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peginterferon alfa-2b

Drug #2244

Peginterferon alfa-2b is a covalent conjugate of recombinant alfa interferon with monomethoxy polyethylene glycol (PEG). The molecular weight of the PEG portion of the molecule is 12,000 Daltons. Interferon alfa-2b is a water-soluble protein with a molecular weight of 19,271 Daltons produced by recombinant DNA techniques. It is obtained from the bacterial fermentation of a strain of Escherichia coli bearing a genetically engineered plasmid containing an interferon gene from human leukocytes. The biological activity of PEG-Intron is derived from its interferon alfa-2b moiety. Interferons exert their cellular activities by binding to specific membrane receptors on the cell surface and initiate a complex sequence of intracellular events. These include the induction of certain enzymes, suppression of cell proliferation, immunomodulating activities such as enhancement of the phagocytic activity of macrophages and augmentation of the specific cytotoxicity of lymphocytes for target cells, and inhibition of virus replication in virus-infected cells.

Primary Characteristics

It belongs to Antiviral Agents pharmacological group on the basis of mechanism of action.

Molecular Weight: 31 · Non-proprietary name: peginterferon alfa-2b.

Molecular structure of peginterferon alfa-2b

Pharmacokinetics

Elimination: plasma half-life is 4.6 hours, renal excretion is 30%.

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Indications

peginterferon alfa-2b is primarily indicated in conditions like Chronic hepatitis C.

Contraindications

peginterferon alfa-2b is contraindicated in conditions like Autoimmune hepatitis, Hypersensitivity to the drug.

Dosage

peginterferon alfa-2b's dosage details are as follows:

DoseSingle DoseFrequencyRouteInstructions
Adult Dosage
1 mcg/kg/week1 mcg/kg/weekScDose reduction or discontinuation is required in case of depression, haemtological and renal side effects. For patients with a history of stable cardiac disease receiving Pegnterferon alfa 2b in combination with ribavirin, dose should be reduced by half and the ribavirin dose by 200mg/day if a 2g/dL decrease in hemoglobin is observed during any 4 week period. Both Peginterferon alpha 2b and ribavirin should be permanently discontinued if patients have hemoglobin levels <12 g/dL after this ribavirin dose reduction.
1 mcg/kg/week1 mcg/kg/weekScwhen it is used in combination with ribavirin.
Paediatric Dosage (20kg)
60 mcg/m2/week60 mcg/m2/weekScThis is the dose when given in combination with ribavirin
Neonatal Dosage (3kg)
No data.

Drug Interactions

None recorded.

Side Effects

peginterferon alfa-2b produces potentially life-threatening effects which include Infection. Careful monitoring is needed with proper medical management.

peginterferon alfa-2b is known to cause more or less tolerable side effects which are usually transient. These include Anxiety, Asthenia , Fatigue, Fever, Headache, Injection site reactions, Myalgia, Nausea, Neutropenia, Rigors , Vomiting .

Warnings / Precautions

Safety and efficacy in pediatrics less than 3 years old have not been established. Neuropsychiatric, cardiac, pulmonary, GI, and systemic (flu-like) adverse reactions may be more severe in geriatric patients. Safety and efficacy have not been estacblished in HIV or HBV co-infected and organ transplant patients. It is contraindicated in patients with creatinine clearance less than 50 mL/min. It is also contraindicated in pregnant women and patients with Hemoglobinopathies when taken in combination with ribavirin. Birth defects and fetal death with ribavirin: Patients must have a negative pregnancy test prior to therapy, use at least 2 forms of contraception, and undergo monthly pregnancy tests. Patients exhibiting the following conditions should be closely monitored and may require dose reduction or discontinuation of therapy: Hemolytic anemia with ribavirin. Neuropsychiatric events. History of significant or unstable cardiac isease. Hypothyroidism, hyperthyroidism, hyperglycemia, diabetes mellitus that cannot be effectively treated by medication. New or worsening ophthalmologic disorders. Ischemic and hemorrhagic cerebrovascular events. Severe decreases in neutrophil or platelet counts. History of autoimmune disorders. Pancreatitis and ulcerative or hemorrhagic/ischemic colitis and pancreatitis. Pulmonary infiltrates or pulmonary function impairment. Child-Pugh score greater than 6 (class B and C). Increased creatinine levels in patients with renal insufficiency. Serious, acute hypersensitivity reactions and cutaneous eruptions. Dental/periodontal disorders reported with combination therapy. Hypertriglyceridemia may result in pancreatitis (e.g., triglycerides greater than 1000 mg/dL). Weight loss and growth inhibition reported with combination therapy in pediatric patients. Peripheral neuropathy when used in combination with telbivudine.

Available Brands

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Storage Conditions

peginterferon alfa-2b should be stored Injection.

Drug Classification

  1. 1.6.5.3
  2. 2.6.5.3
  3. 3.8.1Immunomodulators

Manufacturers

Manufacturers of peginterferon alfa-2b in Pakistan: