【Nature and flavor and meridians】Bitter, cold.
 [Functions and indications] It can clear away heat and toxicity, break up stagnation, and promote blood stasis. It can treat constipation due to excess heat, delirium, food stagnation, initial onset of dysentery, tenesmus, stasis and amenorrhea, accumulation of stagnation, epidemic heat, sudden eye pain, hematemesis, epistaxis, jaundice, edema, stranguria, urinary incontinence, carbuncle, furuncle, and burns caused by hot water or fire. It can clear away heat and promote bowel movement, cool blood and detoxify, and remove blood stasis and promote menstruation. It can be used for constipation due to excess heat, abdominal pain due to stagnation, discomfort caused by diarrhea, and jaundice caused by damp heat.
 【Usage and Dosage】Oral administration: decoction (for purgation, not suitable for long-term decoction), 1-4 qian; or into pills or powder. External use: grind into powder, mix with water or vinegar for application.
 [Precautions] It should be taken with caution when the external symptoms have not subsided, blood is deficient and qi is weak, the spleen and stomach are cold, there is no real heat, stagnation or blood stasis, as well as before and after pregnancy.
 【Medical records】
 "Ben Jing": It can remove blood stasis, blood stasis, cold and heat, break up accumulation of tumors and masses, remove retained food and drink, cleanse the intestines and stomach, eliminate the old and bring in the new, promote the flow of water and food, regulate the middle and digest food, and calm and harmonize the five internal organs.
 "Bielu": It soothes the stomach, relieves gas, eliminates phlegm, relieves heat in the intestines, distension in the heart and abdomen, cold blood retention in women, lower abdominal pain, and all kinds of old blood retention.
 "Material Treatise": It can treat cold and heat, help digestion, refine the five internal organs, regulate women's menstruation, relieve edema, break up phlegm, cold and heat accumulation, treat food stagnation, benefit the large and small intestines, and treat heat toxic swellings; it can also treat cold and heat diseases in children, irritability, pus erosion, and blood retention.
 "Bencao Gangmu" (Bencao Gangmu): It can clear all kinds of Qi, regulate blood vessels, benefit joints, relieve stagnation, water vapor, cold and hot imbalance of limbs, warm miasma and hot phlegm, benefit urination and defecation, and can also be used to treat sores, boils, and carbuncle.
 "Compendium of Materia Medica": It is mainly used to treat diarrhea of white color, abdominal pain, dribbling urination, dryness due to excess heat, hot flashes and delirium, jaundice, and various fire sores.
 【Predecessors release medicine】
 "Bencao Jingshu" says: All blood stasis is due to blood deficiency, not to heat accumulation; cold and heat are due to yin deficiency, not to blood stasis; abdominal masses are due to spleen and stomach weakness, not to stagnation; constipation is due to blood deficiency and dry intestines, not to heat stagnation; fullness in the heart and abdomen is due to spleen deficiency and poor circulation of qi, not to stagnation of diet; pain in the lower abdomen of women is due to blood deficiency in the jueyin meridian, not to menstrual blockage and old blood stasis; vomiting and epistaxis are due to yin deficiency fire rising from below, burning above, blood heat running wildly, overflowing from the upper orifices, not due to real heat in the blood; falling due to kidney deficiency and dampness taking advantage of the weakness to invade, not due to real evil of dampness and heat; breast abscess and swelling are due to the reversal of qi in the body, which causes depression and discomfort, so that the nutrient qi cannot follow and goes against the flesh, causing abscesses, not due to changes in rich food; large boils on the feet are caused by accumulated heat in the blood, so they are avoided by the method because they damage the stomach qi.
 "New Compendium of Materia Medica": Rhubarb, bitter in taste, cold in nature, yin among yin, descending, non-toxic. Enters the stomach and large intestine. However, with adjuvants, all meridians are reached. It is very fast in nature, running but not staying, good at clearing stagnation, regulating the middle and digesting food, promoting water and food, removing the old and bringing in the new, guiding blood stasis, rolling phlegm, breaking knots, dispersing hard masses, stopping pain, defeating carbuncle heat toxins, and reducing swelling, all of which are as good as gods. If you want it to rise, you must add wine; if you want it to go down, you must add Glauber's salt; if you want it to run fast, it is better to use it raw; if you want it to be balanced, it is best to cook it. If you want it to stay a little, use licorice to slow it down. This medicine has the swiftness of moving forward courageously, the magical power of pushing hardness and clearing accumulation, the product of Zhending and calming chaos, and the medicine of expelling evil and saving life. But when using it, you must see the symptoms very clearly, and then the medicine is very effective, otherwise, it will kill people at the door. Rhubarb is the medicine of the monarch, so it is called the general. However, the general is not as virtuous as the counselor, and does not use both suppression and appeasement. He is brave but not kind. Therefore, ginseng and angelica must be added to Chengqi Decoction to help it. Other rhubarb is not without the taste of replenishing qi and blood. However, the medicine for replenishing qi should not be added too much, and the medicine for replenishing blood should be used in large quantities. Because the stomach and intestines are dry and congested, and then the stasis cannot move, rhubarb is used to remove it, but the intestines are dry and there is no water to clear the boat. Although rhubarb is brave, how can it row a boat on land? Therefore, whenever there is stagnation, more tonics must be used to make it produce blood to remove the old and break the stasis to bring in the new. As for the medicine for replenishing qi, it seems that it can be stopped, but I don’t know that blood must be easy to produce with qi, and rhubarb is used to remove it, which will inevitably damage the qi of the stomach and intestines. I first use ginseng and to replenish it, so that the qi is not damaged, and it helps the power of rhubarb, which is easy to push, and the evil is removed without hurting the righteousness. There is no need to go and save it after it has been taken.