Colloidal pectin bismuth during the taking of stool is usually yellow, dark brown, this is a normal situation, medication should follow the doctor’s instructions. Colloidal bismuth belongs to gastric mucosa protection drug, suitable for the treatment of peptic ulcer (especially Helicobacter pylori-related ulcer), chronic superficial or atrophic gastritis and so on. Contraindications to use include those with severe renal insufficiency. Taking granules or dry suspension may cause adverse reactions such as nausea and constipation. Normal feces are usually yellow, but the feces discharged after taking the drug may also be lusterless dark brown, but usually not accompanied by other discomforts, which is a normal reaction, and can be changed to the normal fecal color within 1 to 2 days after stopping the drug. The specific use of drugs should be under the guidance of specialists, not unauthorized use of drugs.