LAUSR

&NA; Danqi Tongmai tablet (DQTT), an innovative TCM formula under clinical trials, is composed of salvianolic acids (SA) and panax notoginsenosides (PNE) for the treatment of coronary heart disease and angina pectoris. However, the in vivo herb‐herb interaction of DQTT remains unclear. In the present research, a rapid, reliable and sensitive method for quantitative analysis of multi‐notoginsenoside in rat plasma based on ultra high performance liquid chromatography coupled with triple quadrupole mass spectrometry (UHPLC‐TQ/MS) was established and then applied to explore the herb‐herb interaction mechanism of DQTT based on the pharmacokinetics in acute myocardial ischemia (AMI) and sham rats after oral administration of DQTT and PNE. Compared with sham rats after oral administration of PNE, the values of AUC0‐t for Rf and Rb2 were significantly higher in DQTT group. Compared with AMI rats after oral PNE, AUC0‐t for NR1, Rg1, Re, Rb1, Rd, Rg2, Rb2, NR2, Rh1, F1 and F2 were significantly increased after oral administration of DQTT. These results hinted that SA could improve the bioavailability of notoginsenosides in AMI rats, which provides scientific information for better understanding the herb‐herb interaction mechanism and offers a reference for clinical administration of DQTT. Additionally, the presently developed methodology was simple, robust, accurate, precise, and would be useful for the pharmacokinetic studies for all kinds of notoginsenosides and other herbal saponins.