Rhubarb water cannot be drunk for a long time. Rhubarb has the effect of cooling the blood and detoxifying the toxin (referring to the treatment of blood-heat and toxicity), diarrhea and attacking the accumulation of efficacy, but the medication soaked in water to take a limited efficacy, and may not necessarily be able to play the above role. Rhubarb to medicinal rhubarb, Tangut rhubarb or palm leaf rhubarb dried rhizomes and roots into medicine. Rhubarb is bitter and cold in nature, and can enter the spleen, stomach, pericardium, liver and large intestine meridians. It has the efficacy of cooling the blood and detoxifying the toxin, diarrhea and attacking the accumulation of stagnation, clearing away heat and fire (clearing away heat and fire from the body), inducing dampness and removing the yellowish color, and expelling blood stasis and clearing away the menstruation. Rhubarb can be used to treat solid heat constipation, carbuncle (carbuncle that occurs in the intestines and bowels, manifested by fever, right abdominal pain, and palpable lumps), abdominal pain, red eyes and swollen throat, blood stasis and menstrual occlusion, and dysentery (dysentery due to dampness-heat evil) and other conditions. Rhubarb can be decocted and used externally, it is recommended to be used raw for diarrhea and stagnation, fried charcoal for stopping bleeding, and wine-roasted for activating blood circulation. The adverse effects of this drug are not clear, note that pregnant women, lactation and menstruation should not use rhubarb, and those with weak spleen and stomach should not use rhubarb. Rhubarb is bitter and cold, long service is afraid of damage to the spleen and stomach, in addition, this drug is a laxative, in order to get diarrhea to the extent that it can not be used excessively, so as to avoid damage to the positive qi, and therefore can not be taken for a long time. Rhubarb needs to be used under the guidance of a Chinese medicine practitioner, and should not be taken blindly on its own. In addition, the efficacy of soaking in water is limited, and it is recommended that patients with the above conditions go to the hospital in a timely manner and follow the doctor’s instructions for medication.