The present invention relates to a compound of the formula ##STR1## and the pharmaceutically acceptable salts thereof wherein W is a bicyclic heterocyclic ring system. The compounds are .alpha.-1 adrenergic antagonists and are useful in the treatment of BPH; also disclosed are .alpha.-1 antagonist compositions and a method for antagonizing .alpha.-1 receptors and treating BPH.
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.