Interferon alfacon-1

Interferon alfacon-1
Adult Indications & Dosage
Pediatric Indications & Dosage
Contraindications
Warnings & Precautions
Adverse Reactions
Drug Interactions
Use in Specific Populations
Administration & Monitoring
Overdosage
Pharmacology
Clinical Studies
How Supplied
Images
Patient Counseling Information
Precautions with Alcohol
Brand Names
Look-Alike Names

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Rabin Bista, M.B.B.S. [2]

Disclaimer

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Overview

Interferon alfacon-1 is a Immunological Agent that is FDA approved for the treatment of INFERGEN is indicated for the treatment of chronic HCV infection in patients 18 years of age or older with compensated liver disease who have anti-HCV serum antibodies and/or the presence of HCV RNA. Other causes of hepatitis, such as viral hepatitis B or autoimmune hepatitis, should be ruled out prior to initiation of therapy with INFERGEN. In some patients with chronic HCV infection, INFERGEN normalizes serum ALT, reduces serum HCV RNA concentrations to undetectable quantities (< 100 copies/mL), and improves liver histology.. Common adverse reactions include Injection site reactions, fatigue, fever, rigors, body pain.

Adult Indications and Dosage

FDA-Labeled Indications and Dosage (Adult)

Indications

INFERGEN is indicated for the treatment of chronic HCV infection in patients 18 years of age or older with compensated liver disease who have anti-HCV serum antibodies and/or the presence of HCV RNA. Other causes of hepatitis, such as viral hepatitis B or autoimmune hepatitis, should be ruled out prior to initiation of therapy with INFERGEN. In some patients with chronic HCV infection, INFERGEN normalizes serum ALT, reduces serum HCV RNA concentrations to undetectable quantities (< 100 copies/mL), and improves liver histology.

Dosage

The recommended dose of INFERGEN for treatment of chronic HCV infection is 9 mcg TIW administered SC as a single injection for 24 weeks. At least 48 hours should elapse between doses of INFERGEN. (SeeILLUSTRATED MEDICATION GUIDE for instructions.)

Patients who tolerated previous interferon therapy and did not respond or relapsed following its discontinuation may be subsequently treated with 15 mcg of INFERGEN TIW administered SC as a single injection for up to 48 weeks. (SeeILLUSTRATED MEDICATION GUIDE for instructions.)

There are significant differences in specific activities among interferons. Healthcare providers should be aware that changes in interferon brand may require adjustments of dosage and/or change in route of administration. Patients should be warned not to change brands of interferon without medical consultation. Patients should also be instructed by their physician not to reduce the dosage of INFERGEN prior to medical consultation.

Dose Reduction For patients who experience a severe adverse reaction on INFERGEN, dosage should be withheld temporarily. If the adverse reaction does not become tolerable, therapy should be discontinued. Dose reduction to 7.5 mcg may be necessary following an intolerable adverse event. In the pivotal study, 11% of patients (26/231) who initially received INFERGEN at a dose of 9 mcg (0.3 mL) were dose-reduced to 7.5 mcg (0.25 mL).

If adverse reactions continue to occur at the reduced dosage, the physician may discontinue treatment or reduce dosage further. However, decreased efficacy may result from continued treatment at dosages below 7.5 mcg.

During subsequent treatment for 48 weeks with 15 mcg of INFERGEN, up to 36% of patients required dose reductions in 3 mcg increments.

Administration of INFERGEN If home use is determined to be desirable by the physician, instructions on appropriate use should be given by a healthcare professional. After administration of INFERGEN, it is essential to follow the procedure for proper disposal of syringes and needles. See theMEDICATION GUIDE for detailed instructions.

Storage Just prior to injection, INFERGEN may be allowed to reach room temperature.

Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration; if particulates or discoloration are observed, the container should not be used.

Off-Label Use and Dosage (Adult)

Guideline-Supported Use

There is limited information regarding Off-Label Guideline-Supported Use of Interferon alfacon-1 in adult patients.

