The present invention relates to a compound of the formula ##STR1## and the pharmaceutically acceptable salts thereof wherein W is a tricyclic heterocyclic ring system; which is an .alpha.-1 adrenergic antagonist and is useful in the treatment of BPH; also disclosed are .alpha.-1 antagonist compositions and a method for antagonizing .alpha.-1 receptors and treating BPH.
本发明涉及一种具有以下结构的化合物##STR1##及其药用可接受的盐,其中W是一个
三环杂环环系统;它是一种α-1
肾上腺素受体拮抗剂,对治疗BPH有用;还公开了α-1拮抗剂组合物和拮抗α-1受体并治疗BPH的方法。