows the virus clearance during the manufacturing process for HIZENTRA, expressed as the mean log10 reduction factor (LRF).

Table 6. Virus Inactivation/Removal in HIZENTRA *
	HIV-1	PRV	BVDV	WNV	EMCV	MVM
HIV-1, human immunodeficiency virus type 1, a model for HIV-1 and HIV-2; PRV, pseudorabies virus, a nonspecific model for large enveloped DNA viruses (e.g., herpes virus); BVDV, bovine viral diarrhea virus, a model for hepatitis C virus; WNV, West Nile virus; EMCV, encephalomyocarditis virus, a model for hepatitis A virus; MVM, minute virus of mice, a model for a small highly resistant non-enveloped DNA virus (e.g., parvovirus); LRF, log10 reduction factor; nt, not tested; na, not applicable.
* The virus clearance of human parvovirus B19 was investigated experimentally at the pH 4 incubation step. The estimated LRF obtained was ≥5.6.
Virus Property
Genome	RNA	DNA	RNA	RNA	RNA	DNA
Envelope	Yes	Yes	Yes	Yes	No	No
Size (nm)	80-100	120-200	50-70	50-70	25-30	18-24
Manufacturing Step	Mean LRF
pH 4 incubation	≥5.6	≥6.1	4.6	≥7.8	nt	nt
Depth filtration	≥6.7	≥5.7	3.5±0.2	3.0±0.4	5.7±0.2	3.7±0.3
Virus filtration	≥4.7	≥5.8	≥4.6	≥6.8	≥6.3	≥6.5
Overall Reduction (Log10 Units)	≥17.0	≥17.6	≥12.7	≥17.6	≥12.0	≥10.2

Mechanism of Action

HIZENTRA supplies a broad spectrum of opsonizing and neutralizing IgG antibodies against a wide variety of bacterial and viral agents. The mechanism of action has not been fully elucidated, but may include immunomodulatory effects.

Pharmacokinetics

Treatment of Primary Immunodeficiency

Clinical Studies

The pharmacokinetics (PK) of HIZENTRA was evaluated in a PK substudy of subjects (14 adults, 1 pediatric subject aged 6 to <12 years, and 3 adolescent subjects aged 12 to <16 years) with PI participating in the 15-month efficacy and safety study [see Clinical Studies (14)]. All PK subjects were treated previously with PRIVIGEN®, Immune Globulin Intravenous (Human), 10% Liquid and were switched to weekly subcutaneous treatment with HIZENTRA. After a 3-month wash-in/wash-out period, doses were adjusted individually with the goal of providing a systemic serum IgG exposure (area under the IgG serum concentration vs time curve; AUC) not inferior to that of the previous weekly-equivalent IGIV dose. Table 7 summarizes PK parameters for subjects in the substudy following treatment with HIZENTRA and IGIV.

Table 7. Pharmacokinetics Parameters of HIZENTRA and IGIV, PI U.S. Study
	HIZENTRA	IGIV * (PRIVIGEN®)
AUC, area under the curve; CL, clearance.
* For IGIV: weekly-equivalent dose. † Standardized to a 7-day period. ‡ Apparent clearance (CL/F) for HIZENTRA (F = bioavailability) § Based on n=25 from the U.S. PRIVIGEN PI study.
Number of subjects	18	18
Dose * (mg/kg)
Mean	228	152
Range	141-381	86-254
IgG peak levels (mg/dL)
Mean	1616	2564
Range	1090-2825	2046-3456
IgG trough levels (mg/dL)
Mean	1448	1127
Range	952-2623	702-1810
AUC † (day × mg/dL)
Mean	10560	10320
Range	7210-18670	8051-15530
CL ‡ (mL/day/kg)
Mean	2.2	1.3 §
Range	1.2-3.7	0.9-2.1

For the 19 subjects completing the wash-in/wash-out period, the average dose adjustment for HIZENTRA was 153% (range: 126% to 187%) of the previous weekly-equivalent IGIV dose. After 12 weeks of treatment with HIZENTRA at this individually adjusted dose, the final steady-state AUC determinations were made in 18 of the 19 subjects. The geometric mean ratio of the steady-state AUCs, standardized to a weekly treatment period, for HIZENTRA vs IGIV treatment was 1.002 (range: 0.77 to 1.20) with a 90% confidence limit of 0.951 to 1.055 for the 18 subjects.

