羟嗪（qiǎngqín，英语：Hydroxyzine，也叫做安泰乐）是属于二苯甲烷和哌嗪类的第一代抗组胺药。由于其可以与某些大脑中的受体结合，它被用作强力的抗焦虑药与轻度的抗强迫症药，用来治疗精神上的焦虑与紧张。由于其有抗组胺的效果，也可治疗严重的瘙痒，痛觉过敏和晕车引起的恶心，甚至作为缓解阿片戒断反应的药物。

Hydroxyzine (/haɪˈdrɒksᵻziːn/) is a first-generation antihistamine of the diphenylmethane and piperazine class. It was first synthesized by Union Chimique Belge in 1956 and was marketed by Pfizer in the United States later the same year, and is still in widespread use today.