xiao qing long tang (source: Shang Han Lun)
Translated and explained by: Joe Hing kwok Chu
Usage: cold or influenza, cough, bronchitis, asthma, edema, whooping cough, excessive phlegm and saliva, tears.
Prescription:
xi xin 1 qian, gan jiang 1.5 qian, wu wei zi 1 qian, ban xia 3 qian, ma huang 1.5 qian, bai shao 3 qian, gan cao 1.5 qian.
Adjustment:
If the throat is inflamed and painful, add jie geng. If asthma is serious add larger dosage of xing ren, su zi. If phlegm or mucus is heavy add yuan zhi, fu ling. Chest is heavy due to cough and asthma, add hou po, chen pi to improve qi.
Note: In this formula, 1 qian = 3.75 grams (old measurement)
Warning: xi xin belongs to the Aristolochia family. This herb is very toxic to the kidneys.
小青龍湯
《傷寒論 》細辛一錢、乾薑錢半、五味子一錢、半夏三 錢、麻黃錢半、芍藥三 錢、 甘草錢半。
主治外感風寒、痰飲內停、感冒、咳嗽、支氣管炎、氣喘、浮腫、百日咳、涎沫、流淚。
本方常用於旺盛血行、去鬱血、減少粘膜炎症分泌、肺寒之喘咳、痰多者有效。本方有鎮咳定喘、強心利尿作用，對慢性支氣管氣喘特別有效。咽痛者可加桔梗。如咳喘較重加杏仁蘇子增強止咳平喘之力，如痰涎較多，加遠志茯苓化痰，如咳喘胸悶，加厚朴陳皮理氣。
大 青 龍 湯 治 表 有 寒 ， 裏 有 熱 症 。
小 青 龍 湯 主 治 表 裏 俱 寒 之 症 。
注意﹕細辛屬于馬兜鈴科﹐對腎臟有大毒。
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