A HPLC method for quantitative determination of levopraziquantel in serum was described. A RP ODS-C18 (5μm) column fitted with a UV detector at 220 nm was used for analysis. The mobile phase used was methanol-water (7:3v/v). The analogue of praziquantel was used as an internal standard. The minimum detectable limit was 2.5ng. Assay linearity was demonstrated over the range of 0.012-1.6μg/ml of serum (r=0.999). The recovery ofthe method was 93.4-97.2%. This method was simple, precise, and sensitive, and had ...