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The pharmacokinetics of recombinant leukocyte A interferon (rIFN-alpha A) were studied following intravenous (i.v.) bolus, 60 min (i.v. inf.) infusion, intramuscular (i.m.), subcutaneous (s.c.), and oral (p.o.) administrations to 15 male beagle dogs. Each animal received at least one 3 X 10(6) units/kg dose of rIFN-alpha A by one of the five routes and/or modes of administration. Blood samples were collected and the serum was separated and analyzed for rIFN-alpha A concentrations by an enzyme immunoassay, ELISA. There were no measurable rIFN-alpha A concentrations (less than 0.020 ng/ml) following oral administration. In general serum rIFN-alpha A concentrations exceeded 100 ng/ml following i.v. bolus and infusion doses then declined rapidly in a biphasic manner. The volume of distribution at steady state Vdss ranged from 0.14 to 0.21 liters/kg after i.v. infusion. Total body serum clearance (ClB) ranged from 14.6 to 23.9 ml/min, which is about 50% the estimated inulin clearance in dogs. The harmonic mean elimination half-lives ranged from 4.5 to 9.5 h. A prolonged absorption profile was seen following i.m. and s.c. administrations and the systemic bioavailability for both routes was 42% when compared with the i.v. infusion. These appear to be the first pharmacokinetic profiles of rIFN-alpha A reported in the dog.

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