The single dose pharmacokinetics of recombinant human erythropoietin (r-HuEPO) were compared in six continuous ambulatory peritoneal dialysis (CAPD) patients after intravenous (i.v.), subcutaneous (s.c.), and intraperitoneal (i.p.) administration of 300 U/kg. Intravenous administration gave results close to those obtained in hemodialysis patients, with a half-life of 11.2 h and a volume of distribution of 5.0% of body weight. After subcutaneous administration, the serum concentration rose slowly to plateau between 24 and 36 h, the area under the serum concentration vs. time curve from 6 to 72 h being 18.2% of that after intravenous administration. After intraperitoneal administration, the serum concentration was even lower, the area under the curve from 0 to 24 h was between 2.5 and 3.6% of that after intravenous administration, and 80% of the administered dose was recovered in the first peritoneal effluent after a 4-h dwell time.

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