With HIZENTRA, peak serum levels are lower (1616 vs 2564 mg/dL) than those achieved with IGIV while trough levels are generally higher (1448 vs 1127 mg/dL). In contrast to IGIV administered every 3 to 4 weeks, weekly subcutaneous administration results in relatively stable steady-state serum IgG levels.13,14 After the subjects had reached steady-state with weekly administration of HIZENTRA, peak serum IgG levels were observed after a mean of 2.9 days (range: 0 to 7 days) in 18 subjects.

Table 8 summarizes PK parameters at steady state for pediatric subjects (age groups: 6 to <12 years and 12 to <16 years) and adult subjects (≥16 years) in the European HIZENTRA study following weekly treatment [see Clinical Studies (14.1)]. Pediatric PK parameters are similar to those of adult subjects; thus no pediatric specific dose requirements are needed for HIZENTRA dosing.

Table 8. Pediatric Pharmacokinetics Parameters of HIZENTRA, PI European Study
	Age Group	Age Group	Age Group
	6 to <12 years (n=9)	12 to <16 years (n=3)	16 to <65 years (n=11)	Total (n=23)
AUC0-7d, area under the curve for the 7-day dosing interval; CL, apparent clearance (CL/F) (F = bioavailability).
Dose (mg/kg)
Mean	120	115	117	118
Range	71-170	72-150	87-156	71-170
IgG trough levels (mg/dL)
Mean	731	764	754	746
Range	531-915	615-957	505-898	505-957
AUC0-7d (day × mg/dL)
Mean	5230	5491	5452	5370
Range	3890-6950	4480-6750	3860-6810	3860-6950
CL (mL/day/kg)
Mean	2.19	2.17	2.30	2.23
Range	1.57-3.05	1.38-3.34	1.82-3.01	1.38-3.34

Pharmacokinetic Modeling and Simulation

Biweekly (Every 2 Weeks) or more Frequent Dosing

Pharmacokinetic characterization of biweekly or more frequent dosing of HIZENTRA was undertaken using population PK-based modeling and simulation. Serum IgG concentration data consisted of 3837 samples from 151 unique pediatric and adult subjects with PI from four clinical studies of IGIV (PRIVIGEN®) and/or HIZENTRA. Of the 151 subjects, 94 were adult subjects (63 from HIZENTRA clinical studies) and 57 were pediatric subjects (32 from HIZENTRA clinical studies). Compared with weekly administration, PK modeling and simulation predicted that administration of HIZENTRA on a biweekly basis at double the weekly dose results in comparable IgG exposure [equivalent AUCs, with a slightly higher IgG peak (Cmax) and slightly lower trough (Cmin)]. In addition, PK modeling and simulation predicted that for the same total weekly dose, HIZENTRA infusions given 2, 3, 5, or 7 times per week (frequent dosing) produce IgG exposures comparable to weekly dosing [equivalent AUCs, with a slightly lower IgG peak (Cmax) and slightly higher trough (Cmin)]. Frequent dosing reduces the peak-to-trough variation in HIZENTRA serum levels, thus resulting in more sustained IgG exposures. See Table 9 (columns for AUC, Cmax and Cmin).

Dose Adjustment Factor

Using data from four clinical studies, results of model-based simulations demonstrated that weekly or biweekly HIZENTRA dosing regimens with an IGIV:IGSC dose adjustment factor of 1:1.37 adequately maintain median AUC0-28days and Cmin ratios at ≥90% of values observed with 4-weekly IGIV dosing. See Table 9 (top two rows).

Prediction of Trough Levels Following Regimen Changes

PK modeling and simulation also predicted changes in trough levels after switching from (a) monthly IGIV to weekly or biweekly HIZENTRA dosing, (b) weekly to biweekly HIZENTRA dosing, or (c) weekly to more frequent dosing. Table 9 (last column) shows the predicted changes in steady-state IgG trough levels after switching between the various dosing regimens.