Non–Guideline-Supported Use

There is limited information regarding Off-Label Non–Guideline-Supported Use of Interferon alfacon-1 in adult patients.

Pediatric Indications and Dosage

FDA-Labeled Indications and Dosage (Pediatric)

• Safety and effectiveness has not been established on pediatric patients

Off-Label Use and Dosage (Pediatric)

Guideline-Supported Use

There is limited information regarding Off-Label Guideline-Supported Use of Interferon alfacon-1 in pediatric patients.

Non–Guideline-Supported Use

There is limited information regarding Off-Label Non–Guideline-Supported Use of Interferon alfacon-1 in pediatric patients.

Contraindications

• known hypersensitivity to alpha interferons or to any component of the product

decompensated hepatic disease

autoimmune hepatitis

Warnings

Treatment with INFERGEN should be administered under the guidance of a qualified physician, and may lead to moderate-to-severe adverse experiences requiring dose reduction, temporary dose cessation, or discontinuation of further therapy.

Withdrawal from study for adverse events occurred in 7% of patients initially treated with 9 mcg INFERGEN (including 4% due to psychiatric events). Withdrawal from study due to adverse events occurred in 5% of patients subsequently treated with 15 mcg INFERGEN for 24 weeks and 11% of patients subsequently treated with 15 mcg INFERGEN for 48 weeks.

Neuropsychiatric Disorders Severe psychiatric adverse events may manifest in patients receiving therapy with alpha interferons, including INFERGEN. Depression, suicidal ideation, suicide attempt, and suicide may occur. Other prominent psychiatric adverse events may also occur, including psychosis, aggressive behavior, nervousness, anxiety, emotional lability, abnormal thinking, agitation, apathy and relapse of drug addiction. INFERGEN should be used with extreme caution in patients who report a history of depression. Physicians should monitor all patients for evidence of depression and other psychiatric symptoms. Prior to initiation of INFERGEN therapy, physicians should inform patients of the possible development of depression and patients should be advised to immediately report any sign or symptom of depression and/or suicidal ideation. In severe cases, therapy should be stopped immediately and psychiatric intervention instituted (SeeDOSAGE AND ADMINISTRATION: DOSE REDUCTION).

Bone Marrow Toxicity Alpha interferons suppress bone marrow function and may result in severe cytopenias including very rare events of aplastic anemia. It is advised that complete blood counts be obtained pretreatment and monitored routinely during therapy. Alpha interferon therapy should be discontinued in patients who develop severe decreases in neutrophil (<0.5 x 109/L) or platelet counts (<50 x 109/L).

Cardiovascular Disorders Hypertension, tachycardia, palpitation, and tachyarrhythmias have been reported in patients treated with INFERGEN. INFERGEN should be administered with caution to patients with preexisting cardiac disease. Supraventricular arrhythmias, chest pain, and myocardial infarction have been associated with alpha interferon therapies.8

Hypersensitivity Serious acute hypersensitivity reactions have been reported in rare instances following treatment with alpha interferons. If hypersensitivity reactions occur (e.g., urticaria, angioedema, bronchoconstriction, anaphylaxis), INFERGEN should be discontinued immediately and appropriate medical treatment instituted.

Endocrine Disorders INFERGEN should be administered with caution to patients with a history of endocrine disorders. Occurrence or aggravation of hyperthyroidism or hypothyroidism have been reported with INFERGEN. Hyperglycemia and diabetes mellitus have also been observed in patients treated with INFERGEN. Patients who develop these conditions during treatment that cannot be controlled with medication should not continue INFERGEN therapy.

Autoimmune Disorders Development of or exacerbation of autoimmune disorders (e.g., autoimmune thrombocytopenia, idiopathic thrombocytopenic purpura, psoriasis, rheumatoid arthritis) have been reported in patients receiving alpha interferon therapies, including INFERGEN. INFERGEN should not be used in patients with autoimmune hepatitis (seeCONTRAINDICATIONS) and should be used with caution in patients with other autoimmune disorders.

Pulmonary Disorder Pneumonia and interstitial pneumonitis, some resulting in respiratory failure and/or patient deaths, have been induced or aggravated by alpha interferon therapy, including INFERGEN. Patients who develop persistent or unexplained pulmonary infiltrates or pulmonary function impairment should discontinue treatment with INFERGEN.

Colitis Hemorrhagic/ischemic colitis, sometimes fatal, has been observed within 12 weeks of alpha interferon therapies and has been reported in patients treated with INFERGEN. INFERGEN treatment should be discontinued immediately in patients who develop signs and symptoms of colitis.

Pancreatitis Pancreatitis, sometimes fatal, has been observed in patients treated with alpha interferons, including INFERGEN. INFERGEN should be suspended in patients with signs and symptoms suggestive of pancreatitis and discontinued in patients diagnosed with pancreatitis.

Hepatic Exacerbations and Decompensated Hepatic Disease Chronic hepatitis C patients with cirrhosis may be at risk of hepatic decompensation when treated with alpha interferons, including INFERGEN. During treatment, patients’ clinical status and hepatic function should be closely monitored, and INFERGEN treatment should be immediately discontinued if symptoms of hepatic decompensation, such as jaundice, ascites, coagulopathy, or decreased serum albumin, are observed (seeCONTRAINDICATIONS).

Ophthalmologic Disorders Decrease or loss of vision, retinopathy including macular edema, retinal artery or vein thrombosis, retinal hemorrhages and cotton wool spots; optic neuritis, and papilledema are induced or aggravated by treatment with INFERGEN or other alpha interferons. All patients should receive an eye examination at baseline. Patients with preexisting ophthalmologic disorders (e.g., diabetic or hypertensive retinopathy) should receive periodic ophthalmologic exams during interferon alpha treatment. Any patient who develops ocular symptoms should receive a prompt and complete eye examination. INFERGEN therapy should be discontinued in patients who develop new or worsening ophthalmologic disorders.

Cerebrovascular Disorders Ischemic and hemorrhagic cerebrovascular events have been observed in patients treated with interferon alfa-based therapies, including INFERGEN. Events occurred in patients with few or no reported risk factors for stroke, including patients less than 45 years of age. Because these are spontaneous reports, estimates of frequency cannot be made and a causal relationship between interferon alfa-based therapies and these events is difficult to establish.

Precautions

General While fever may be related to the flu-like symptoms reported in patients treated with INFERGEN, when fever occurs, other possible causes of persistent fever should be ruled out.

Bone Marrow Toxicity INFERGEN should be used cautiously in patients with abnormally low peripheral blood cell counts or who are receiving agents that are known to cause myelosuppression. Transplantation patients or other chronically immunosuppressed patients should receive alpha interferon therapy with caution.

Renal Impairment Increases in serum creatinine levels, and rarely renal failure, have been observed in patients receiving INFERGEN. INFERGEN has not been studied in patients with renal insufficiency. Patients with impaired renal function should be closely monitored and INFERGEN should be used with caution in patients with renal insufficiency.

Laboratory Tests Laboratory tests are recommended for all patients on INFERGEN therapy, prior to beginning treatment (baseline), 2 weeks after initiation of therapy, and periodically thereafter during the 24 or 48 weeks of therapy at the discretion of the physician. Following completion of INFERGEN therapy, any abnormal test values should be monitored periodically. The entrance criteria that were used for the clinical study of INFERGEN may be considered as a guideline to acceptable baseline values for initiation of treatment:

Platelet count ≥ 75 x 109/L

Hemoglobin concentration ≥ 100 g/L

ANC ≥ 1500 x 106/L

Serum creatinine concentration < 180 μmol/L (< 2.0 mg/dL) or creatinine clearance > 0.83 mL/second (> 50 mL/minute)

Serum albumin concentration ≥ 25 g/L

Bilirubin within normal limits

TSH and T4 within normal limits

Neutropenia, thrombocytopenia, hypertriglyceridemia, and thyroid disorders have been reported with administration of INFERGEN (seeADVERSE REACTIONS). Therefore, these laboratory parameters should be monitored closely.

