An agent for treating diseases in circulatory organs which comprises a piperazine compound of the formula ##STR1## wherein R.sub.1, R.sub.2 and A are as defined hereunder, or a salt thereof and a pharmaceutically acceptable carrier.
一种用于治疗循环系统器官疾病的药剂,包括式中的
哌嗪化合物##STR1##,其中R.sub.1、R.sub.2和A如下所定义,或其盐和药用载体。