Table 9. Predicted Ratios * [Median (5th, 95th percentiles)] of AUC, Cmax and Cmin and Changes in IgG Trough Levels after Switching Between IgG Dosing Regimens for Primary Humoral Immune Deficiency
IgG Dosing Regimen Switch		AUC	Cmax	Cmin	Predicted Change in Trough †
From:	To:	AUC	Cmax	Cmin	Predicted Change in Trough †
AUC, area under the curve, calculated as AUC0-28days for the IGIV to HIZENTRA switches, AUC0-14days for the weekly to biweekly HIZENTRA switch, and AUC0-7days for weekly to more frequent HIZENTRA switches; Cmax, maximum IgG concentration; Cmin, minimum IgG concentration during a 28-day period (for the IGIV to HIZENTRA switches), a 14-day period (for the weekly to biweekly HIZENTRA switch), or a 7-day period (for the weekly to more frequent HIZENTRA switches).
* Ratios are based on comparison of second regimen vs. first regimen. † Approximate change in trough based on predicted median Cmin ratio. ‡ Weekly dose based on dose adjustment factor of 1.37 when switching from IGIV. § Biweekly dose = 2× weekly dose, based on dose adjustment factor of 1.37 when switching from IGIV.
IGIV	Weekly HIZENTRA ‡	0.97 (0.90, 1.04)	0.68 (0.60, 0.76)	1.16 (1.07, 1.26)	16% increase
IGIV	Biweekly HIZENTRA §	0.97 (0.91, 1.04)	0.71 (0.63, 0.78)	1.10 (1.02, 1.18)	10% increase
Weekly HIZENTRA	Biweekly HIZENTRA §	1.00 (0.98, 1.03)	1.06 (1.02, 1.09)	0.95 (0.92, 0.98)	5% decrease
Weekly HIZENTRA	2 times per week HIZENTRA	1.01 (0.98, 1.03)	0.99 (0.96, 1.02)	1.03 (1.00, 1.06)	3% increase
Weekly HIZENTRA	3 times per week HIZENTRA	1.01 (0.98, 1.03)	0.99 (0.96, 1.02)	1.04 (1.01, 1.07)	4% increase
Weekly HIZENTRA	5 times per week HIZENTRA (daily for 5 days)	1.01 (0.98, 1.03)	0.99 (0.97, 1.01)	1.04 (1.01, 1.06)	4% increase
Weekly HIZENTRA	Daily HIZENTRA (7 times per week)	1.00 (0.98, 1.03)	0.98 (0.95, 1.01)	1.04 (1.02, 1.08)	4% increase

PI Pediatric Pharmacokinetics

PK-based modeling and simulation results indicate that, similar to observations from the clinical study with weekly HIZENTRA dosing (Table 8), body weight-adjusted biweekly dosing accounted for age-related (>3 years) differences in clearance of HIZENTRA, thereby maintaining systemic IgG exposure (AUC values) in the therapeutic range.

Treatment of Chronic Inflammatory Demyelinating Polyneuropathy

PATH Study

In the PATH study, subjects (n=172) achieved sustained trough levels over a period of 24 weeks when receiving weekly doses of 0.2 g/kg body weight and 0.4 g/kg body weight, respectively. The mean (SD) IgG trough concentration after 24 weeks of HIZENTRA treatment in the 0.2 g/kg body weight group was 15.3 (2.57) g/L and in the 0.4 g/kg body weight group was 20.8 (3.23) g/L.

PATH Extension Study

A total of 82 subjects were enrolled in the PATH Extension study. The mean serum IgG concentration remained stable at approximately 20 g/L until Week 33, after this period it decreased to 17.1 g/L. The Week 33 decrease in IgG level matched the level in subjects being down titrated from 0.4 g/kg to 0.2 g/kg at Week 25. The mean IgG level decreased by 19% from enrollment into the extension study for subjects who remained stable after down-titrating to 0.2 g/kg versus the 0.4 g/kg dosing. The mean IgG level decreased by 27% from enrollment into the extension study for subjects who relapsed after down-titrating to 0.2 g/kg versus 0.4 g/kg dosing. The mean (SD) IgG level increased to 20.2 (3.59) g/L at the end of the study for subjects who relapsed on 0.2 g/kg and up-titrated to 0.4 g/kg dosing.

Carcinogenesis, Mutagenesis, Impairment of Fertility

No animal studies were conducted to evaluate the carcinogenic or mutagenic effects of HIZENTRA or its effects on fertility.

