1-(3-Substituted-2-pyridinyl)piperazines and their acid addition salts are selective .alpha..sub.2 -adrenergic receptor antagonists and thereby useful as antidepressant agents and for treating sedation caused by antihypertensive therapy.
                            1-(3-取代的2-
吡啶基)
哌嗪及其酸盐加合物是选择性的α2-
肾上腺素能受体拮抗剂,因此可用作抗抑郁剂和用于治疗抗高血压治疗引起的镇静。