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Gammagard Liquid

Generic Name: human immunoglobulin g
Dosage Form: injection, solution

WARNING: ACUTE RENAL DYSFUNCTION AND ACUTE RENAL FAILURE

  • Renal dysfunction, acute renal failure, osmotic nephropathy, and death may occur with immune globulin intravenous (IGIV) products in predisposed patients. Patients predisposed renal dysfunction include those with any degree of pre-existing renal insufficiency, diabetes mellitus, advanced age (above 65 years of age), volume depletion, sepsis, paraproteinemia, or patients receiving known nephrotoxic drugs.
  • Renal dysfunction and acute renal failure occur more commonly in patients receiving IGIV products containing sucrose. Gammagard Liquid does not contain sucrose.
  • For patients at risk of renal dysfunction or failure, administer Gammagard Liquid at the minimum infusion rate practicable.

Indications and Usage for Gammagard Liquid

Gammagard Liquid is indicated as replacement therapy for primary humoral immunodeficiency (PI) in adult and pediatric patients two years of age or older. This includes, but is not limited to, common variable immunodeficiency (CVID), X-linked agammaglobulinemia, congenital agammaglobulinemia, Wiskott-Aldrich syndrome, and severe combined immunodeficiencies1,2.

Gammagard Liquid Dosage and Administration

Dosage

Table 1. Dosage and Administration
Dose Initial Infusion rate Maintenance Infusion rate
Intravenous Administration:
• 300 to 600 mg/kg every 3 to 4 weeks based on clinical response

0.5 mL/kg/hr

(0.8 mg/kg/min) for 30 minutes

Increase every 30 minutes (if tolerated) up to 5 mL/kg/hr (8 mg/kg/min)
Subcutaneous Administration:

• Initial Dose is 1.37 × previous intravenous dose divided by # of weeks between intravenous doses.

• Maintenance dose is based on clinical response and target IgG trough level (2.2).

40 kg BW and greater: 30 mL/site at 20 mL/hr/site.

Under 40 kg BW: 20 mL/site at 15 mL/hr/site

40 kg BW and greater: 30 mL/site at 20 to 30 mL/hr/site.

Under 40 kg BW: 20 mL/site at 15 to 20 mL/hr/site

 Adjust dose according to IgG levels and clinical response, as the frequency and dose of immune globulin may vary from patient to patient.

No randomized controlled clinical trials are available to determine an optimum trough serum IgG level for intravenous treatment. If a patient misses a dose, administer the missed dose as soon as possible, and then resume scheduled treatments every 3 or 4 weeks, as applicable.

Prior to switching from intravenous to subcutaneous treatment, obtain the patient’s serum IgG trough level to guide subsequent dose adjustments. Start the initial subcutaneous dose approximately one week after the last intravenous infusion.

Dose Adjustments for Subcutaneous Administration

Based on the results of clinical studies, the expected increase in serum IgG trough level while on weekly subcutaneous treatment, at the dose adjusted to provide a comparable AUC, is projected to be approximately 281 mg/dL higher than the last trough level during prior stable intravenous treatment. To calculate the target trough IgG level for subcutaneous treatment, add 281 mg/dL to the IgG trough level obtained after the last intravenous treatment.

To guide dose adjustment, calculate the difference between the patient’s target serum IgG trough level and the IgG trough level during subcutaneous treatment. Find this difference in the columns of Table 2 and the corresponding amount (in mL) by which to increase (or decrease) the weekly dose based on the patient's body weight. If the difference between measured and target trough levels is less than 100 mg/dL then no adjustment is necessary. However, the patient's clinical response should be the primary consideration in dose adjustment.

Table 2. Change in Weekly Dose of Gammagard Liquid for Intended IgG Trough Level Adjustment *
*
Derived using a linear approximation to the nomogram method with a slope of 5.3 kg/dL
Difference between Measured and Target IgG Trough Levels
Body Weight 100 mg/dL 200 mg/dL 300 mg/dL 400 mg/dL
10 kg 2 mL 4 mL 6 mL 8 mL
20 kg 4 mL 8 mL 11 mL 15 mL
30 kg 6 mL 11 mL 17 mL 23 mL
40 kg 8 mL 15 mL 23 mL 30 mL
50 kg 9 mL 19 mL 28 mL 38 mL
60 kg 11 mL 23 mL 34 mL 45 mL
70 kg 13 mL 26 mL 40 mL 53 mL
80 kg 15 mL 30 mL 45 mL 60 mL
90 kg 17 mL 34 mL 51 mL 68 mL
100 kg 19 mL 38 mL 57 mL 75 mL
110 kg 21 mL 42 mL 62 mL 83 mL
120 kg 23 mL 45 mL 68 mL 91 mL
130 kg 25 mL 49 mL 74 mL 98 mL
140 kg 26 mL 53 mL 79 mL 106 mL

Example 1: A patient with a body weight of 80 kg has a measured IgG trough level of 800 mg/dL and the target trough level is 1000 mg/dL. The desired target trough level difference is 200 mg/dL (1000 mg/dL minus 800 mg/dL). The weekly dose of Gammagard Liquid should beincreased by 30 mL (3.0 gm).

Example 2: A patient with a body weight of 60 kg has a measured IgG trough of 1000 mg/dL and the target trough level is 800 mg/dL. The desired target trough level difference is 200 mg/dL (800 mg/dL minus 1000 mg/dL). The weekly dose of Gammagard Liquid should bedecreased by 23 mL (2.3 gm).

Preparation and Handling

  • Inspect the drug product visually for particulate matter and discoloration prior to administration. Gammagard Liquid is a clear or slightly opalescent, colorless or pale yellow solution. Do not use if the solution is cloudy, turbid, or if it contains particulates.
  • Gammagard Liquid vial is for single use only. Any vial that has been entered should be used promptly. Partially used vials should be discarded. Gammagard Liquid contains no preservative.
  • Allow refrigerated product to come to room temperature before use.
  • DO NOT MICROWAVE.
  • Do not shake.
  • Do not mix with other products.
  • Do not use normal saline as a diluent. If dilution is desired, 5% dextrose in water (D5W) should be used as a diluent.
  • The infusion line may be flushed with normal saline. An in-line filter is optional.
  • Record the name and lot number of the product in the recipient's records.

Administration

Intravenous

Table 3. Infusion Rates for Intravenous Administration
Initial

0.5 mL/kg/hr

(0.8 mg/kg/min) for 30 minutes
Subsequent Increase every 30 minutes (if tolerated) up to 5 mL/kg/hr (8 mg/kg/min)

Monitor patient vital signs throughout the infusion. Certain adverse reactions such as headaches, flushing and changes in pulse rate and blood pressure may be related to the rate of infusion. Slow or stop infusion if adverse reactions occur. If symptoms subside promptly, the infusion may be resumed at a lower rate that does not result in recurrence of the symptoms.

Adverse reactions may occur more frequently in patients receiving immune globulin for the first time, upon switching brands or if there has been a long interval since the previous infusion2. In such cases, start at lower infusion rates and gradually increase as tolerated.

Ensure that patients with pre-existing renal insufficiency are not volume depleted. For patients over 65 years of age or judged to be at risk for renal dysfunction or thrombotic events, administer Gammagard Liquid at the minimum infusion rate practicable. In such cases, the maximal rate should be less than 3.3 mg/kg/min (< 2mL/kg/hr), and consider discontinuation of administration if renal function deteriorates. (see WARNINGS AND PRECAUTIONS [5.2, 5.4] and USE IN SPECIFIC POPULATION [8.5]).

Subcutaneous

Table 4. Infusion Rates for Subcutaneous Administration
40 kg BW and greater Under 40 kg BW
Initial

30 mL/site at a rate of 20 mL/hr/site

20 mL/site at a rate of 15 mL/hr/site
Maintenance

30 mL/site at a rate of 20 to 30 mL/hr/site

20 mL/site at a rate of 15 to 20 mL/hr/site

Selection of Infusion Site: Suggested areas for subcutaneous infusion of Gammagard Liquid are abdomen, thighs, upper arms, or lower back. Infusion sites should be at least two inches apart, avoiding bony prominences. Rotate sites each week.

Volume per Site: The weekly dose (mL) should be divided by 30 or 20, based on patient weight above, to determine the number of sites required. Simultaneous subcutaneous infusion at multiple sites can be facilitated by use of a multi-needle administration set.

Rate of Infusion for Patients 40 kg and greater (88 lbs):If multiple sites are used, the rate set on the pump should be the rate per site multiplied by the number of sites (e.g., 30 mL x 4 sites = 120 mL/hr). The number of simultaneous sites should be limited to 8, or maximum infusion rate of 240 mL/hr.

Rate of Infusion for Patients under 40 kg (88 lbs): If multiple sites are used, the rate set on the pump should be the rate per site multiplied by the number of sites (e.g., 20 mL x 3 sites = 60 mL/hr). The number of simultaneous sites should be limited to 8, or maximum infusion rate of 160 mL/hr.