Animal Toxicology and/or Pharmacology

Long- and short-term memory loss was seen in juvenile rats in a study modeling hyperprolinemia. In this study, rats received daily subcutaneous injections with L-proline from day 6 to day 28 of life.15 The daily amounts of L-proline used in this study were more than 60 times higher than the L-proline dose that would result from the administration of 400 mg/kg body weight of HIZENTRA once weekly. In unpublished studies using the same animal model (i.e., rats) dosed with the same amount of L-proline with a dosing interval relevant to IGSC treatment (i.e., on 5 consecutive days on days 9 to 13, or once weekly on days 9, 16, and 23), no effects on learning and memory were observed. The clinical relevance of these studies is not known.

Primary Immunodeficiency (PI)

U.S. Study

A prospective, open-label, multicenter, single-arm, clinical study conducted in the U.S. evaluated the efficacy, tolerability, and safety of HIZENTRA in 49 adult and pediatric subjects with PI. Subjects previously receiving monthly treatment with IGIV were switched to weekly subcutaneous administration of HIZENTRA for 15 months. Following a 3-month wash-in/wash-out period, subjects received a dose adjustment to achieve an equivalent AUC to their previous IGIV dose [see Clinical Pharmacology (12.3)] and continued treatment for a 12-month efficacy period. The efficacy analyses included 38 subjects in the modified intention-to-treat (MITT) population. The MITT population consisted of subjects who completed the wash-in/wash-out period and received at least one infusion of HIZENTRA during the efficacy period.

Although 5% of the administered doses could not be verified, the weekly median doses of HIZENTRA ranged from 72 to 379 mg/kg body weight during the efficacy period. The mean dose was 213.2 mg/kg, which was 149% of the previous IGIV dose.

In the study, the number of infusion sites per infusion ranged from 1 to 12. In 73% of infusions, the number of infusion sites was 4 or fewer. Up to 4 simultaneous infusion sites were permitted using 2 pumps; however, more than 4 sites could be used consecutively during one infusion. The infusion flow rate did not exceed 50 mL per hour for all infusion sites combined. During the efficacy period, the median duration of a weekly infusion ranged from 1.6 to 2.0 hours.

The study evaluated the annual rate of serious bacterial infections (SBIs), defined as bacterial pneumonia, bacteremia/septicemia, osteomyelitis/septic arthritis, bacterial meningitis, and visceral abscess. The study also evaluated the annual rate of any infections, the use of antibiotics for infection (prophylaxis or treatment), the days out of work/school/kindergarten/day care or unable to perform normal activities due to infections, hospitalizations due to infections, and serum IgG trough levels.

Table 10 summarizes the efficacy results for subjects in the efficacy period (MITT population) of the study. No subjects experienced an SBI in this study.

Table 10. Summary of Efficacy Results (MITT Population)
* Defined as bacterial pneumonia, bacteremia/septicemia, osteomyelitis/septic arthritis, bacterial meningitis, and visceral abscess. † Upper 99% confidence limit: 0.132. ‡ 95% confidence limits: 2.235; 3.370. § Based on 1 subject.
Number of subjects (efficacy period)	38
Total number of subject days	12,697
Infections
Annual rate of SBIs *	0 SBIs per subject year †
Annual rate of any infections	2.76 infections/subject year ‡
Antibiotic use for infection (prophylaxis or treatment)
Number of subjects (%)	27 (71.1)
Annual rate	48.5 days/subject year
Total number of subject days	12,605
Days out of work/school/kindergarten/day care or unable to perform normal activities due to infections
Number of days (%)	71 (0.56)
Annual rate	2.06 days/subject year
Hospitalizations due to infections
Number of days (%)	7 (0.06) §
Annual rate	0.2 days/subject year

The mean IgG trough levels increased by 24.2%, from 1009 mg/dL prior to the study to 1253 mg/dL during the efficacy period.

European Study

In a prospective, open-label, multicenter, single-arm, clinical study conducted in Europe, 51 adult and pediatric subjects with PI switched from monthly IGIV (31 subjects) or weekly IGSC (20 subjects) to weekly treatment with HIZENTRA. For the 46 subjects in the efficacy analysis, the weekly mean dose in the efficacy period was 120.1 mg/kg (range 59 to 243 mg/kg), which was 104% of the previous weekly equivalent IGIV or weekly IGSC dose.

