To investigate the effect of Tongxinluo capsule (TXLC) on the patients with unstable angina pectoris (UAP). Patients of UAP were divided into two groups

the treated group (n = 60) was treated with TXLC and the Danshen group (n = 30) was treated with composite Danshen tablet. The plasma endothelin (ET) and calcitonin gene related peptide (CGRP) were measured before and after treatment. Data were compared between the two groups and also compared with those measured in 20 healthy subjects for control. ET level was higher and CGRP level lower significantly in UAP patients than that in healthy subjects significantly (P<0.05). After TXLC treatment

ET significantly lowered (P<0.01) and CGRP increased (P<0.05 ) . But in the Danshen group after treatment

the former decreased (P<0.05)

while the latter remained unchanged (P>0.05). The effect of TXLC was better than that of composite Danshen tablet. TXLC is an effective drug for UAP treatment

which could efficiently regulate the ET and CGRP metabolism and ameliorate the degree of myocardial ischemia damage.