Instructions for Subcutaneous Administration: Instruct patients to observe the following procedures:

1. Aseptic technique- Use aseptic technique when preparing and infusing Gammagard Liquid.

2. Assemble supplies - Set up a clean work area and gather all supplies necessary for the subcutaneous infusion: vial(s) of Gammagard Liquid, ancillary supplies, sharps container and pump. If Gammagard Liquid has already been pooled into a bag or a syringe, skip to Step 5.

3. Product preparation - Remove the protective cap from the vial to expose the center of the vial. Wipe the stopper with an alcohol pad and allow to dry. 

4. Withdraw Gammagard Liquid from the vials - Attach a sterile syringe to a needle and draw air into the syringe barrel equal to the amount of product to be withdrawn. Inject the air into the vial and withdraw the desired volume of Gammagard Liquid. If multiple vials are required to achieve the desired dose, repeat this step. 

5. Prepare the infusion pump and tubing - Follow the manufacturer’s instructions for preparing the pump and administration tubing, if needed. Be sure to prime the pump tubing to ensure that no air is left in the tubing and needle.

6. Select the infusion sites - Select the number of infusion sites depending on the volume of the total dose. See Administration[2.3] for recommended maximum volumes and rates. Potential sites for infusion include the back of arms, abdomen, thighs, and lower back (see Figure below). Ensure sites are at least 2 inches apart; avoid bony prominences.

7. Cleanse the infusion site(s) - Cleanse the infusion site(s) with an antiseptic skin preparation (e.g., alcohol pad) using a circular motion working from the center of the site and moving to the outside. Allow to dry.

8. Insert the needle - Choose the correct needle length to assure that Gammagard Liquid is delivered into the subcutaneous space. Grasp the skin and pinch at least one inch of skin between two fingers. Insert needle at a 90 degree angle with a darting motion into the subcutaneous tissue. Secure the needle.

9. Check for proper needle placement – Prior to the start of infusion, check each needle for correct placement to make sure that a blood vessel has not been punctured. Gently pull back on the attached syringe plunger and monitor for any blood return in the needle set. If you see any blood, remove and discard the needle set. Repeat priming and needle insertion steps in a different infusion site with a new needle set.

10. Secure the needle to the skin - Secure the needle(s) in place by applying a sterile protective dressing over the site.

11. Start infusion of Gammagard Liquid – Follow the manufacturer’s instructions to turn pump on.

12. Document the infusion - Remove the peel-off label with product lot number and expiration date from the Gammagard Liquid vial and place in treatment diary/log book to keep track of the product lots used. Keep the treatment diary/log book current by recording the time, date, dose, product label and any reactions after each infusion.

13. Remove needle set – After the infusion is complete, remove the needle set and gently press a small piece of gauze over the needle insertion site and cover with a protective dressing. Discard any unused solution and disposable supplies in accordance with local requirements.

Dosage Forms and Strengths

Gammagard Liquid is an aqueous solution containing 10% IgG (100 mg/mL).

Contraindications

Hypersensitivity Reaction to Immune Globulins

Gammagard Liquid is contraindicated in patients who have had a history of anaphylactic or severe systemic hypersensitivity reactions to the administration of human immune globulin.

IgA Sensitive Patients with History of Hypersensitivity Reactions

Gammagard Liquid is contraindicated in IgA-deficient patients with antibodies to IgA and a history of hypersensitivity. Anaphylaxis has been reported with the intravenous use of Gammagard Liquid and is theoretically possible following subcutaneous administration (5.1).

Warnings and Precautions

Hypersensitivity

Severe hypersensitivity reactions may occur, even in patients who had tolerated previous treatment with human normal immune globulin. In case of hypersensitivity, discontinue Gammagard Liquid infusion immediately and institute appropriate treatment.

Gammagard Liquid contains trace amount of IgA (average concentration of 37μg/mL). Patients with antibodies to IgA have a greater risk of developing potentially severe hypersensitivity and anaphylactic reactions. Gammagard Liquid is contraindicated in patients with antibodies against IgA and a history of hypersensitivity reaction (see CONTRAINDICATIONS[4] )

Renal Dysfunction/Failure

Acute renal dysfunction/failure, acute tubular necrosis, proximal tubular nephropathy, osmotic nephrosis and death may occur upon use of IGIV treatment, especially those containing sucrose3. Acute renal dysfunction/failure has been reported in association with infusions of Gammagard Liquid. Assure that patients are not volume depleted prior to the initiation of infusion of Gammagard Liquid. In patients who are at risk of developing renal dysfunction, because of pre-existing renal insufficiency or predisposition to acute renal failure (such as diabetes mellitus, age greater than 65, volume depletion, sepsis, paraproteinemia, or patients receiving known nephrotoxic drugs, etc.), administer Gammagard Liquid intravenously at the minimum rate of infusion practicable (not exceeding 3.3 mg IgG/kg/min (< 2 mL/kg/hr) (see DOSAGE AND ADMINISTRATION [2.3]).

Periodic monitoring of renal function and urine output is particularly important in patients judged to be at increased risk for developing acute renal failure. Assess renal function, including measurement of blood urea nitrogen (BUN) and serum creatinine, before the initial infusion of Gammagard Liquid and again at appropriate intervals thereafter. If renal function deteriorates, consider discontinuation of Gammagard Liquid (see DOSAGE AND ADMINISTRATION[2]).

Hyperproteinemia, Increased Serum Viscosity, and Hyponatremia

 Hyperproteinemia, increased serum viscosity and hyponatremia may occur in patients receiving Gammagard Liquid. It is critical to distinguish true hyponatremia from a pseudohyponatremia that is temporally or causally related to hyperproteinemia with concomitant decreased calculated serum osmolality or elevated osmolar gap; because treatment aimed at decreasing serum free water in patients with pseudohyponatremia may lead to volume depletion, a further increase in serum viscosity and a predisposition to thromboembolic events4.

Thrombotic Events

Thrombotic events, including myocardial infarction, cerebral vascular accident, deep vein thrombosis, and pulmonary embolism, have been reported in association with intravenous use of Gammagard Liquid (see ADVERSE REACTIONS [6]). Thrombotic events have also been reported with subcutaneous administration of immune globulin. Patients at risk for thrombotic events include those with a history of atherosclerosis, multiple cardiovascular risk factors, advanced age, impaired cardiac output, coagulation disorders, prolonged periods of immobilization, obesity, diabetes mellitus, acquired or inherited thrombophilic disorder, a history of vascular disease, or a history of a previous thrombotic or thromboembolic event.
Consider baseline assessment of blood viscosity in patients at risk for hyperviscosity, including those with cryoglobulins, fasting chylomicronemia/markedly high triacylglycerols (triglycerides), or monoclonal gammopathies (see WARNINGS AND PRECAUTIONS [5.9]). For patients judged to be at risk of developing thrombotic events, administer Gammagard Liquid intravenously at the minimum rate of infusion practicable, not exceeding 3.3 mg IgG/kg/min (< 2 mL/kg/hr) (see DOSAGE AND ADMINISTRATION [2.3]). When administering subcutaneously monitor the patients for signs and symptoms of thrombotic events.

Aseptic Meningitis Syndrome (AMS)

AMS may occur with IGIV treatment, and has been reported with intravenous use of Gammagard Liquid. Discontinuation of IGIV treatment has resulted in remission of AMS within several days without sequelae. The syndrome usually begins within several hours to two days following IGIV treatment.

AMS is characterized by the following signs and symptoms: severe headache, nuchal rigidity, drowsiness, fever, photophobia, painful eye movements, nausea and vomiting. (see PATIENT COUNSELING INFORMATION [17]). Cerebrospinal fluid (CSF) studies frequently reveal pleocytosis up to several thousand cells per mm3, predominantly from the granulocytic series, and elevated protein levels up to several hundred mg/dL, but negative culture results. Conduct a thorough neurological examination on patients exhibiting such symptoms and signs, including CSF studies, to rule out other causes of meningitis.

AMS may occur more frequently with high dose (2 g/kg) IGIV treatment and/or rapid infusion of IGIV.

Hemolysis

Gammagard Liquid contains blood group antibodies which may act as hemolysins and induce in vivo coating of red blood cells (RBC) with immune globulin. These antibodies may cause a positive direct antiglobulin reaction and hemolysis3,5. Acute intravascular hemolysis has been reported, and  delayed hemolytic anemia can develop due to enhanced RBC sequestration (see ADVERSE REACTIONS [6]).

Monitor patients for clinical signs and symptoms of hemolysis (see WARNINGS AND PRECAUTIONS [5.9]). If signs and/or symptoms of hemolysis such as dark colored urine, swelling, fatigue or difficulty breathing, are present after Gammagard Liquid infusion, perform appropriate confirmatory laboratory testing (see PATIENT COUNSELING INFORMATION [17]).

Transfusion-Related Acute Lung Injury (TRALI)

Non-cardiogenic pulmonary edema (TRALI) has been reported in patients following treatment with IGIV products, including Gammagard Liquid. TRALI is characterized by severe respiratory distress, pulmonary edema, hypoxemia, normal left ventricular function, and fever. Symptoms typically occur within 1 to 6 hours after treatment.

Monitor patients for pulmonary adverse reactions (see PATIENT COUNSELING INFORMATION[17]). If TRALI is suspected, perform appropriate tests for the presence of anti-neutrophil and anti-HLA antibodies in both the product and patient serum. TRALI may be managed using oxygen therapy with adequate ventilatory support.

