紫薇(Lagerstroemia indica L.)又名怕痒树、五爪金龙、紫金标等,是千屈菜科(Lythraceae)、紫薇属的植物。据记载,紫薇的根、叶、花均入药。根内服治疗牙痛、急性肝炎、白痢,并能解黄藤中毒,外敷治痈疽肿毒;叶煎汁内服治疗白痢、胃出血等出血性疾病,外敷治疗创伤出血、湿疹;花煎服治风丹、产后血崩不止、崩中带下,外洗治疥癞癣疮,据化学分析叶中含有紫薇缩醛、戊醇、鞣花酸,茎、叶、花、果实、种子含有德雪宁等六种生物碱。据药理实验:50%叶煎剂对金黄色葡萄球菌、福氏痢疾杆菌、伤寒杆菌、绿脓杆菌有抑制作用,还有抗流感病毒作用。德雪宁碱有抗真 Lagerstroemia indica (Lgerstroemia indica L.), also known as itch tree, Wujiao Jinlong, Zijin standard, etc., is a plant of Lythraceae and Lagerstroemia. According to records, the roots, leaves and flowers of crape myrtle are used as medicine. Oral treatment of toothache, acute hepatitis, white diarrhea, and can solve the yellow rattan poisoning, topical cure carbuncle swollen poison; leaf dripping water for internal treatment of white peony, stomach bleeding and other bleeding diseases, topical treatment of traumatic bleeding, eczema; flower decoction Zhifeng Dan , Postpartum hemorrhage, bleeding in the middle of the collapse, washing and treatment of hemorrhoids outside, according to chemical analysis leaves contain lager acetal, amyl alcohol, ellagic acid, stems, leaves, flowers, fruits, seeds contain De Schevening, etc. Alkaloids. According to pharmacological experiments: 50% leaf decoction has inhibitory effects on Staphylococcus aureus, Shigella flexneri, Salmonella typhi, and Pseudomonas aeruginosa, as well as anti-influenza virus effects. Dechenrine has anti-truth