Shegan Mahuang Decoction and Xiaoqinglong Decoction are both prescriptions for relieving exterior syndrome, but Shegan Mahuang Decoction is mainly used for treating exterior syndrome of cold, which is caused by phlegm stagnation and lung qi ascending. Therefore, on the basis of Xiaoqinglong Decoction, some drugs such as Shegan, Donghua and Aster, which can eliminate phlegm and benefit the lung, relieve cough and relieve asthma, are added. It can be seen that Xiaoqinglong Decoction is mainly used for treating exterior syndrome, and has great power of relieving exterior syndrome and dispelling cold.

The composition of Shegan Mahuang Decoction and Xiaoqinglong Decoction is different.

1, Shegan Mahuang Decoction: Shegan Mahuang Decoction consists of Shegan Mahuang Decoction, Herba Ephedrae, Ginger, Herba Asari, Radix Asteris, Flos Farfarae, Fructus Jujubae, Rhizoma Pinelliae and Fructus Schisandrae Chinensis.

2. Xiaoqinglong Decoction: Xiaoqinglong Decoction consists of Herba Ephedrae, Radix Paeoniae, Herba Asari, Zingiberis Rhizoma, Radix Glycyrrhizae, Ramulus Cinnamomi, Fructus Schisandrae Chinensis and Rhizoma Pinelliae.

Shegan Mahuang Decoction and Xiaoqinglong Decoction have different usages.

1, Shegan Mahuang Decoction: 9 grams of Belamcanda, 0/2 grams of Ephedra, 0/2 grams of ginger/kloc, 9 grams of Asarum, 9 grams of Aster, 9 grams of Farfara Flos, 7 jujubes, 9 grams of Pinellia ternata and 3 grams of Schisandra chinensis. Boil Ephedra twice first.

2. Xiaoqinglong Decoction: Herba Ephedrae10-15g, Radix Paeoniae15g, Herba Asari 3-6g, Rhizoma Zingiberis10-0/5g, and Radix Glycyrrhizae/kloc. Pinellia ternata10-15g, with a bucket of water, first boil ephedra, reduce 2 liters, remove the foam, boil 3 liters, remove me, and take 1 liter warm.

Shegan Mahuang Decoction and Xiaoqinglong Decoction have different effects.

1, Shegan Mahuang Decoction: Shegan Mahuang Decoction has the effects of dispersing lung qi, eliminating phlegm, lowering qi and relieving cough, and is mainly used for symptoms such as stagnation of phlegm, asthma and cough due to adverse qi, cough with upper qi, croaking in the throat, stuffy chest diaphragm, spitting, white or greasy fur, and tight or heavy pulse.

2. Xiaoqinglong Decoction: Xiaoqinglong Decoction has the effects of relieving exterior syndrome and dispelling cold, warming the lungs and resolving drinks. It is mainly used to treat symptoms such as exterior cold syndrome, aversion to cold and fever, head and body pain, anhidrosis, asthma and cough, thin and heavy sputum, chest swelling, or retching, or phlegm and asthma and cough, inability to lie down, or heavy body pain, edema of head, face and limbs, white and slippery tongue coating, and floating pulse.