Injection Manufacturer Distributor: Beacon Pharmaceuticals Ltd.
Generic Name:Peginterferon alfa-2a [Pegylated Interferon alfa-2a] 180 mcg/0.5 ml
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Chronic Hepatitis C: Peginterferon alfa-2a alone or in combination with Ribavirin, is indicated for the treatment of adults with chronic hepatitis C (CHC) virus infection who have compensated liver disease and have not been previously treated with interferon alpha.
Chronic Hepatitis B: Peginterferon alfa-2a is indicated for the treatment of adult patients with HBeAg positive and HBeAg negative chronic hepatitis B who have compensated liver disease and evidence of viral replication and liver inflammation.
Hepatic viral infections (Hepatitis B), Hepatic viral infections (Hepatitis C)
Peginterferon alfa-2a are interferon proteins bound to polyethylene glycol (PEG) molecules resulting in higher and more prolonged serum interferon concentrations. It has antiviral, antiproliferative and immune-regulating activity. Interferons are activated when it interacts with cells through high affinity cell surface receptors. The effects of this activation include the induction of gene transcription, inhibition of cellular growth, alteration of cellular differentiation, interference with oncogene expression, alteration of cell surface antigen expression, increase in phagocytic activity of macrophages and augmentation of cytotoxicity of lymphocytes for target cells.
Chronic hepatitis C: The recommended dose of Peg interferon is 180 mcg once weekly for 48 weeks by subcutaneous administration on abdomen or thigh
Chronic hepatitis B: The recommended dose of Peg interferon is 180 mcg once weekly for 48 weeks by subcutaneous administration on abdomen or thigh
Hepatitis C Genotype 1 & 4:
Hepatitis C Genotype 2 & 3:
Pregnancy Category C: Peginterferon alfa-2a monotherapy. There are no adequate and well controlled trial on pregnant women & developing fetus due to teratogenic effects. Peginterferon alfa-2a is recommended for use in women of childbearing potential only when they are using effective contraception during therapy.
Pregnancy Category X. It is not known whether peginterferon or ribavirin or its components are excreted in human milk. Because of the potential for adverse reactions from the drugs in nursing infants, a decision must be made whether to discontinue nursing or discontinue peginterferon and ribavirin treatment.
Hepatic Impairment:
Chronic hepatitis C: Alanine transaminase (ALT) progressively rising above baseline: Decrease dose to 135 mcg/wk. If ALT continues to rise or is accompanied by increased bilirubin or hepatic decompensation, discontinue immediately.
Chronic hepatitis B: Alanine transaminase (ALT) >5 times the upper limits of normal: Monitor LFTs more frequently; consider 135 mcg/wk or temporarily discontinuing (may resume after ALT flare subsides). ALT >10 times the upper limits of normal: Consider discontinuing.
Dose modifications:
For moderate-to-severe adverse reactions: Initially, 135 mcg/wk or in some cases, 90 mcg/wk. Haematologic parameters: ANC <750/mm3: 135 mcg/wk; ANC <500/mm3: Discontinue therapy until >1000/mm3, then restart at 90 mcg/wk; monitor ANC. Platelet count: <50,000/mm3: 90 mcg/wk; <25,000/mm3: Discontinue therapy. Depression: Moderate: Decrease to 90-135 mcg once/wk; evaluate once wkly, if symptoms improve and remain stable for 4 wk, continue reduced dosing or return to normal dose; Severe: Discontinue treatment permanently. Administer in the abdomen or thigh.
Renal Impairment:
CrCl <50: Use caution; monitor for toxicity .
There are limited experiences of overdose. There were no serious reactions attributed to overdose. There is no specific antidote. Dialysis is not effective.
Store in refrigerator at 2-8° C; do not freeze or shake. Protect from light.
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