peginterferon alfa-2b
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.

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:
| Dose | Single Dose | Frequency | Route | Instructions |
|---|---|---|---|---|
| Adult Dosage | ||||
| 1 mcg/kg/week | 1 mcg/kg/week | — | Sc | Dose 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/week | 1 mcg/kg/week | — | Sc | when it is used in combination with ribavirin. |
| Paediatric Dosage (20kg) | ||||
| 60 mcg/m2/week | 60 mcg/m2/week | — | Sc | This 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
Available Brands
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Single Ingredient
Storage Conditions
Drug Classification
- 1.6.5.3
- 2.6.5.3
- 3.8.1 — Immunomodulators
Manufacturers
Manufacturers of peginterferon alfa-2b in Pakistan: