Taking colloidal bismuth pectin capsules without black stools may be caused by the patient taking a smaller dose or eating a large amount of vegetables. Colloidal bismuth pectin capsules are used for the treatment of chronic gastritis and other diseases, allergy is prohibited. Patients who do not have the phenomenon of blackened stools after taking colloidal bismuth pectin capsules are generally normal, if patients take a smaller dose, it will lead to uneven distribution of colloidal bismuth pectin in the intestinal tract, so it can be not appear the phenomenon of blackened stools. In addition, it is also possible that the patient in the drug during the consumption of too many vegetables, the body chlorophyll increased, defecation will not appear to show the phenomenon of black stools. Colloidal bismuth pectin capsules are mainly used to treat chronic gastritis, and can also be used to relieve stomach pain, heartburn and acid reflux caused by excessive stomach acid. It is prohibited for those who are allergic to colloidal bismuth pectin capsules to prevent allergic symptoms such as respiratory distress, shock and generalized red rash. It is normal for patients to take colloidal bismuth pectin capsules without blackened stools, and patients should take the medication as prescribed by the doctor. The appearance of dark brown stools, but no other discomfort is also normal. The color of feces turns to normal within 1-2 days after stopping the medicine.