Objective:To compare pharmacokinetics between monocase paeoniflorin and that in Si Ni San and discuss the change on pharmacokinetic parameters affects by other components.Methods:Paeoniflorin in plasma was determined by RP-HPLC with UV detector.The concentration-time data were fitted using 3P97 pharmacokinetics program.Results:Bioavailablity of Paeoniflorin in Si Ni San was significantly decreased compared with its monomer
which indicates Paeoniflorin takes pharmacological action besides itself
possibly in metabolites by intestinal bacteria and liver
promoted by the other components in Si Ni San.The result may has a certain significance on pharmacokinetics affected by other components in a TCM compound prescription.