None of the subjects had an SBI during the efficacy period, resulting in an annualized rate of 0 (upper one-sided 99% confidence limit of 0.192) SBIs per subject. The annualized rate of any infections was 5.18 infections per subject for the efficacy period.

Chronic Inflammatory Demyelinating Polyneuropathy (CIDP)

PATH Study

A multicenter, double-blind, randomized, placebo-controlled, parallel-group phase 3 study evaluated the efficacy, safety, and tolerability of 2 different weekly doses of HIZENTRA (0.4 g/kg body weight and 0.2 g/kg body weight) versus placebo in 172 adult subjects with CIDP and previously treated with IGIV (PATH study). The mean treatment duration was 129 days in the 0.4 g/kg HIZENTRA group and 118.9 days in the 0.2 g/kg HIZENTRA group (treatment duration up to 166 and 167 days in each group, respectively). Subjects generally used 4 infusion sites in parallel (maximum: 8 sites in parallel). Subjects infused an average of 20 mL per infusion site (maximum: 50 mL/site) with an infusion rate of 20 mL/h (maximum: 50 mL/h) and volumes up to 140 mL per infusion session. The infusion time was approximately 1 hour.

The main endpoint was the percentage of subjects who had a CIDP relapse or were withdrawn for any other reason during the SC Treatment Period. CIDP relapse was defined as a ≥1 point increase in adjusted Inflammatory Neuropathy Cause and Treatment [INCAT] score compared with baseline. Both HIZENTRA doses demonstrated superiority over placebo for the main endpoint (32.8% for 0.4 g/kg HIZENTRA and 38.6% for 0.2 g/kg HIZENTRA compared with 63.2% for placebo, p<0.001 or p=0.007, respectively), with no statistically significant difference between the doses. When only considering relapse, the CIDP relapse rates were 19.0% for 0.4 g/kg HIZENTRA and 33.3% for 0.2 g/kg HIZENTRA compared with 56.1% for placebo (p<0.001 or p=0.012, respectively), with no statistically significant difference between the doses. Eighty one percent (81%) and 67% of HIZENTRA-treated subjects remained relapse-free (0.4 g/kg body weight and 0.2 g/kg body weight, respectively); 44% of placebo subjects remained relapse-free for up to 24 weeks.

A Kaplan-Meier Plot of time to CIDP relapse or withdrawal for any other reason is shown in Figure 1.

Figure 1. Kaplan-Meier Plot Time to CIDP Relapse or Withdrawal for Any Other Reason

Subjects in both HIZENTRA dose groups remained relatively stable while subjects in the placebo group deteriorated in mean INCAT score, mean grip strength, mean Medical Research Council sum score, and mean Rasch-built Overall Disability Scale (R-ODS) centile score.

PATH Extension Study

The PATH Extension study was a multicenter, 48-week, open-label extension study that evaluated the long-term safety and efficacy of HIZENTRA 0.2 g/kg and 0.4 g/kg doses in the maintenance treatment of CIDP in subjects who either completed or were being successfully rescued from CIDP relapse with IGIV treatment in the PATH study.

A total of 82 subjects were enrolled. In the study, subjects who started on a HIZENTRA 0.2 g/kg dose were up-titrated to 0.4 g/kg dose if they relapsed. In the case of no relapse, subjects remained at a dose of 0.2 g/kg. Subjects who started on a HIZENTRA 0.4 g/kg dose were down-titrated to 0.2 g/kg dose after 24 weeks of treatment and subjects who relapsed on a HIZENTRA 0.2 g/kg dose were up-titrated to a 0.4 g/kg dose. Due to the study design, the same subject could have received both doses during the study; 72 subjects received doses of 0.4 g/kg, and 73 subjects received doses of 0.2 g/kg during the efficacy evaluation period.

Subjects who completed the PATH study without relapse on a 0.4 g/kg dose and initially received this dose in the PATH extension study, had a relapse rate of 5.6% (1/18 subjects). Subjects who completed the PATH study without relapse on a 0.2 g/kg dose and initially received this dose in the extension study had a relapse rate of 50% (3/6 subjects).

For all subjects who received 0.4 g/kg in the PATH Extension study, 9.7% (7/72 subjects) had a relapse. For all subjects who received 0.2 g/kg in the PATH extension study, 47.9% (35/73 subjects) had a relapse.

