An HPLC-UV method was established for determination of oseltamivir carboxylate, an active metabolite of oseltamivir, in biological materials. Oseltamivir carboxylate and floropipamide (internal standard) were extracted by using a mixed mode cation exchange extraction cartridge. The recovery yields of oseltamivir carboxylate from spiked blood at concentrations 0.1μg/ml and 1.0μg/ml were 103.8±16.9% and 95.0±4.3%, respectively. Linearity was obtained in the concentration from 0.1 to 3.0μg/ml. The detection limit was 0.04μg/ml (S/N=3). This method was applied to a case of death from falling after ingestion of a Tamiflu ® capsule containing 75mg of oseltamivir. Concentration of oseltamivir carboxylate in the femoral blood was 0.4μg/ml. The highest concentration in all specimens was in the liver at 18.3μg/g. In all brain samples, the concentrations were not higher than the quantification limit (0.1μg/g).