Transfer of cefmenoxime (CMX) into the burn blister fluids was studied in 10 burned patients with 2 administrated doses (25, 50 mg/kg). CMX concentrations in serum and burn blister fluid after 1 hour intravenous drip infusion were measured using Proteus mirabilis ATCC 21100 as the test organism grown in the DST agar medium. In the case of CMX 25 mg/kg dose, the peak serum concentration was observed 61.5 micrograms/ml at 1 hour, while the peak burn blister fluid concentration was observed 15.2 micrograms/ml at 2 hours. Pharmacokinetic parameters of serum concentration calculated were 1.02 hours as half-life (beta) and 0.42 L/kg as distribution volume, respectively. In the case of CMX 50 mg/kg dose, the peak serum concentration was observed 122.0 micrograms/ml at 1 hour and the peak burn blister fluid concentration was observed 40.8 micrograms/ml at 2 hours. Pharmacokinetic parameters of serum concentration calculated were 1.27 hours as half-life (beta) and 0.55 L/kg as distribution volume. From this study, the dose dependency between 25 mg/kg dose and 50 mg/kg dose in serum and in burn blister fluid is recognized.