大麻是桑科大麻属植物 Cannabis sativa L。其种子火麻仁和雌花序做为药用已有悠久的历史。大麻叶做为药用《本草纲目》已有记载。在《新药本草》中记载服大麻叶有泻下作用。但用于治疗肠梗阻从未见报导。一九七三年宁城县兽医院首先发现大麻叶有治疗马匹“结症”的作用。这一发现引起了有关方面的重视,一九七四年由宁城县兽医院、省畜牧兽医科学研究所、沈阳药学院等十一 Marijuana is a Sankoh Cannabis sativa L. Its seeds, hemp kernels and female inflorescences, have a long history as medicinal herbs. Cannabis leaf has been recorded as a medicinal “Compendium of Materia Medica”. In the “New Drug Materia Medica” recorded serving cannabis diarrhea effect. However, it has never been reported to treat intestinal obstruction. In 1973, the Veterinary Hospital of Ningcheng County first discovered that hemp leaves had the effect of treating horses with “nose disease.” This discovery attracted the attention of relevant parties. In 1974, Ningcheng County Veterinary Hospital, Provincial Institute of Animal Husbandry and Veterinary Medicine, Shenyang Pharmaceutical College, etc.