Adverse Reactions

Clinical Trials Experience

Adverse experiences that were reported, regardless of attribution to treatment, in at least 5% of patients in the 9 mcg INFERGEN or 3 MIU IFN α-2b groups of the pivotal study are presented in TABLE 3, listed in decreasing order by the 9 mcg INFERGEN group. The incidence of adverse events is expressed based on the number of patients experiencing each event at least once during treatment or during posttreatment observation.

Most adverse events were mild-to-moderate in severity and abated with cessation of therapy. Flu-like symptoms (i.e., headache, fatigue, fever, rigors, myalgia, sweating increased, and arthralgia) were the most frequently reported treatment-related adverse reactions. Most were short-lived and could be treated symptomatically.

Depression, usually mild-to-moderate in severity, was reported in 26% of patients who received 9 mcg INFERGEN and was the most common adverse event resulting in study drug discontinuation.

In patients who had tolerated previous interferon therapy (9 mcg INFERGEN or 3 MIU IFN α-2b) and failed to normalize ALT, or who had achieved normalization of ALT during the treatment period but who relapsed during the posttreatment observation period, subsequent treatment with 15 mcg TIW of INFERGEN for 24 or 48 weeks was generally tolerated. Adverse experiences of patients receiving subsequent treatment, regardless of attribution to treatment, are reported in TABLE 3. The higher dose of INFERGEN used in these patients was associated with a greater incidence of leukopenia and granulocytopenia. One or more dose reductions for all causes were required in up to 36% of patients. Patients who do not tolerate initial standard interferon therapy should not receive therapy with 15 mcg TIW of INFERGEN.

Laboratory Values The following laboratory values were found to be affected by therapy with INFERGEN in the 231 patients who received treatment with 9 mcg INFERGEN.

Hemoglobin and Hematocrit: Treatment with INFERGEN was associated with gradual decreases in mean values for hemoglobin and hematocrit, which were 4% and 5% below baseline at the end of treatment. Decreases from baseline of 20% or more in hemoglobin or hematocrit were seen in 1% of patients or less.

White Blood Cells: INFERGEN treatment was associated with decreases in mean values for both total white blood cell (WBC) count and ANC within the first 2 weeks of treatment. By the end of treatment, mean decreases from baseline of 19% for WBCs and 23% for ANC were observed. These effects reversed during the posttreatment observation period. In 2 INFERGEN-treated patients in the phase 3 trial, decreases in ANC to levels below 500 x 106 cells/L were seen. In both cases, the ANC returned to clinically acceptable levels with reduction of the dose of INFERGEN, and these transient decreases in neutrophils were not associated with infections.

Platelets: INFERGEN treatment was associated with alterations in platelet count. Decreases in mean platelet count of 16% compared to baseline were seen by the end of treatment. These decreases were reversed during the posttreatment observation period. Values below normal were common during treatment with 3% of patients developing values less than 50 x 109 cells/L, usually necessitating dose reduction.

Triglycerides: Mean values for serum triglyceride increased shortly after the start of administration of INFERGEN, with increases of 41%, compared with baseline, at the end of the treatment period. Seven percent of the patients developed values which were at least 3 times above pretreatment levels during treatment. This effect was promptly reversed after discontinuation of treatment.

Thyroid Function: INFERGEN treatment was associated with biochemical changes consistent with hypothyroidism including increases in TSH and decreases in T4 mean values. Increases in TSH to greater than 7 mU/L were seen in 10% of 9 mcg INFERGEN-treated patients either during the treatment period or the 24-week posttreatment observation period. Thyroid supplements were instituted in approximately one-third of these patients.

