OBJECTIVETo investigate the main constituents absorbed in the blood after orally administrating Shuanghuanglian injection extracts of its composed crude drug and provide the foundation for optimizing the prescription of Shuanghuanglian powder for injection.

METHODThrough analysing HPLC fingerprint established based on shuanghuanglian powder for injection and extracts of it composed crude drug, the active investigation were carried out among the peaks of control plasma and plasma containing drug in rats, shuanghuanglian powder for injection and extract of its composed crude drug. And the analysis was performed about relative content of constituents in each sample. Furthermore their original drugs and the metabolites in plasma containing drug were ascertained.

RESULTEight compounds were detected in plasma after oral administration of Shuanghuanglian, four of them were the original compounds contained in Shuanghuanglian powder for injection and three of them were relative metabolites. It has also found that contents of original compounds such as baicalin and chlorogenic acid fell off gradually, but their metabolites increased in rat plasma in vivo. With increasing time the main components of forsythia have not been detected obviously in rats plasma.

CONCLUSIONIn some extent, the compounds absorbed into blood from Shuanghuanglian powder for injection and their metabolites are the effective constituents, and its plasma pharmacochemistry should be subject to illuminate the pharmacological effects and the active mechanism.