After down-titrating from HIZENTRA 0.4 g/kg to 0.2 g/kg, 50% (26/52) of subjects relapsed, of whom 92% (24/26) recovered after returning to HIZENTRA 0.4 g/kg. A total of 35 subjects relapsed on HIZENTRA 0.2 g/kg dose, of which 89% (31/35) subjects recovered after returning to 0.4 g/kg dose.

Both the PATH and PATH Extension studies demonstrated that HIZENTRA 0.2 g/kg or 0.4 g/kg dose was effective in preventing CIDP relapse when administered weekly with the HIZENTRA 0.4 g/kg dose more likely to prevent relapse.

HIZENTRA is supplied in a prefilled syringe or a tamper-evident vial containing 0.2 grams of protein per mL of preservative-free liquid. The HIZENTRA packaging components are not made with natural rubber latex.

Each product presentation includes a package insert and the following components:

Table 11: How Supplied

Prefilled Syringes:

Presentation	Carton NDC Number	Components
5 mL	44206-456-21	Prefilled syringe containing 1 gram of protein (NDC 44206-456-94)
10 mL	44206-457-22	Prefilled syringe containing 2 grams of protein (NDC 44206-457-95)
20 mL	44206-458-24	Prefilled syringe containing 4 grams of protein (NDC 44206-458-96) with plunger rod.
50 mL	44206-455-25	Prefilled syringe containing 10 grams of protein (NDC 44206-455-97) with plunger rod.

Vials:

Presentation	Carton NDC Number	Components
5 mL	44206-451-01	Vial containing 1 gram of protein (NDC 44206-451-90)
10 mL	44206-452-02	Vial containing 2 grams of protein (NDC 44206-452-91)
20 mL	44206-454-04	Vial containing 4 grams of protein (NDC 44206-454-92)
50 mL	44206-455-10	Vial containing 10 grams of protein (NDC 44206-455-93)

Storage and Handling

Store the HIZENTRA prefilled syringe or vial in its original carton to protect it from light.
Each prefilled syringe or vial label contains a peel-off strip with the prefilled syringe or vial size and product lot number for use in recording doses in a patient treatment record.
When stored at room temperature (up to 25°C [77°F]), HIZENTRA is stable for up to 30 months, as indicated by the expiration date printed on the outer carton of the prefilled syringe or vial label.
Do not shake the HIZENTRA prefilled syringe or vial.
Do not freeze. Do not use product that has been frozen.
Discard any unused product and all used disposable supplies after each infusion.

INSTRUCTIONS FOR USE

HIZENTRA® (hi-ZEN-tra)
(Immune Globulin Subcutaneous (Human), 20% Liquid)
for subcutaneous use only

HIZENTRA is provided in a carton containing:

Single-dose prefilled syringes (5 mL, 10 mL, 20 mL, and 50 mL) or
Single-dose vials (5 mL, 10 mL, 20 mL, and 50 mL).

Store HIZENTRA in its original carton at room temperature until ready to use. Do not use the prefilled syringe or vial if the packaging is damaged.

Step 1: Assemble supplies

Gather the HIZENTRA prefilled syringe(s) or vial(s), all supplies, and infusion log book:

: Infusion administration tubing
: Subcutaneous needle or catheter sets
: Syringes
: Transfer device or needle(s)
: Syringe-to-syringe transfer device (tip-to-tip connector)
: Gauze and tape, or transparent dressing
: Infusion pump and any adapters (if required)
: Sharps container
: Alcohol wipes
: Antiseptic skin preps

Step 2: Clean surface

Clean a table or other flat surface.

Step 3: Wash hands

Thoroughly wash and dry your hands (Figure 1).

Figure 1

Step 4: Check prefilled syringe(s) or vial(s)

If using prefilled syringes, carefully peel back the transparent covering from the tray and inspect the protective cap. Peel back the outer layer of the wrap-around label to allow for viewing of HIZENTRA through the fully transparent inner layer, but don't remove the label completely (Figure 2).
Figure 2
If using vials, inspect the protective cap of the vials (Figure 3).
Figure 3

Carefully inspect each prefilled syringe(s) or vial(s) of HIZENTRA. HIZENTRA is a clear and pale yellow to light brown solution. Do not use the prefilled syringe or vial if:

The liquid looks cloudy, contains particles, or has changed color.
It is damaged, or the protective cap is missing or defective.
The expiration date on the label has passed.