Laboratory Values for Subsequent Treatment: From a database of 165 patients receiving subsequent treatment with 15 mcg of INFERGEN for 24 weeks, and 168 patients receiving subsequent treatment with 15 mcg of INFERGEN for 48 weeks after failing initial interferon therapy, similar changes in the laboratory values as outlined above were observed. Mean decreases from baseline up to 23% for WBCs and up to 27% for ANC were observed for patients subsequently treated with interferon, which was greater than during initial treatment. Two patients in the 24-week group experienced reversible reductions in ANC to less than 500 x 106 cells/L, which were not associated with infectious complications. No patients discontinued as a result of hematologic toxicity.

Postmarketing Experience

In addition, the following potential adverse reactions have been reported during post-approval use of INFERGEN. Because the reports of these adverse events are voluntary and the population of uncertain size, it is not possible to reliably estimate the frequency of the reaction or establish a causal relationship to drug exposure.

Application site: injection site reaction, including injection site necrosis ulcer, and bruising; Ear and Labyrinth: hearing loss, hearing impairment; Gastrointestinal: abdominal distention, gastrointestinal bleeding, gastritis; Hepatobiliary: hepatic enzyme elevations, including ALT and AST elevation, abnormal hepatic function, hyperbilirubinemia, jaundice, ascites, hepatic encephalopathy; Infections: sepsis; Metabolism and Nutritional: dehydration; Musculoskeletal: rhabdomyolysis, arthritis, bone pain; Nervous: speech disorder, ataxia, gait abnormal, convulsions, loss of consciousness, memory impairment, tremors, visual field defect; Psychiatric: delusions, hallucinations; Skin and Subcutaneous: bruising, pyoderma gangrenosum, toxic epidermal necrolysis; Vascular Disorders: hemorrhage

Drug Interactions

• No formal drug interaction studies have been conducted with INFERGEN. INFERGEN should be used cautiously in patients who are receiving agents that are known to cause myelosuppression or with agents known to be metabolized via the cytochrome P-450 pathway.9 Patients taking drugs that are metabolized by this pathway should be monitored closely for changes in the therapeutic and/or toxic levels of concomitant drugs.

Use in Specific Populations

Pregnancy

Pregnancy Category (FDA): C

• INFERGEN has been shown to have embryolethal or abortifacient effects in golden Syrian hamsters when given at 135 times the human dose and in cynomolgus and rhesus monkeys when given at 9 to 81 times (based on body surface area) the human dose. There are no adequate and well-controlled studies in pregnant women. INFERGEN should not be used during pregnancy. If a woman becomes pregnant or plans to become pregnant while taking INFERGEN, she should be informed of the potential hazards to the fetus. Males and females treated with INFERGEN should be advised to use effective contraception.

Pregnancy Category (AUS):

• Australian Drug Evaluation Committee (ADEC) Pregnancy Category

There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Interferon alfacon-1 in women who are pregnant.

Labor and Delivery

There is no FDA guidance on use of Interferon alfacon-1 during labor and delivery.

Nursing Mothers

It is not known whether INFERGEN is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised if INFERGEN is administered to a nursing woman. The effect on the nursing neonate of orallyingested INFERGEN in breast milk has not been evaluated.

Pediatric Use

The safety and effectiveness of INFERGEN have not been established in patients below the age of 18 years. INFERGEN therapy is not recommended in pediatric patients.

Geriatic Use

Clinical studies of INFERGEN did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently than younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients. However, treatment with Interferons, including INFERGEN, is associated with psychiatric, cardiac, and systemic (flu-like) adverse effects. Since decreased hepatic, renal or cardiac function, concomitant disease and the use of other drug therapies in elderly patients may produce adverse reactions of greater severity, caution should be exercised in the use of INFERGEN in this population.

Gender

There is no FDA guidance on the use of Interferon alfacon-1 with respect to specific gender populations.

Race

There is no FDA guidance on the use of Interferon alfacon-1 with respect to specific racial populations.

Renal Impairment

There is no FDA guidance on the use of Interferon alfacon-1 in patients with renal impairment.