Transmittable Infectious Agents

Because Gammagard Liquid is made from human plasma, it may carry a risk of transmitting infectious agents, e.g., viruses, the variant Creutzfeldt-Jakob disease (vCJD) agent, and theoretically, the classic Creutzfeldt-Jakob disease agent. This also applies to unknown or emerging viruses and other pathogens. No cases of transmission of viral diseases or vCJD have been associated with Gammagard Liquid.

ALL infections thought by a physician to possibly have been transmitted by this product should be reported by the physician or other healthcare provider to Baxter Healthcare Corporation, at 1-800-423-2862 (in the U.S.).

Monitoring: Laboratory Tests

  • Periodic monitoring of renal function and urine output is particularly important in patients judged to be at increased risk of developing acute renal failure. Assess renal function, including measurement of BUN and serum creatinine, before the initial infusion of Gammagard Liquid and at appropriate intervals thereafter.
  • Consider baseline assessment of blood viscosity in patients at risk for hyperviscosity, including those with cryoglobulins, fasting chylomicronemia/markedly high triacylglycerols (triglycerides), or monoclonal gammopathies, because of the potentially increased risk of thrombosis3.
  • If signs and/or symptoms of hemolysis are present after an infusion of Gammagard Liquid, perform appropriate laboratory testing for confirmation.
  • If TRALI is suspected, perform appropriate tests for the presence of anti-neutrophil antibodies and anti-HLA antibodies in both the product and patient’s serum.

Interference with Laboratory Tests

After infusion of IgG, the transitory rise of the various passively transferred antibodies in the patient’s blood may yield false positive serological testing results, with the potential for misleading interpretation. Passive transmission of antibodies to erythrocyte antigens (e.g., A, B, and D) may cause a positive direct or indirect antiglobulin (Coombs’) test.

Adverse Reactions

Intravenous: The most serious adverse reaction seen during intravenous treatment in the clinical trials was two episodes of aseptic meningitis in one subject. The most common adverse reactions (observed in ≥5% of subjects) were headache, pyrexia, fatigue, rigors, nausea, chills, dizziness, vomiting, migraine headache, pain in extremity, urticaria, cough, pruritus, rash and tachycardia.

Subcutaneous
: No serious adverse reactions were observed during the clinical trial of subcutaneous treatment. The most common adverse reactions during subcutaneous treatment (observed in ≥5% of subjects) were local infusion site reactions. The most common systemic reactions were headache, fever, fatigue, increased heart rate, increased systolic blood pressure, and upper abdominal pain.

Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.

Intravenous Administration

The safety of Gammagard Liquid intravenous infusion was evaluated in 61 subjects6. Of all adverse experiences, 15 events in 8 subjects were serious with two episodes of aseptic meningitis in one patient deemed to be possibly related to the infusion of Gammagard Liquid.

Among the 896 non-serious adverse experiences, 258 were judged by the investigator to be possibly or probably related to the infusion of Gammagard Liquid. Of these, 136 were rated as mild (transient discomfort that resolves spontaneously or with minimal intervention), 106 were rated as moderate (limited impairment of function and resolves spontaneously or with minimal intervention with no sequelae), and 16 were rated as severe (marked impairment of function or can lead to temporary inability to resume normal life pattern; requires prolonged intervention or results in sequelae). All of the severe non-serious adverse experiences were transient, did not lead to hospitalization, and resolved without complication. One subject withdrew from the study due to a non-serious adverse experience (papular rash).

Temporally associated adverse events are those occurring during or within 72 hours of completion of an infusion, regardless of causality. Of the 345 temporally related adverse events, those occurring in > 5% of subjects are shown in Table 5 Only one event, headache, occurred in association with more than 5% of infusions.

Table 5. Adverse Events*, Regardless of Causality, that Occurred within 72 Hours of Infusion
*
Excluding Infections
Event By Infusion N (%) By Subject N (%)
Headache 57 (7%) 22(36%)
Fever 19(2%) 13(21%)
Fatigue 18(2%) 10(16%)
Vomiting 10(1%) 9(15%)
Chills 14(2%) 8(23%)
Infusion site events 8(1%) 8(13%)
Nausea 9(1%) 6(10%)
Dizziness 7(1%) 6(10%)
Pain in Extremity 7(1%) 5(8%)
Diarrhea 7(1%) 5(8%)
Cough 5(1%) 5(8%)
Pruritus 5(1%) 4(7%)
Pharyngeal Pain 5(1%) 4(7%)

Table 6 lists the related adverse events occurring in 5% or more of the 61 subjects from the pivotal multicenter clinical study. Adverse drug reactions (ADR's) are those adverse events that were deemed by the investigators as causally related to the infusion of Gammagard Liquid.

Table 6. Adverse Reactions Occurring in 5% or More of Subjects
Event By Infusion N (%) By Subject N (%)
Headache 90 (5%) 27 (44%)
Pyrexia 23 (1%) 13 (21%)
Fatigue 26 (1%) 10 (16%)
Rigors 14 (1%) 8 (13%)
Nausea 11 (1%) 8 (13%)
Chills 13 (1%) 7 (12%)
Dizziness 8 (0.4%) 5 (8%)
Vomiting 6 (0.3%) 5 (8%)
Migraine 16 (1%) 4 (7%)
Pain in Extremity 10 (1%) 4 (7%)
Urticaria 8 (0.4%) 4 (7%)
Cough 4 (0.2%) 3 (5%)
Pruritus 4 (0.2%) 3 (5%)
Rash 4 (0.2%) 3 (5%)
Tachycardia 3 (0.2%) 3 (5%)

31 of the 258 non-serious adverse events were not previously listed as associated with Gammagard Liquid and thus were considered unexpected. A total of 14 hospitalizations occurred during the study but none were related to infection.

Subcutaneous Administration

The safety of Gammagard Liquid subcutaneous infusion was evaluated in 47 subjects.

The most common ADRs with subcutaneous infusion of Gammagard Liquid observed in ≥5% of study subjects in the clinical trial were local infusion site reactions (e.g., swelling, redness, pain), as well as systemic reactions of headache, fever, fatigue, increased heart rate, increased systolic blood pressure, and upper abdominal pain.

Of the 632 non-serious AEs, the most frequent AEs, regardless of causality, and the most frequent temporally associated AEs, which occurred in ≥10% subjects, are shown in Table 7.

Table 7. Adverse Events Irrespective of Causality* in ≥10% of Subjects
*
Excluding infections
Rate per subcutaneous infusions = total number of events divided by total number of subcutaneous infusions

 

Adverse Event
All Adverse Events Adverse Events* Occurring Within 72 Hours of subcutaneous Infusion

Number (%) of Subjects

(N= 47)

Number (Rate) of Adverse Events

(N= 2294 Infusions)

Number (%) of Subjects

(N= 47)

Number (Rate) of Adverse Events

(N= 2294 Infusions)
Local Reactions 21 (44.7) 56 (0.028) 21 (44.7) 53 (0.027)
Headache 23 (48.9) 45 (0.020) 18 (38.3) 27 (0.012)
Fever 14 (29.8) 22 (0.010) 9 (19.1) 11 (0.005)
Nausea 8 (17.0) 20 (0.010) 3 (6.4) 6 (0.003)
Vomiting 7 (14.9) 12 (0.005) 5 (10.6) 7 (0.003)
Fatigue 7 (14.9) 11 (0.005) 6 (12.8) 10 (0.004)
Diarrhea 5 (10.6) 13 (0.006) 3 (6.4) 3 (0.001)
Asthma 6 (12.8) 9 (0.004) 4 (8.5) 6 (0.003)
Oropharyngeal Pain 6 (12.8) 8 (0.003) 3 (6.4) 3 (0.001)
Abdominal Pain Upper 5 (10.6) 12 (0.005) 5 (10.6) 9 (0.004)

 There were 150 AEs considered to be related to Gammagard Liquid use (ADRs), all of which were non-serious. Of these non-serious ADRs, 124 (83%) were rated as mild (transient discomfort that resolves spontaneously or with minimal intervention), 24 (16%) were rated as moderate (limited impairment of function and resolves spontaneously or with minimal intervention with no sequelae), and 2 were rated as severe (marked impairment of function or can lead to temporary inability to resume normal life pattern; requires prolonged intervention or results in sequelae. Neither of the severe AEs required hospitalization or resulted in sequelae.

The most frequent ADRs (AEs considered by the investigators to be at least possibly related to Gammagard Liquid) that occurred in 5% or more of subjects are shown in Table 8.

Table 8. Related Adverse Reactions* Experienced by  ≥ 5% of Subjects and Rate per Subcutaneous Infusion
*
Excluding infections
Rate per subcutaneous infusions= total number of events divided by total number of subcutaneous infusions
Adverse Reaction

Number (%) of Subjects

(N= 47)

Number (Rate) of Adverse Reactions

(N= 2294 subcutaneous Infusions)
Local Reactions 21 (44.7) 53 (0.027)
Headache 13 (27.7) 20 (0.009)
Fever 6 (12.8) 7 (0.003)
Fatigue 5 (10.6) 8 (0.003)
Heart Rate Increased 3 (6.4) 9 (0.004)
Blood Pressure Systolic Increased 3 (6.4) 6 (0.003)
Abdominal Pain (Upper) 3 (6.4) 4 (0.002)

Local AEs. The incidence of local AEs by MedDRA term during all Gammagard Liquid subcutaneous treatment is shown in Table 9.

