Objective: To determinate the catalpol contents in dried rehmannia root and Taohong Siwu Decoction containing rehmannia root with high performance liquid chromatography (HPLC).

• 目的：利用高效液相色谱(high performance liquid chromatography, HPLC)法测定生地黄和桃红四物汤中梓醇的含量。