Hepatic Impairment

There is no FDA guidance on the use of Interferon alfacon-1 in patients with hepatic impairment.

Females of Reproductive Potential and Males

There is no FDA guidance on the use of Interferon alfacon-1 in women of reproductive potentials and males.

Immunocompromised Patients

There is no FDA guidance one the use of Interferon alfacon-1 in patients who are immunocompromised.

Administration and Monitoring

Administration

• subcutaneous

Monitoring

• It is advised that complete blood counts be obtained pretreatment and monitored routinely during therapy
• During treatment, patients’ clinical status and hepatic function should be closely monitored, and INFERGEN treatment should be immediately discontinued if symptoms of hepatic decompensation, such as jaundice, ascites, coagulopathy, or decreased serum albumin, are observed
• Patients with impaired renal function should be closely monitored and INFERGEN should be used with caution in patients with renal insufficiency.

IV Compatibility

There is limited information regarding IV Compatibility of Interferon alfacon-1 in the drug label.

Overdosage

In INFERGEN trials, the maximum overdose reported was a dose of 150 mcg INFERGEN administered SC in a patient enrolled in a phase 1 advanced malignancy trial. The patient received 10 times the prescribed dosage for 3 days. The patient experienced a mild increase in anorexia, chills, fever, and myalgia. Increases in ALT (15 to 127 IU/L), aspartate transaminase (AST) (15 to 164 IU/L), and lactic dehydrogenase (LDH) (183 to 281 IU/L) were reported. These laboratory values returned to normal or to the patient’s baseline values within 30 days.

Pharmacology

There is limited information regarding Interferon alfacon-1 Pharmacology in the drug label.

Mechanism of Action

Structure

File:Interferon alfacon-101.png

This image is provided by the National Library of Medicine.

Pharmacodynamics

There is limited information regarding Pharmacodynamics of Interferon alfacon-1 in the drug label.

Pharmacokinetics

There is limited information regarding Pharmacokinetics of Interferon alfacon-1 in the drug label.

Nonclinical Toxicology

Carcinogenesis, Mutagenesis, Impairment of Fertility Carcinogenesis: No carcinogenicity data for INFERGEN are available in animals or humans.

Mutagenesis: INFERGEN was not mutagenic when tested in several in vitro assays, including the Ames bacterial mutagenicity assay and an in vitro cytogenetic assay in human lymphocytes, either in the presence or absence of metabolic activation.

Impairment of Fertility: INFERGEN at doses as high as 100 mcg/kg did not selectively affect reproductive performance or the development of the offspring when administered SC to male and female golden Syrian hamsters for 70 and 14 days before mating, respectively, and then through mating and to day 7 of pregnancy.

Clinical Studies

There is limited information regarding Clinical Studies of Interferon alfacon-1 in the drug label.

How Supplied

Storage

There is limited information regarding Interferon alfacon-1 Storage in the drug label.

Images

Drug Images

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Patient Counseling Information

If home use is determined to be desirable by the physician, instructions on appropriate use should be given by a healthcare professional. The patient must be instructed as to the proper dosage and administration. Information included in the MEDICATION GUIDE should be fully reviewed with the patient; it is not a disclosure of all, or possible, adverse effects. The most common adverse reactions occurring with INFERGEN therapy are flu-like symptoms including fatigue, fever, rigors, headache, arthralgia, myalgia, and increased sweating. Non-narcotic analgesics and bedtime administration of INFERGEN may be used to prevent or lessen some of these symptoms.

Additionally, patients must be thoroughly instructed in the importance of proper disposal procedures and cautioned against the reuse of needles, syringes, or re-entry of the drug product. A puncture-resistant container for the disposal of used syringes and needles should be used by the patient and should be disposed of according to the directions provided by the health care provider

Precautions with Alcohol

• Alcohol-Interferon alfacon-1 interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.

Brand Names

• ®

Look-Alike Drug Names

• A® — B®

Drug Shortage Status

Price

References

The contents of this FDA label are provided by the National Library of Medicine.

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