Table 9. Local Adverse Events (> 1 Events)* in All Subjects
*
Excluding infections. N=2294 subcutaneous infusions
Mild: transient discomfort that resolves spontaneously or with minimal intervention
Moderate: limited impairment of function and resolves spontaneously or with minimal intervention with no sequelae.
§
Severe: marked impairment of function or can lead to temporary inability to resume normal life pattern; requires prolonged intervention or results in sequelae.
  Number (Rate) of subcutaneous Infusions
Local Adverse Event Mild Moderate Severe§ Total
Pain 14 (0.006) 8 (0.003) 0 (0.000) 22 (0.010)
Hematoma 13 (0.006) 1 (<0.001) 0 (0.000) 14 (0.006)
Pruritus 4 (0.002) 2 (0.001) 0 (0.000) 6 (0.003)
Rash 4 (0.002) 0 (0.000) 0 (0.000) 4 (0.002)
Erythema 3 (0.001) 0 (0.000) 0 (0.000) 3 (0.001)
Edema 3 (0.001) 0 (0.000) 0 (0.000) 3 (0.001)
Hemorrhage 2 (0.001) 0 (0.000) 0 (0.000) 2 (0.001)
Irritation 2 (0.001) 0 (0.000) 0 (0.000) 2 (0.001)
Swelling 1 (<0.001) 1 (<0.001) 0 (0.000) 2 (0.001)

One subject withdrew from the study after 10 treatments with Gammagard Liquid subcutaneous infusion (2.5 months) due to increased fatigue and malaise.

The overall rate of local AEs (excluding infections) during the subcutaneous treatment periods was 2.8% per infusion. In subcutaneous naïve patients, the incidence of local AEs (N = 1757 infusions) was 3.3% (2.6% mild and 0.7% moderate with no severe AEs). In the subjects who were subcutaneous experienced (N = 537 infusions), the incidence of local AEs was 1.1% (1.1% mild, and no moderate or severe AEs).

In the clinical study after all subcutaneous doses were adjusted, all subjects but one reached their maximum rate allowed in the protocol, 20 mL/site/hour if weight was below 40 kg and 30/mL/hour for weight 40 kg and greater, for one or more of the infusions. 70% (31 of 44) of these subjects opted for the highest rate for all infusions.  No subject restricted the rate due to an ADR. In the clinical study, median duration of each weekly infusion was 1.2 hours (range: 0.8 – 2.3 hours) after all subcutaneous doses were adjusted. The rate set on the pump was that rate per site multiplied by the number of sites, with no maximum.

During all subcutaneous treatment periods, 99.8% of infusions were completed without a reduction, interruption, or discontinuation for tolerability reasons. The proportion of subjects who experienced local AEs (excluding infections) was highest immediately following the switch from intravenous to subcutaneous treatment in all age groups. Over subsequent subcutaneous infusions, there was a decrease of local AEs. The rate of all local AEs per infusion immediately after switching from intravenous to subcutaneous treatment was 4.9% (29/595), decreasing to 1.5% (8/538) by the end of the study and to 1.1% (10/893) in the Study Extension.

Eight (17%) subjects experienced a local adverse reaction during the first infusion, but that decreased to 1 (2.1%) for the subsequent infusions, ranging from 0 to 4 (8.7%) during the first year of subcutaneous treatment. No subject reported a local adverse reaction from week 53 to end of study at week 68.

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.

Intravenous ADRs
 

Hematologic

 
Hemolysis, Leukopenia, positive direct Coombs test
Infusion Reactions Hypersensitivity, anaphylactic shock, anaphylactic reaction
Neurological Transient ischemic attack, tremor, burning sensation, cerebral vascular accident
Cardiovascular Deep vein thrombosis, hypotension, phlebitis, hypertension, myocardial infarction, chest pain
Respiratory Pulmonary embolism, pulmonary edema, dyspnea, oxygen saturation decreased, Transfusion-Related Acute Lung Injury (TRALI)
Gastrointestinal Abdominal pain
Integumentary Hyperhidrosis, allergic dermatitis
Psychiatric Anxiety, insomnia
General/Body as a Whole Edema
Renal Acute renal dysfunction/failure

In addition to the events listed above which were observed for Gammagard Liquid, the following events have been identified for IGIV products in general:

Renal Osmotic nephropathy
Respiratory Cyanosis, hypoxemia, bronchospasm, apnea, Acute Respiratory Distress Syndrome (ARDS)
Integumentary Bullous dermatitis, epidermolysis, erythema multiforme, Stevens-Johnson Syndrome
Cardiovascular Cardiac arrest, vascular collapse
Neurological Coma, seizures, loss of consciousness, aseptic meningitis syndrome

Hematologic

Gastrointestinal

Pancytopenia

Hepatic dysfunction

Drug Interactions

Passive transfer of antibodies may transiently impair the immune responses to live attenuated virus vaccines such as mumps, rubella and varicella for up to 6 months and for a year or more to measles (rubeola). Inform the immunizing physician of recent therapy with Gammagard Liquid so that appropriate precautions can be taken (see PATIENT COUNSELING INFORMATION [17]).

USE IN SPECIFIC POPULATIONS

Pregnancy

Pregnancy Category C. Animal reproduction studies have not been conducted with Gammagard Liquid. It is also not known whether Gammagard Liquid 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. Gammagard Liquid should be given to a pregnant woman only if clearly indicated.

Nursing Mothers

It is not known whether Gammagard Liquid is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when Gammagard Liquid is administered to a nursing woman.

Pediatric Use

The safety and effectiveness of Gammagard Liquid have been established in the age groups 2 to 16. Use of Gammagard Liquid in these age groups is supported by evidence from adequate and well-controlled studies of Gammagard Liquid including pediatric subjects. Gammagard Liquid administered intravenously was evaluated in 15 pediatric subjects with PI (7 were 2 to <12 years old and 8 were 12 to <16) in a multicenter clinical study.

Gammagard Liquid administered subcutaneously was evaluated in 18 pediatric subjects with PI (14 were 2 to <12 years old and 4 were 12 to <16) in another multicenter clinical study (see CLINICAL STUDIES [14]). There were no differences in the safety and efficacy profiles as compared with adult subjects. No pediatric-specific dose requirements were necessary to achieve the desired serum IgG levels.

Safety and efficacy of Gammagard Liquid in pediatric patients below the age of 2 have not been established.

Geriatric Use

Limited information is available for the geriatric use of Gammagard Liquid. Gammagard Liquid administered intravenously and subcutaneously was evaluated in two studies with a total of 8 subjects over the age of 65 years. No overall differences in safety or efficacy were observed for this group. Caution should be exercised in administering Gammagard Liquid to patients who are at an increased risk for developing renal failure or thrombotic events. Do not exceed the recommended dose, and infuse Gammagard Liquid at the minimum intravenous infusion rate practicable (See BOXED WARNING, WARNINGS AND PRECAUTIONS [5.2, 5.4] and DOSAGE AND ADMINISTRATION [2.3]).

Overdosage

With intravenous administration, overdose of Gammagard Liquid may lead to fluid overload and hyperviscosity. Patients at risk of complications of fluid overload and hyperviscosity include elderly patients and those with cardiac or renal impairment.

Gammagard Liquid Description

Gammagard Liquid is a ready-for-use sterile, liquid preparation of highly purified and concentrated immunoglobulin G (IgG) antibodies. The distribution of the IgG subclasses is similar to that of normal plasma. The Fc and Fab functions are maintained in Gammagard Liquid. Pre-kallikrein activator activity is not detectable. Gammagard Liquid contains 100 mg/mL protein. At least 98% of the protein is immune globulin, the average immunoglobulin A (IgA) concentration is 37 μg/mL, and immunoglobulin M is present in trace amounts. Gammagard Liquid contains a broad spectrum of IgG antibodies against bacterial and viral agents. Glycine (0.25M) serves as a stabilizing and buffering agent, and there are no added sugars, sodium or preservatives. The pH is 4.6 to 5.1. The osmolality is 240 to 300 mOsmol/kg, which is similar to physiological osmolality (285 to 295 mOsmol/kg). 

Gammagard Liquid is manufactured from large pools of human plasma. IgG preparations are purified from plasma pools using a modified Cohn-Oncley cold ethanol fractionation process, as well as cation and anion exchange chromatography.

Screening against potentially infectious agents begins with the donor selection process and continues throughout plasma collection and plasma preparation. Each individual plasma donation used in the manufacture of Gammagard Liquid is collected only at FDA approved blood establishments and is tested by FDA licensed serological tests for Hepatitis B Surface Antigen (HBsAg), and for antibodies to Human Immunodeficiency Virus (HIV-1/HIV-2) and Hepatitis C Virus (HCV) in accordance with U.S. regulatory requirements. As an additional safety measure, mini-pools of the plasma are tested for the presence of HIV-1 and HCV by FDA licensed Nucleic Acid Testing (NAT) and found to be negative.

