五苓散为汉代张仲景所创立,见于《伤寒论》及《金匮要略》。它是由猪苓、泽泻、白术、茯苓四种利水剂和桂枝所组成。主要是用来治疗口渴、小便不利、饮水亦不能止渴、头痛、腹泻、呕吐的五苓散证及诸湿水肿,如肾炎水肿、心脏病水肿、肝硬化腹水、阴囊水肿以及胃内有停水而见小便不利、尿潴留等。日本临床医家注意到西药利尿剂使用范围比较局限,而中药利水剂可用于多种疾病,认为可能含有除利尿作用以外的成分,或者含有与西药利尿剂作用机理不同的利尿剂,因此,在 Wu Yan San was founded by Zhang Zhongjing in the Han Dynasty. It was found in Treatise on Febrile Diseases and the Outline of the Golden Chamber. It is composed of Polyporus umbellatus, Alisma, Atractylodes macrocephala, Astragalus membranaceus and Guizhi. It is mainly used to treat thirst, urination, water can not quench thirst, headache, diarrhea, vomiting and other five phlegm syndrome and wet edema, such as nephritis edema, heart disease edema, cirrhosis of ascites, scrotal edema, and stomach Stop drinking and see urination, urinary retention and so on. Japanese clinicians have noticed that the scope of western medicine diuretics is more limited, and traditional Chinese medicine water-repellent agents can be used for many diseases, and it is thought that they may contain ingredients other than diuretic effect, or diuretics that contain different mechanisms of action from western diuretics.