Consumption of Patchouli Zhengqi Pill will not make the stool black. Patchouli Zhengqi Pill is mainly composed of patchouli, Atractylodes macrocephala, Pericarpium Citri Reticulatae, Perilla frutescens, Angelica dahurica, Semen Armeniacae, Platycodonis, Poria, Poria, Huperzia, Picrices of the Great Abdomen, and Jujubae. It has the efficacy of relieving surface and resolving dampness (relieving external evils and dispelling internal dampness), regulating qi and harmonizing the middle (regulating the qi of the spleen and stomach, so as to make the functions of the spleen and stomach smooth). It is often used in the treatment of summer-dampness cold, malignant cold (fear of cold) and fever, headache, chest tightness, diarrhea and vomiting, and distension and pain in the epigastrium (abdomen). The adverse reactions and contraindications of Haoxiang Zhengqi Wan have not been clarified. While taking the medicine, a light diet of well-digested food is recommended. Spicy and stimulating, greasy, raw and cold foods are not recommended. Those who are allergic to the ingredients of this medicine are not recommended to take it. Black stools may be due to the consumption of some black foods, such as bamboo charcoal powder and blood products. There may also be gastrointestinal bleeding. The use of the drug needs to be under the supervision of a physician. If black stools occur and there is no relief within a few days, it is recommended to go to the hospital in time.