Interferon alfacon-1 clinical pharmacology
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Sheng Shi, M.D. [2]
Clinical Pharmacology
Pharmacodynamics
Interferons induce pleiotropic biologic responses which include antiviral, antiproliferative, and immunomodulatory effects, regulation of cell surface major histocompatibility antigen (HLA class I and class II) expression and regulation of cytokine expression.
Analysis of INFERGEN-induced cellular products (induction of 2'5' OAS and ß-2 microglobulin) after treatment in these subjects revealed a statistically significant, dose-related increase in the area under the curve (AUC) for the levels of 2'5' OAS or ß-2 microglobulin induced over time. Concentrations of 2'5' OAS were maximal at 24 hours after dosing, while serum levels of ß-2 microglobulin appeared to reach a maximum 24 to 36 hours after dosing. The dose-response relationships observed for 2'5' OAS and ß-2 microglobulin were indicative of biological activity after subcutaneous injection administration of 1 mcg to 9 mcg INFERGEN.
Pharmacokinetics
The pharmacokinetic properties of INFERGEN have not been evaluated in patients with chronic hepatitis C. Pharmacokinetic profiles were evaluated in normal, healthy volunteer subjects after subcutaneous injection of 1 mcg, 3 mcg, or 9 mcg INFERGEN. Plasma levels of INFERGEN after subcutaneous injection administration of any dose were too low to be detected by either enzyme-linked immunosorbent assay (ELISA) or by inhibition of viral cytopathic effect.
Renal Dysfunction
Patients with creatinine clearance <50 mL/min should not be treated with ribavirin [see WARNINGS AND PRECAUTIONS: Renal Impairment (5.6); Ribavirin Labeling].Pharmacodynamics Interferons induce pleiotropic biologic responses which include antiviral, antiproliferative, and immunomodulatory effects, regulation of cell surface major histocompatibility antigen (HLA class I and class II) expression and regulation of cytokine expression.
Analysis of INFERGEN-induced cellular products (induction of 2'5' OAS and ß-2 microglobulin) after treatment in these subjects revealed a statistically significant, dose-related increase in the area under the curve (AUC) for the levels of 2'5' OAS or ß-2 microglobulin induced over time. Concentrations of 2'5' OAS were maximal at 24 hours after dosing, while serum levels of ß-2 microglobulin appeared to reach a maximum 24 to 36 hours after dosing. The dose-response relationships observed for 2'5' OAS and ß-2 microglobulin were indicative of biological activity after subcutaneous injection administration of 1 mcg to 9 mcg INFERGEN.
12.3 Pharmacokinetics
The pharmacokinetic properties of INFERGEN have not been evaluated in patients with chronic hepatitis C. Pharmacokinetic profiles were evaluated in normal, healthy volunteer subjects after subcutaneous injection of 1 mcg, 3 mcg, or 9 mcg INFERGEN. Plasma levels of INFERGEN after subcutaneous injection administration of any dose were too low to be detected by either enzyme-linked immunosorbent assay (ELISA) or by inhibition of viral cytopathic effect.
Renal Dysfunction
Patients with creatinine clearance <50 mL/min should not be treated with ribavirin [see WARNINGS AND PRECAUTIONS: Renal Impairment (5.6); Ribavirin Labeling].
References
Adapted from the FDA Package Insert.