To further improve the margin of safety, three dedicated, independent and effective virus inactivation/removal steps have been integrated into the manufacturing and formulation processes, namely solvent/detergent (S/D) treatment7, 35 nm nanofiltration,  and a low pH incubation at elevated temperature 30°C to 32°C. The S/D process includes treatment with an organic mixture of tri-n-butyl phosphate, octoxynol 9 and polysorbate 80 at 18°C to 25°C for a minimum of 60 minutes. S/D treatment inactivates the lipid-enveloped viruses investigated to below detection limits within minutes.

In vitro virus spiking studies have been used to validate the capability of the manufacturing process to inactivate and remove viruses. To establish the minimum applicable virus clearance capacity of the manufacturing process, these virus clearance studies were performed under extreme conditions (e.g., at minimum S/D concentrations, incubation time and temperature for the S/D treatment).

Virus clearance studies for Gammagard Liquid performed in accordance with good laboratory practices are summarized in Table 10.

Table 10. Three Dedicated Independent Virus Inactivation/Removal Steps Mean Log10 Reduction Factors* (RFs) For Each Virus and Manufacturing Step
*
For the calculation of these RF data from virus clearance study reports, applicable manufacturing conditions were used. Log10 RFs on the order of 4 or more are considered effective for virus clearance in accordance with the Committee for Medicinal Products for Human Use (CHMP, formerly CPMP) guidelines.
No RF obtained due to immediate neutralization of HAV by the anti-HAV antibodies present in the product.
Virus type

Enveloped

RNA
Enveloped DNA

Non-enveloped

RNA

Non-enveloped

DNA
Family Retroviridae Flaviviridae Herpesviridae Picornaviridae Parvoviridae
Virus HIV-1 BVDV WNV PRV HAV EMCV MMV
SD treatment >4.5 >6.2 n.a. >4.8 n.d. n.d. n.d
35 nm nanofiltration >4.5 >5.1 > 6.2 >5.6 5.7 1.4 2.0
Low pH treatment >5.8 >5.5 > 6.0 >6.5 n.d. > 6.3 3.1
Overall log reduction factor (ORF) >14.8 >16.8 >12.2 >16.9 5.7 b >7.7 5.1

Abbreviations: HIV-1, Human Immunodeficiency Virus Type 1; BVDV, Bovine Viral Diarrhea Virus (model for Hepatitis C Virus and other lipid enveloped RNA viruses); WNV, West Nile Virus; PRV, Pseudorabies Virus (model for lipid enveloped DNA viruses, including Hepatitis B Virus); EMCV, Encephalomyocarditis Virus (model for non-lipid enveloped RNA viruses, including Hepatitis A virus [HAV]); MMV, Mice Minute Virus (model for non-lipid enveloped DNA viruses, including B19 virus [B19V]); n.d. (not done), n.a. (not applicable).

Gammagard Liquid - Clinical Pharmacology

Mechanism of Action

Gammagard Liquid supplies a broad spectrum of opsonizing and neutralizing IgG antibodies against a wide variety of bacterial and viral agents. Gammagard Liquid also contains a spectrum of antibodies capable of interacting with and altering the activity of cells of the immune system as well as antibodies capable of reacting with cells such as erythrocytes. The role of these antibodies and the mechanisms of action of IgG in Gammagard Liquid have not been fully elucidated.

Pharmacokinetics

Intravenous Administration

Following intravenous infusion, IGIV products show a biphasic decay curve. The initial (α) phase is characterized by an immediate post-infusion peak in serum IgG and is followed by rapid decay due to equilibration between the plasma and extravascular fluid compartments. The second (β) phase is characterized by a slower and constant rate of decay. The commonly cited “normal” half-life of 18 to 25 days is based on studies in which tiny quantities of radiolabeled IgG are injected into healthy individuals.  When radiolabeled IgG was injected into patients with hypogammaglobulinemia or agammaglobulinemia, highly variable half-lives ranging from 12 to 40 days were observed.     In other radiolabeled studies, high serum concentrations of IgG, and hypermetabolism associated with fever and infection, have been seen to coincide with a shortened half-life of IgG.

In contrast, however, pharmacokinetic studies in immunodeficient patients are based on the decline of IgG concentrations following infusions of large quantities of immune globulin. In such trials, investigators have reported uniformly prolonged half-lives of 26 to 35 days. Pharmacokinetic parameters for Gammagard Liquid were determined from total IgG levels following the fourth infusion in 61 subjects with primary humoral immunodeficiency treated intravenously with the product every 3 or 4 weeks according to the regimen used prior to entering the study. Of these, 57 had sufficient pharmacokinetic data to be included in the dataset. The median weight-adjusted dose per subject was 455 mg/kg/4 weeks with a range of 262 to 710. Pharmacokinetic parameters are presented in Table 11.

Table 11. Summary of Intravenous Pharmacokinetic Parameters in 57 Subjects
Parameter Median 95% Confidence Interval
Dose of IgG (mg/kg/4 weeks) 455 Range: 262-710
Elimination Half-Life ( T ½ days) 35 (31, 42)
AUC0-21d (mg·days/dL) 29139 (27494, 30490)
Cmax (Peak, mg/dL) 2050 (1980, 2200)
Cmin (Trough, mg/dL) 1030 (939, 1110)
Incremental recovery (mg/dL)/(mg/kg) 2.3 (2.2, 2.6)

Abbreviations: AUC = area under the curve;

Cmax = maximum concentration; Cmin = minimum concentration.

Median IgG trough levels were maintained between 960 to 1120 mg/dL. These dosing regimens maintained serum trough IgG levels generally considered adequate to prevent bacterial infections. The elimination half-life of Gammagard Liquid of 35 days was similar to the half-lives reported for other IGIV products. 

Subcutaneous Administration

Pharmacokinetic (PK) parameters of subcutaneously administered Gammagard Liquid were evaluated in subjects with primary immunodeficiency (PI) who were 12 years and older during a clinical study (see CLINICAL STUDIES [14]). Subjects were treated intravenously for 12 weeks with Gammagard Liquid and then switched to weekly subcutaneous Gammagard Liquid infusions. Initially, all subjects were treated for a minimum of 12 weeks at a subcutaneous dose that was 130% of the intravenous dose. A comparison of the area under the curve (AUC) for intravenous and subcutaneous infusions done on the first 15 adult subjects determined that the subcutaneous dose required to provide an exposure from subcutaneous administration that was not inferior to the exposure from intravenous administration was 137% of the intravenous dose. Subsequently, all subjects were treated with this dose for 6 weeks after which the dose was individualized for all subjects using the trough IgG levels, as described below. After a minimum of 8 weeks at this subcutaneous dose, the PK evaluation was conducted on 32 subjects 12 years of age or older.

The mean adjusted dose at the end of the study was 137.3% (125.7-150.8) of the intravenous dose for subjects 12 years and older, and 141.0% (100.5 to 160.0) for subjects under the age of 12. Thus, there was not a significant dosing difference required for children. At this dose adjustment, the geometric mean ratio of the AUC for subcutaneous vs. intravenous Gammagard Liquid administration was 95.2% (90% confidence limit 92.3 to 98.2).  The peak IgG level occurred 2.9 (1.2 to 3.2) days after subcutaneous administration.

The pharmacokinetic parameters of Gammagard Liquid administered intravenously compared to subcutaneously in the clinical trial are shown in Table 12.  The mean peak IgG levels were lower (1393 ± 289 mg/dL) during subcutaneous treatment with Gammagard Liquid compared to when it was administered intravenously (2240 ± 536 mg/dL), consistent with the lower weekly dose compared to the dose administered every 3 or 4 weeks intravenously. In contrast, the mean trough levels were higher with Gammagard Liquid given subcutaneously (1202 ± 282 mg/dL), compared to those when given intravenously (1050 ± 260 mg/dL), a result of both higher monthly dose and more frequent dosing. The median IgG trough level during intravenous treatment in this clinical trial, 1010 mg/dL (95% CI: 940-1240), was similar to the median value of 1030 mg/dL (95% CI: 939 to 1110) during the intravenous clinical trial shown above in Table 11. By contrast, the median trough IgG level during subcutaneous treatment for the study was higher, at 1260 mg/dL (95% CI: 1060 to 1400).

Table 12. Pharmacokinetic Parameters of Subcutaneously Administered Gammagard Liquid Compared to Gammagard Liquid Administered Intravenously
*
Weekly equivalent dose
Standardized to a 7 day interval
    Subcutaneous Administration Intravenous Administration
Number of Subjects 32 32
Dose * (mg/kg)
  Mean ±SD 182.6 ± 48.4 133.2 ± 36.9
Range (min to max) 94.2 to 293.8 62.7 to 195.4
IgG Peak Levels (mg/dL)
  Mean ± SD 1393 ± 289 2240 ± 536
  Range (min to max) 734 to 1900 1130 to 3610
IgG Trough Levels (mg/dL)
  Mean ± SD 1202 ± 282 1050 ± 260
  Range (min to max) 621 to 1700 532 to 1460
AUC (days*mg/dL)
  Mean ± SD 9176 ± 1928 9958 ± 2274
  Range (min to max) 4695 to 12468 5097 to 13831
Clearance [mL/kg/day]
Mean ± SD 2.023 ± 0.528 1.355 ± 0.316
Range (min to max) 1.225 to 3.747 0.880 to 2.340

Clinical Studies

Clinical Study of Intravenous Administration

Intravenous use of Gammagard Liquid in patients with PI is supported by the Phase 3 clinical study of subjects who were treated with 300 to 600 mg/kg every 21 to 28 days for 12 months. The 61 subjects in this study were between 6 to 72 years of age, 54% female and 46% male, and 93% Caucasian, 5% African-American, and 2% Asian. Three subjects were excluded from the per-protocol analysis due to non-study product related reasons. The annualized rate of specified acute serious bacterial infections, i.e., the mean number of specified acute serious bacterial infections per subject per year  was studied (see Table 13).

Table 13. Summary of Validated Acute Serious Bacterial Infections for the Per-Protocol Analysis
*
Serious acute bacterial infections were defined by FDA and met specific diagnostic requirements.
The rate of validated infections was compared with a rate of 1 per subject per year, in accordance with recommendations by the FDA Blood Products Advisory Committee
  Number of
Events
Validated Infections*
Bacteremia / Sepsis 0
Bacterial Meningitis 0
Osteomyelitis / Septic Arthritis 0
Bacterial Pneumonia 0
Visceral Abscess 0
Total 0
Hospitalizations Secondary to Infection 0
Mean Number of Validated Infections per Subject per Year 0
p-value p < 0.0001
95% Confidence Interval (0.000, 0.064)

The annualized rate of other specified validated bacterial infections (see Table 14), and the number of hospitalizations secondary to all validated infectious complications were also studied (see Table 13 and Table 14).

Table 14. Summary of Validated Other Bacterial Infections
*
Other bacterial infections that met specific diagnostic requirements
Number of Events
Validated Infections  *
Urinary Tract Infection 1
Gastroenteritis 1
Lower Respiratory Tract Infection: Tracheobronchitis, Bronchiolitis (Without Evidence of Pneumonia) 0
Lower Respiratory Tract Infection:
Other Infections (e.g., Lung Abscess, Empyema)
0
Otitis Media 2
Total 4
Hospitalizations Secondary to Infection 0
Mean Number of Validated Infections per Subject per Year 0.07
95% Confidence Interval  (0.018, 0.168)

In this study, there were no validated acute serious bacterial infections in any of the treated subjects. The annualized rate of acute serious bacterial infections was significantly less than

(p < 0.0001) the rate of one infection per year, in accordance with recommendations by the FDA Blood Products Advisory Committee . Four of the 61 subjects reported a total of 4 other specified validated bacterial infections. None were serious or severe, none resulted in hospitalization, and all resolved completely.

The rate of all clinically-defined but non-validated infections was 3.4 infections per patient per year. These consisted primarily of recurrent episodes of commonly observed infections in this patient population - sinusitis, bronchitis, nasopharyngitis, urinary tract infections, and upper respiratory infections.

During the pivotal clinical study, viral safety was assessed by serological screening for HBsAg and antibodies to HCV, HIV-1, and HIV-2 prior to, during, and at the end of the study and by Polymerase Chain Reaction (PCR) tests for HBV, HCV, and HIV-1 genomic sequences prior to and at the end of the study. None of the 61 treated subjects were positive prior to study entry and none converted from negative to positive during the 12-month period of study.

Clinical Study of Subcutaneous (SC) Administration

A prospective, open-label, non-controlled, multi-center study was conducted in the US to determine the efficacy, tolerability and PK of Gammagard Liquid subcutaneous infusion in 49 adult and pediatric subjects with PID. All subjects were treated for 12 weeks with Gammagard Liquid intravenous infusion every 3 or 4 weeks. Subjects who were on intravenous treatment prior to entering the study were switched to Gammagard Liquid at the same dose and frequency. Subjects who were receiving subcutaneous immune globulin were switched to Gammagard Liquid at the intravenous dose they had been given prior to switching to subcutaneous treatment. A PK analysis was performed at the end of the intravenous period in all subjects aged 12 years and older.

One week after the last intravenous infusion, each subject began subcutaneous treatment with Gammagard Liquid at 130% of the weekly equivalent of the intravenous dose for a minimum of 12 weeks. PK data from the first 15 adult subjects were used to determine the dose required to ensure that the IgG exposure with subcutaneous treatment was not inferior to that with intravenous treatment. The median dose determined from these subjects was 137% of the intravenous dose, and subsequently all subjects were treated for a minimum of 6 weeks at this dose. After 6 subcutaneous infusions, a trough IgG level was obtained and used to individually adapt the subcutaneous dose of Gammagard Liquid to compensate for individual variation from the mean value of 137% (See Pharmacokinetics [12.3] and DOSAGE AND ADMINISTRATION [2.1]). All subjects received a minimum of 12 infusions at this individually adapted dose. Following the formal protocol, all subjects continued to receive subcutaneous treatment with Gammagard Liquid until the last subject completed the study. There were 47 subjects treated with 2,294 subcutaneous infusions of Gammagard Liquid: 4 subjects treated for up to 29 weeks, 17 subjects for 30 to 52 weeks, and 26 subjects for 53 weeks or longer. The median duration of subcutaneous treatment was 379 days (range: 57 to 477 days).

Efficacy was determined throughout the entire subcutaneous phase. There were 31 adults 16 years or older, 4 adolescents between 12 and < 16 years of age, and 14 children between 2 years and <12. The volume of Gammagard Liquid infused was 30 mL per site for patients weighing 40 kg and greater, and 20 mL per site for those weighing less than 40 kg. The total weekly dose was divided by those values to determine the number of sites.

Mean weekly subcutaneous doses ranged from 181.9 mg/kg to 190.7 mg/kg (at 130% to 137% of the intravenous dose). In the study, the number of infusion sites per infusion was dependent on the dose of IgG and ranged from 2 to 10. In 75% of infusions, the number of infusion sites was 5 or fewer.

There were 3 serious validated bacterial infections, all bacterial pneumonia. None of these subjects required hospitalization to treat their infection. The annual rate of acute serious bacterial infections while on Gammagard Liquid subcutaneous treatment was 0.067, with an upper 99% confidence limit of 0.133, which is lower than the minimal goal of achieving a rate of <1 bacterial infection per patient-year. 

The summary of infections and associated events for subjects during subcutaneous treatment with Gammagard Liquid is summarized in Table 15. The annual rate of any infection in this study during subcutaneous treatment, including viral and fungal infections, was 4.1 infections per subject per year. This is consistent with the rate of infections observed in other clinical studies of intravenous and subcutaneous immune globulin8,9.

Table 15. Summary of Infections and Associated Events
*
Included systemic and topical antibacterial, anti-fungal, anti-viral, and anti-protozoal antimicrobials.

Number of subjects (efficacy phase)

Total number of subject years

Annual rate of any infections

47

44

4.1 (95% CI 3.2 to 5.1)

infections/subject year
Antibiotic use * (prophylaxis or treatment)

Number of subjects (%)

Annual rate

40 (85.1%)

50.2 (95% CI 33.4 to 71.9) days/subject year
Days out of work/school/day care or unable to perform normal activities

Number of subjects (%)

Annual rate

25 (53.2%)

4.0 (95% CI 2.5 to 6.1)

days/subject year

Hospitalizations due to infections

Number of subjects (%)

Annual rate

0 (0.0%)

0.0 (95% CI 0.0 to 0.1)

days/subject year

REFERENCES

  1. Orange JS, Hossny EM, Weiler CR, Ballow M, Berger M, Bonilla FA, Buckley R, Chinen J, El-Gamal Y, Mazer BD, Nelson Jr. RP, Patel DD, Secord E, Sorenson RU, Wasserman RL, Cunningham-Rundles C, Use of Intravenous Immunoglobulin in Human Disease: A Review of Evidence by Members of the Primary Immunodeficiency Committee of the American Academy of Allergy, Asthma, and Immunology. J Allergy Clin Immunol 2006; 117:S525-53.
  2. Bonilla FA, Bernstein IL, Khan DA, Ballas ZK, Chinen J, Frank MM, et al. Practice parameter for the diagnosis and management of primary immunodeficiency. Ann Allergy Asthma Immunol. 2005; 94(suppl 1):S1-63.
  3. Pierce LR, Jain N. Risks associated with the use of intravenous immunoglobulin. Transfusion Med Rev. 2003;17:241-251.
  4. Katz U, Sheonfeld Y. Review: intravenous immunoglobulin therapy and thromboembolic complications. Lupus 2005;14:802-8
  5. Daw Z, Padmore R, Neurath D, Cober N, Tokessy M, Desjardins D, et al. Hemolytic transfusion reactions after administration of intravenous immune (gamma) globulin: a case series analysis. Transfusion. 2008; 48:1598-601
  6. Church JA, Leibl H, Stein MR, et al. Efficacy, safety and tolerability of a new 10% liquid intravenous immune globulin (IGIV 10%) in patients with primary immunodeficiency. J Clin Immunol 2006; 26(4):388-395.
  7. Kreil TR, Berting A, Kistner O, Kindermann J. West Nile virus and the safety of plasma derivatives: verification of high safety margins, and the validity of predictions based on model virus data. Transfusion 2003;43:1023-1028.
  8. Ochs HD, Gupta S, Kiessling P et al. Safety and efficacy of self-administered subcutaneous immunoglobulin in patients with primary immunodeficiency diseases. J.Clin.Immunol. 2006;26:265-273.
  9. Gardulf A, Nicolay U, Asensio, et al. Rapid subcutaneous IgG replacement therapy is effective and safe in children and adults with primary immunodeficiencies – A prospective, Multi-National Study. J Clin Immunol. 2006; 26:177-85.

How Supplied/Storage and Handling

Gammagard Liquid is supplied in single use bottles containing the labeled amount of functionally active IgG. The packaging of this product is not made with natural rubber latex.

The following presentations of Gammagard Liquid are available:

NDC Number Volume Grams Protein
0944-2700-02 10 mL 1.0
0944-2700-03 25 mL 2.5
0944-2700-04 50 mL 5.0
0944-2700-05 100 mL 10.0
0944-2700-06 200 mL 20.0
0944-2700-07 300 mL 30.0

Do not freeze.

Refrigeration: 36 months storage at temperature 2˚to 8˚C (36˚ - 46˚F).

Room Temperature: 12 months storage at room temperature 25˚C, (77˚F) within the first 24 months of the date of manufacture. See below for detailed storage information.

The total storage time of Gammagard Liquid depends on the point of time the vial is transferred to room temperature. Examples for total storage times are illustrated in Figure 1. The new expiration date must be recorded on the package when the product is transferred to room temperature.

Figure 1 Storage Guidelines Months from Date of Manufacture

Product cannot be stored at room temperature after 24 months from date of manufacture.

  • Example 1: If the product is taken out of the refrigerator after 3 months from date of manufacture, it can be stored for 12 months at room temperature. Total storage time is 15 months.
  • Example 2: If the product is taken out of the refrigerator after 21 months from the date of manufacture, it can be stored for 3 months at room temperature. Total storage time is 24 months.

Patient Counseling Information

See FDA approved patient labeling (Information for Patients) and instructions for use

Inform patients to immediately report the following signs and symptoms to their healthcare provider:

  • Decreased urine output, sudden weight gain, fluid retention/edema, and/or shortness of breath  (see WARNINGS AND PRECAUTIONS [5.2])
  • Acute chest pain, shortness of breath, leg pain, and swelling of the legs/feet, numbness in the face or extremities, weakness or paralysis, severe headache, confusion, visual disturbances

    (see WARNINGS AND PRECAUTIONS [5.4]).

  • Severe headache, neck stiffness, drowsiness, fever, sensitivity to light, painful eye movements, nausea, and vomiting (see WARNINGS AND PRECAUTIONS [5.5]).
  • Increased heart rate, fatigue, yellowing of the skin or eyes, and dark-colored urine (see WARNINGS AND PRECAUTIONS [5.6]).
  • Trouble breathing, chest pain, blue lips or extremities, or fever that can occur 1 to 6 hours after an infusion of Gammagard Liquid (see WARNINGS AND PRECAUTIONS [5.7]).

Prior to starting Gammagard Liquid ask about a history of IgA deficiency, allergic reactions to immune globulin or other blood products. Patients with a history of allergic reactions should not be treated subcutaneously at home until several treatments have been administered and tolerated under medical supervision.

Inform patients that Gammagard Liquid is made from human plasma and may contain infectious agents that can cause disease (e.g., viruses and, theoretically, the vCJD agent). The risk of Gammagard Liquid transmitting an infectious agent has been reduced by screening plasma donors for prior exposure, testing donated plasma, and inactivating or removing certain viruses during manufacturing. Patients should report any symptoms that concern them which might be caused by virus infections (see WARNINGS AND PRECAUTIONS [5.8]).

Inform patients that Gammagard Liquid can interfere with their immune response to live viral vaccines such as measles, mumps, rubella and varicella, and instruct patients to notify their healthcare professional of this potential interaction when they are receiving vaccinations (see DRUG INTERACTIONS [7]).

Subcutaneous (SC) Administration Only

Self-administration – If self-administration is deemed to be appropriate by the physician, clear instructions and training on subcutaneous infusion should be given to the patient/caregiver, and the demonstration of their ability to independently administer subcutaneous infusions should be documented.

  • Ensure the patient understands the importance of consistent weekly subcutaneous infusion to maintain appropriate steady IgG levels.
  • Instruct the patient to keep a treatment diary/log book. This diary/log book should include information about each infusion such as, the time, date, dose, lot number(s) and any reactions.
  • Inform the patient that mild to moderate local infusion-site reactions (e.g., swelling and redness) are a common side effect of subcutaneous treatment, but to contact their healthcare professional if a local reaction increases in severity or persists for more than a few days.

 Patient package insert

Information For Patients

Gammagard Liquid

Immune Globulin Infusion (Human) 10%

For Intravenous and Subcutaneous Administration

Information for Patients

The following summarizes important information about Gammagard Liquid. Please read it carefully before using this medicine. This information does not take the place of talking with your healthcare provider, and it does not include all of the important information about Gammagard Liquid. If you have any questions after reading this, ask your healthcare provider.

What is the most important information I need to know about Gammagard Liquid?

Gammagard Liquid can cause the following serious reactions:

  • Severe allergic reactions causing difficulty in breathing or skin rashes
  • Decreased kidney function or kidney failure
  • Blood clots in the heart, brain, lungs or elsewhere in the body
  • Severe headache, drowsiness, fever, painful eye movements, or nausea and vomiting
  • Dark colored urine, swelling, fatigue, or difficulty breathing

What is Gammagard Liquid?

Gammagard Liquid is a ready-to-use, liquid medicine that contains immunoglobulin G (IgG) antibodies, which protect the body against infection.

Gammagard Liquid is used to treat patients with primary immunodeficiency diseases (PI). There are many forms of PI.  The most common types of PI result in an inability to make a very important type of protein called antibodies, which help the body fight off infections from bacteria or viruses. Gammagard Liquid is made from human plasma that is donated by healthy people. Gammagard Liquid contains antibodies collected from these healthy people that replace the missing antibodies in PI patients.

Who should not use Gammagard Liquid?

Do not use Gammagard Liquid if you have a known history of a severe allergic reaction to immune globulin or other blood products. If you have such a history, discuss this with your healthcare provider to determine if Gammagard Liquid can be given to you. Tell your healthcare provider if you have a condition called selective (or severe) immunoglobulin A (IgA) deficiency.

How should I use Gammagard Liquid?

Gammagard Liquid is given into a vein (intravenously) or under the skin (subcutaneously). Most often infusions into the vein are given every 3 or 4 weeks whereas infusions under the skin are given every week. You and your healthcare provider will decide which way is best for you. Most of the time infusions under the skin are given at home by patients or caregivers. Although it is possible to give yourself infusions into the vein at home they are more often given in a hospital or infusion center by a nurse.

Instructions for giving Gammagard Liquid under the skin (subcutaneously) are provided in the Instructions for Use brochure. Only use Gammagard Liquid by yourself after you have been instructed by your healthcare provider.

What should I avoid while taking Gammagard Liquid?

Gammagard Liquid can make vaccines (like measles/mumps/rubella or chickenpox vaccines) not work as well for you. Before you get any vaccines, tell your healthcare provider that you take Gammagard Liquid.

Tell your healthcare provider if you are pregnant, or plan to become pregnant or if you are nursing.

What are the possible or reasonably likely side effects of Gammagard Liquid?

The following one or more possible reactions may occur at the site of infusion. These generally go away within a few hours, and are less likely after the first few infusions.

  • Mild or moderate pain
  • Redness
  • Swelling
  • Bruising
  • Itching
  • Warmth

During the infusion of Gammagard Liquid, look out for the first signs of the following common side effects:

  • Headache
  • Chills/Shaking chills
  • Migraine
  • Dizziness
  • Fever
  • Nausea/Vomiting
  • Fatigue
  • Faster Heart Rate
  • Itching
  • Upper Abdominal Pain
  • Rash/Hives
  • Increased Blood Pressure
  • Cough

If any of the following problems occur after starting treatment with Gammagard Liquid, stop the infusion immediately and contact your healthcare provider or call emergency services. These could be signs of a serious problem:

  • Hives, swelling in the mouth or throat, itching, trouble breathing, wheezing, fainting or dizziness. These could be signs of a serious allergic reaction.
  • Bad headache with nausea, vomiting, stiff neck, fever, and sensitivity to light. These could be signs of irritation of the lining around your brain.
  • Reduced urination, sudden weight gain, or swelling in your legs. These could be signs of a kidney problem.
  • Pain, swelling, warmth, redness, or a lump in your legs or arms. These could be signs of a blood clot.
  • Brown or red urine, fast heart rate, yellow skin or eyes. These could be signs of a liver problem or a blood problem.
  • Chest pain or trouble breathing, blue lips or extremities. These could be signs of a serious heart or lung problem.
  • Fever over 100°F. This could be a sign of an infection.