Step 5: Prepare HIZENTRA for infusion

If using HIZENTRA prefilled syringes, go to Step 5.1
If using HIZENTRA vials, go to Step 5.2

Step 5.1: HIZENTRA prefilled syringe(s)

The 5 mL, 10 mL, 20 mL, and 50 mL prefilled syringes are supplied and ready to use. The 5 mL and 10 mL prefilled syringes are fully assembled (Figure 4). For the 20 mL and 50 mL prefilled syringes, screw the plunger rod onto the prefilled syringe stopper prior to use Figure 5).
Figure 4

Figure 5
HIZENTRA prefilled syringes can be placed directly in the infusion pump if the prefilled syringe size matches the pump requirements. If the prefilled syringe can be placed directly in the infusion pump, then go to Step 6.

NOTE:
An additional adapter may be required for the HIZENTRA prefilled syringes to fit properly in the infusion pump. Check with the provider of your supplies for the appropriate adapter and installation instructions.

If the HIZENTRA prefilled syringe size does not match the infusion pump requirements, transfer the contents of the prefilled syringe to another syringe of a size specific for the infusion pump by following the directions below:
- Use a syringe-to-syringe transfer device (tip-to-tip connector) (Figure 6) to transfer the contents of the prefilled syringe to the empty syringe specific for the infusion pump.
  Figure 6
- Remove the protective cap from the prefilled syringe. Attach the transfer device (tip-to-tip connector) by twisting it onto the prefilled syringe. Attach the empty syringe by screwing it onto the other side of the transfer device (Figure 7).

Figure 7

Make sure you transfer the amount needed to achieve the prescribed dose.
- Measure dose from the top of the stopper.
Push the plunger of the prefilled syringe (e.g., using your fingers, thumb or the palm of your hand) to transfer HIZENTRA from the prefilled syringe to the empty syringe.
- Repeat this step if multiple prefilled syringes are necessary to achieve the prescribed dose. Remove the emptied prefilled syringe and attach another prefilled syringe to the transfer device (tip-to-tip connector).
After the transfer is complete, remove the emptied prefilled syringe and the transfer device (tip-to-tip connector) by unscrewing them from the syringe specific for your pump. Connect the filled syringe to the infusion tubing.

Go to Step 6.

Step 5.2: Transfer HIZENTRA from vial to syringe

Take the protective cap off the vial (Figure 8).
Figure 8
Clean the vial stopper with an alcohol wipe (Figure 9). Let the stopper dry.
Figure 9
Attach a needle or transfer device to a syringe tip, using aseptic technique.
If using a transfer device, follow the instructions provided by the device manufacturer.
If using a needle and a syringe to transfer HIZENTRA, follow the instructions below:
- Attach a sterile transfer needle to a sterile syringe (Figure 10).
  Figure 10
- Pull out the plunger of the syringe to fill the syringe with air. Make sure the amount of air is the same as the amount of HIZENTRA you will transfer from the vial.
- Put the HIZENTRA vial on a flat surface. Keeping the vial upright, insert the transfer needle into the center of the rubber stopper.
- Check that the tip of the needle is not in the liquid. Push the plunger of the syringe down. This will inject the air from the syringe into the airspace of the vial.
- Leaving the needle in the stopper, carefully turn the vial upside down (Figure 11).
  Figure 11
- Slowly pull back on the plunger of the syringe to fill the syringe with HIZENTRA.
  - Take the filled syringe and needle out of the stopper. Take off the needle and throw it away in the sharps container.

When using multiple vials to achieve the prescribed dose, repeat this step.

