异丙酚（英语：Propofol），又名「丙泊酚」，商品名Diprivan。因其静脉制剂的外观如牛奶一样，常被俗称为“失忆牛奶”、「牛奶针」。是一种短效静脉麻醉药，麻醉作用与硫喷妥钠相似，但作用要强约1.8倍。作用迅速，维持时间短。诱导效果好，作用平稳，无兴奋现象，又可通过静脉滴注或多次使用来控制麻醉深度，无显着蓄积，病人苏醒后头脑清楚，能迅速恢复。用于诱导麻醉和维持麻醉。如果其他药物都没有奏效，它也可用于持续性癫痫状态。它是静脉给药，最大药效需要大约两分钟后发生，并且通常持续五至十分钟。异丙酚也常用于兽药。它被50多个国家批准可用。

Propofol, marketed as Diprivan among others, is a short-acting medication that results in a decreased level of consciousness and lack of memory for events. Its uses include the starting and maintenance of general anesthesia, sedation for mechanically ventilated adults, and procedural sedation. It is also used for status epilepticus if other medications have not worked. It is given intravenously. Maximum effect takes about two minutes to occur and it typically lasts five to ten minutes.