氯丙嗪（Chlorpromazine、CPZ，美国：Thorazine，其它地区：Largactil），也叫冬眠灵，是第一个抗精神病药，开创了药物治疗精神疾病的历史。从1950年代初氯丙嗪用于治疗精神分裂症和躁狂症开始，进入了精神药理学发展的黄金阶段。氯丙嗪的发现改变了精神分裂症患者的预后，并在西方国家掀起了非住院化运动，使许多精神病患者不必被终身强迫关锁在医院里。氯丙嗪的发现具有里程碑式的意义。

Chlorpromazine (CPZ), marketed under the trade names Thorazine and Largactil among others, is an antipsychotic medication. It is primarily used to treat psychotic disorders such as schizophrenia. Other uses include the treatment of bipolar disorder, attention deficit hyperactivity disorder, nausea and vomiting, anxiety before surgery, and hiccups that do not improve following other measures. It can be given by mouth, by injection into a muscle, or into a vein.