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Dahurica dahurica belongs to the genus Angelica of the family Umbelliferae, for the root of the umbelliferae plant Xing'an Angelica dahurica, Sichuan Angelica dahurica, Hang Angelica dahurica, or Yunnan cattle windbreak. It has the efficacy of dispelling wind and dispersing cold, clearing the orifices and relieving pain, subduing swelling and draining pus, and drying dampness and stopping leucorrhea. [Chemical composition] This product contains volatile oil, coumarin and its derivatives, such as angelicin, white angelica ether, Europe before the carrot ethanol, Angelica dahurica toxin and so on. It also contains volatile oil, the oil has 3-methylene-6-cyclohexene, undecylenic charcoal-4, elemene, cetanoic acid, nonenol and so on. [Clinical application] 1. Used for cold and wind-cold, headache, nasal congestion. It is often combined with Fangfeng and Qiangwu. 2. For headache, toothache, nasal abyss, rheumatic paralysis. For treating headache of Yangming, brow and bone pain, head wind pain, etc., it is used with Thornywort, Fenghuang and Chuanxiong for external wind-cold; and Mentha piperita, Chrysanthemum and Brambleberry for external wind-heat. For toothache due to wind-fire, combining with Gypsum and Rhizoma Coptidis. For nasal abyss headache, combining with Cang Er Zi, Xin Yi and Mint. For wind-dampness-cold paralysis and back pain, with Qiangwu, Duhong, Wei Ling Xian. 3. For sores and ulcers, swelling and pain. For example, it can be used with dandelion and piper betel at the beginning of breast carbuncle; it can be used with honeysuckle and asphalt powder when the pus does not come out freely. 4. used for excessive discharge from the uterus. It is cold and wet with the bandage, with antler cream, atractylodes, gunner, etc.; is damp and hot with the bandage, with psyllium, cypress, etc.