Rinzhengmangjue after taking black stools need to clarify what causes, if due to the consumption of animal blood, liver and other foods during the medication is a normal phenomenon, if due to disease or medication caused by the phenomenon is not normal. Renqing Mangjue is composed of Hairy Chebula, Cattail, Crocus sativus, Niu Huang, Musk, Cinnabar, etc. It can clear away heat and detoxify the toxin (remove heat and poisonous evils from the body), benefit the liver and nourish the stomach, brighten the eyes and awaken the mind, heal sores, nourish and strengthen the body. It is used for various poisoning diseases such as natural poison, food poison, prepared poison; peptic ulcer, acute and chronic gastroenteritis, atrophic gastritis, ascites, leprosy, etc. The adverse reactions and contraindications of this drug are not known. The occurrence of black stools after taking Rinzhengmangjue needs to be clarified for the cause of the disease. If black stools may occur due to the consumption of animal blood, liver, spinach, etc., it is a normal phenomenon; if the black stools are caused by gastrointestinal hemorrhage, further examination is also needed to determine what causes the problem. Patients are advised to take symptomatic treatment under the guidance of a doctor.