OBJECTIVE Danshen injection and Honghua injection,traditional Chinese medicine(TCM)injections,made from the extracts of Salvia miltiorrhiza Bge.and Carthamus tinctorius L.,have a potential to be developed into the useful drugs for the.As the common TCM injections,Danshen injection is often combined with Honghua injection to treat cardiovascular disease.The purpose of this study was to investigate the pharmacokinetic parameters of Honghua injection combined with Danshen injection when they were coadministered intravenously in human and rats through the tail vein.METHODS Single and multiple doses of Danshen injection to study Danshen injection on Honghua injection pharmacokinetics parameters and single and multiple doses of Honghua injection to study Honghua injection on Danshen injection pharmacokinetics parameters.The plasma concentrations of hydroxysafflor A(HSYA)and tanshinol and salvianolic acid B were determined by the reliable high-performance liquid chromatography(HPLC)method.The concentrations of HSYA in urine of rats and human were also determined by HPLC method.DAS 2.1.1software was adopted for calculating the pharmacokinetic parameters.RESULTS The simultaneous intravenous Honghua injection and salvia miltiorrhiza injiection significantly altered the pharmacokinetic parameters of both injections when compared with the individual intravenous administration of each injection.The area under the concentration-timecurve(AUC)and maximum plasma concentration(Cmax)of HSYA and tanshinol and salvianolic acid B were significantly increased.The cumulative urine excretion of HSYA in human and rats during 24 h was decreased after two drugs were administered simultaneously by the intravenous.CONCLUSION Honghua injection and Danshen injection interact with each other following simultaneous intravenous and they have a synergistic action.This experiment has identified the pharmacokinetic parameters and provided a rationale for the clinical use of the drug combination. OBJECTIVE Danshen injection and Honghua injection, traditional Chinese medicine (TCM) injections, made from the extracts of Salvia miltiorrhiza Bge. And Carthamus tinctorius L., have a potential to be developed into the useful drugs for the. As the common TCM injections, Danshen injection is often combined with Honghua injection to treat cardiovascular disease. The purpose of this study was to investigate the pharmacokinetic parameters of Honghua injection combined with Danshen injection when they were coadministered intravenously in human and rats through the tail vein. METHODS Single and multiple doses of Danshen injection to study Danshen injection on Honghua injection pharmacokinetics parameters and single and multiple doses of Honghua injection to study Honghua injection on Danshen injection pharmacokinetics parameters. The plasma concentrations of hydroxysafflor A (HSYA) and tanshinol and salvianolic acid B were determined by the reliable high -performance liquid chromatography (HPLC) method.The concentrations of HSYA in urine of rats and human were also determined by HPLC method. DAS 2.1.1software was adopted for calculating the pharmacokinetic parameters .RESULTS The simultaneous intravenous Honghua injection and salvia miltiorrhiza injiection significant altered the pharmacokinetic parameters of both injections when compared with the individual intravenous administration of each injection. The area under the concentration-timecurve (AUC) and maximum plasma concentration (Cmax) of HSYA and tanshinol and salvianolic acid B were heavy increased. The cumulative urine excretion of HSYA in human and rats during 24 h was decreased after two drugs were administered simultaneously by the intravenous. CONCLUSION Honghua injection and Danshen injection interact with each other following synchronized intravenous and they have a synergistic action. This experiment has identified the pharmacokinetic parameters and provided a rationale for the clinical use of the drug combination .