These are not all of the possible side effects with Gammagard Liquid. You can ask your healthcare provider for physician’s information leaflet. Tell your healthcare provider about any side effect that bothers you or that does not go away.

Whenever giving yourself treatments at home, you should have another responsible person present to help treat side effects or get help if you have a serious adverse reaction occur. Ask your healthcare provider whether you should have rescue medications, such as antihistamines or epinephrine.

How do I store Gammagard Liquid?

Store vials in their original boxes to protect from light. Do not freeze Gammagard Liquid.

Gammagard Liquid vials can be stored in a refrigerator (36° to 46°F [2° to 8°C]) for 36 months, or at room temperature (up to a maximum of 77°F [25°C]) for up to 12 months within the first 24 months since the date of manufacture. Check the box for the date of manufacture.

  1. Example 1: If Gammagard Liquid is taken out of the refrigerator 3 months after the date of manufacture, it can be stored for 12 months at room temperature. Total storage time is 15 months.
  2. Example 2: If Gammagard Liquid is taken out of the refrigerator 21 months after the date of manufacture, it can be stored for 3 additional months at room temperature. Total storage time is 24 months.

If you store Gammagard Liquid at room temperature:

  • Note the date that Gammagard Liquid is removed from refrigeration on the box. Do not use after 12 months from this date or the expiration date listed on the vial, whichever is earlier.
  • After you remove Gammagard Liquid from the refrigerator and store it at room temperature, do not refrigerate again.

Always check the expiration date printed on the box. You should not use the product after the expiration date.

Resources at Baxter Available to the Patients:

For more information on patient resources, education, or insurance assistance please visit http://www.immunedisease.com. 

 

Detailed Instructions for Subcutaneous Administration

 Do not begin subcutaneous treatment with Gammagard Liquid until you have received instructions as detailed above and are comfortable that you can perform all the steps on your own.

1. If refrigerated, remove Gammagard Liquid from refrigerator- remove the product box from the refrigerator and take the vial out of the box.

Allow vials to reach room temperature.  This may take up to 60 minutes. 

Do not heat up the product or shake the product.

If stored at room temperature, take the vial out of the box.

Check:

  • Expiration date. Do not use beyond expiration date.
  • Vial to see if it is clear and colorless to light yellow. If it is cloudy or has particles, do not use.
  • Protective cap is on the vial. Do not use the product if it does not have the cap.
Repeat this step with as many boxes of Gammagard Liquid as necessary.
2. Gather all supplies – Collect all the items you will need for the infusion: vial(s) of Gammagard Liquid, infusion supplies (needle sets, transfer needles, alcohol swabs, syringes, gauze, and tape), sharps container, infusion pump, and treatment logbook.
3. Prepare a clean work area- Clean a work area with an antibacterial cleaner and place all gathered items on the clean surface. Find a quiet work area with as few distractions as possible.

4. Wash hands- Wash your hands thoroughly. Put on clean gloves if your health care provider has instructed you to wear them.

5. Gammagard Liquid preparation- If Gammagard Liquid is received in a bag or syringe, skip to step 7.

Remove the cap from the vial. Wipe the vial stopper with an alcohol swab and allow to air dry (at least 30 seconds).

6. Fill syringe from Gammagard Liquid vial(s) – Remove sterile syringe from package and attach to a sterile needle. Pull back on plunger of the syringe to fill it with air, which should equal the amount of liquid you will be taking from the vial. Insert needle into the center of the vial stopper. Inject air into the vial and withdraw Gammagard Liquid into the syringe. (Example: If withdrawing 50 mL of Gammagard Liquid, inject 50 mL of air into the vial).

If multiple vials are required to achieve the desired dose, repeat this step.

If using a vented spike, it is not necessary to inject air into the vial with the syringe. Attach a sterile syringe to the spike, insert the spike into the center of the stopper, and pull back on the plunger to withdraw the desired volume.

7. Prepare the infusion pump and tubing – If using a syringe driver pump, attach the syringe filled with Gammagard Liquid to the needle set.  On a hard surface, gently push down on the plunger  to fill (prime) the pump tubing up to the needle hub. This will ensure that no air is left in the tubing and needle (see picture).

If using a portable pump with Gammagard Liquid in a bag, follow manufacturer’s instructions for preparing the pump and administration tubing, if needed.

8. Select the infusion sites - Select the number of infusion sites based on the volume of the total dose. It is recommended that you not inject more than 20 mL for children and 30 mL for adults into each infusion site.

See figure for potential locations of infusion sites (e.g., upper arms, abdomen, thighs, and lower back). Make sure sites are at least 2 inches apart. Avoid bony areas, visible blood vessels, scars and areas of inflammation (irritation) or infection.

9. Clean the infusion site(s)- Clean the infusion site(s) with an alcohol swab. Allow to dry (at least 30 seconds).

10. Insert the needle – Remove the needle cover. Firmly grasp skin and pinch at least one inch of skin between two fingers. Insert needle with a rapid motion straight into the skin at a 90 degree angle. Tape the needle in place. Repeat this step for each infusion site.

11. Check for proper needle placement – Before starting the infusion, check each needle for correct placement by gently pulling back on the attached syringe plunger and looking for any blood in the needle tubing. If you see any blood, remove and throw away the needle into the sharps container. Repeat filling (priming) and needle insertion steps in a different infusion site with a new needle.

12. Secure the needle to the skin and start infusion - Secure the needle(s) in place by putting a sterile clear bandage over the needle.

Follow the manufacturer’s instructions to turn pump on. Check infusion sites occasionally throughout the infusion.

13. Remove needle set – After the infusion is complete, remove the needle set by pulling it straight out. Gently press a small piece of gauze over the needle site and cover with a protective dressing.

Throw away any unused product in the vial and the disposable supplies into the sharps container. Dispose of the sharps container using instructions provided with the container, or contact your healthcare provider.

14. Record the infusion - Remove the peel-off label from Gammagard Liquid vial, which has the product lot number and expiration date, and place the label in your treatment diary/log book. Write down the date, time, dose, and any reactions after each infusion.

Baxter and Gammagard Liquid are trademarks of Baxter International Inc.

Baxter Healthcare Corporation

Westlake Village, CA 91362 USA

U.S. License No. 140

Principal Display Panel

Gammagard Liquid 10g Vial Label

Immune Globulin Infusion (Human) 10%

Gammagard Liquid

Solution for Infusion

Refrigeration: 36 months storage at refrigerated temperature 2˚ -8˚C (36˚ F -46˚ F).

Do Not Freeze.

Room temperature: 12 months storage at room temperature 25˚ C (77˚ F) within the first

24 months from the date of manufacture. See package insert for detailed storage information.

Made with no natural rubber latex.

For Intravenous or Subcutaneous Administration.

Rx Only

U.S. License No. 140

Baxter Healthcare Corporation,

Westlake Village, CA 91362 USA

Gammagard Liquid 10g Unit Carton

NDC 0944-2700-05

Immune Globulin Infusion

(Human) 10%

Gammagard Liquid

Solution for Infusion

Gammagard Liquid 
human immunoglobulin g injection, solution
Product Information
Product Type HUMAN PRESCRIPTION DRUG LABEL Item Code (Source) NDC:0944-2700
Route of Administration INTRAVENOUS, SUBCUTANEOUS DEA Schedule     
Active Ingredient/Active Moiety
Ingredient Name Basis of Strength Strength
HUMAN IMMUNOGLOBULIN G (HUMAN IMMUNOGLOBULIN G) HUMAN IMMUNOGLOBULIN G 100 mg  in 1 mL
Inactive Ingredients
Ingredient Name Strength
GLYCINE  
Packaging
# Item Code Package Description
1 NDC:0944-2700-02 1 BOTTLE, GLASS (BOTTLE) in 1 CARTON
1 10 mL in 1 BOTTLE, GLASS
2 NDC:0944-2700-03 1 BOTTLE, GLASS (BOTTLE) in 1 CARTON
2 25 mL in 1 BOTTLE, GLASS
3 NDC:0944-2700-04 1 BOTTLE, GLASS (BOTTLE) in 1 CARTON
3 50 mL in 1 BOTTLE, GLASS
4 NDC:0944-2700-05 1 BOTTLE, GLASS (BOTTLE) in 1 CARTON
4 100 mL in 1 BOTTLE, GLASS
5 NDC:0944-2700-06 1 BOTTLE, GLASS (BOTTLE) in 1 CARTON
5 200 mL in 1 BOTTLE, GLASS
6 NDC:0944-2700-07 1 BOTTLE, GLASS (BOTTLE) in 1 CARTON
6 300 mL in 1 BOTTLE, GLASS
Marketing Information
Marketing Category Application Number or Monograph Citation Marketing Start Date Marketing End Date
BLA BLA125105 08/29/2011
Labeler - Baxter Healthcare Corporation (039121363)
Establishment
Name Address ID/FEI Operations
Baxter SA 370191025 MANUFACTURE
Revised: 07/2011
 
Baxter Healthcare Corporation
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