Five mg of peplomycin was administered continuously for 24 hours by intravenous or subcutaneous infusion. Subcutaneous administration of peplomycin was performed done with the use of an SP-5 microinfusion pump made by the in Nipro Company. The plasma concentration after intravenous infusion was 0.0106 +/- 0.039 microgram/ml, while that after subcutaneous infusion was 0.131 +/- 0.037 microgram/ml. There was no statistical significance between the differences observed for intravenous and subcutaneous infusion.