Step 6: Prepare infusion pump and tubing

Prior to preparing the pump(s), make sure you have the prescribed dose in the syringe(s) and the infusion tubing is attached.
Prepare the infusion pump (following the manufacturer's instructions), including attaching any necessary adapters.
Do not remove the needle caps until you are ready to infuse.
Prime (fill) the infusion tubing. To prime the tubing, connect the syringe filled with HIZENTRA to the infusion tubing and gently push on the syringe plunger (e.g., using your fingers, thumb or the palm of your hand) to fill the tubing with HIZENTRA (Figure 12).
Stop priming before HIZENTRA fluid reaches the capped needle.
Insert the syringe filled with HIZENTRA into the infusion pump

Figure 12

Step 7: Prepare infusion site(s)

Select an area on your abdomen, thigh, upper arm, or side of upper leg/hip for the infusion (Figure 13).
Figure 13
Use a different site with every HIZENTRA infusion. New sites should be at least 1 inch from a previous infusion site.
Never infuse into areas where the skin is tender, bruised, red, or hard. Avoid infusing into scars or stretch marks.
You can use up to 8 infusion sites at the same time. If you are using more than one infusion site, at the same time, be sure the infusion sites are at least 2 inches apart. More than one infusion device can be used simultaneously.
Clean the skin at each infusion site with an antiseptic skin prep (Figure 14). Let the skin dry.
Figure 14

Step 8: Insert needle(s)

Use one needle per site. If injecting in more than one site, the following steps should be completed for each needle, one at a time.
Remove the needle cap.
Using two fingers, pinch together the skin around the infusion site. With a quick dart-like motion, insert the needle straight into the skin (Figure 15).
Figure 15
Put sterile gauze and tape or a transparent dressing over the infusion site (Figure 16). This will keep the needle from coming out.
Figure 16

Step 9: Start infusion

Follow the manufacturer's instructions to turn on the infusion pump and start the infusion (Figure 17).
Figure 17

Step 10: Complete infusion and record treatment (Figure 18)

When all the HIZENTRA has been infused turn off the infusion pump (if used).
Remove the needle(s) from the skin.
Once you have removed the needle(s), remove the empty syringe from the infusion pump. Disconnect the infusion set from the empty syringe.
Cover the infusion site with a protective dressing.
Peel off the removable part of the label for each prefilled syringe or vial. Put this label in your log book with the date and time of the infusion and include the exact amount of HIZENTRA that you infused. Scan the prefilled syringe or vial if recording the infusion electronically.
Figure 18

Step 11: Clean up

If applicable, remove adapter from the infusion pump following the manufacturer's instructions.
Throw away the empty HIZENTRA prefilled syringe(s) or vial(s), along with the used disposable supplies, in the sharps container (Figure 19) in accordance with local requirements.
Figure 19
Clean and store the infusion pump, following the manufacturer's instructions.

Be sure to tell your doctor about any problems you have doing your infusions. Your doctor may ask to see your treatment diary or log book, so be sure to take it with you each time you visit the doctor's office.

Call your doctor for medical advice about side effects. You can also report side effects to FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Manufactured by:
CSL Behring AG
Bern, Switzerland
U.S. License No. 1766

Distributed by:
CSL Behring LLC
Kankakee, IL 60901 USA

This Instructions for Use has been approved by the U.S. Food and Drug Administration.

Revised: 04/2023

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Overview

Reduce patient OOP costs for drug (and occasionally for drug administration/infusion costs or drug-related test costs)

Patient benefit

A portion (or all) of patient OOP (deductible, copay), typically up to monthly and/or annual max

Patient eligibility

Patient must enroll or activate (may permit HCPs to enroll on patient’s behalf for HCP-administered drugs)
Generally, must have commercial insurance (rarely, may permit uninsured patients to use)
May never be used with government insurance

How to sign up

Cards may be downloadable digital cards or hard copies
Some pharmacos offer debit cards with pre-loaded copay benefit
Typically, available through multiple channels (e.g., rep to HCP to patient; pharmacy to patient; patient via website, Hub live agent, or copay vendor (live agent or IVR); patient and HCP via Hub enrollment form)
Some HCP-administered product programs permit HCPs to enroll on a patient’s behalf through via Hub form

Bridge program

Overview

Provide patient immediate access to therapy during an insurance delay (typically new starts; some may cover change in insurance)
Limited time/ fill (typically 7-30 days; some may offer additional fill for continued delay up to certain limit)

Patient benefit

100% free (outside of insurance)

Patient eligibility

HCP must enroll patient
May be limited to commercially insured patients (i.e., no government beneficiaries); some programs may allow government beneficiaries

Initial HIZENTRA dose	= Previous IGIV dose (in grams) × 1.37
	Number of weeks between IGIV doses

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