Lactobacillus tablets do not usually cause a change in stool color. If the darkening of stool color occurs after taking this drug, no special treatment is needed if it is caused by physiological reasons such as eating spinach. If the deepening of stool color is caused by gastrointestinal bleeding, drugs such as omeprazole and thioglycollate can be used to inhibit the secretion of gastric acid and protect the mucosa of the gastrointestinal tract. Lactobacillin tablets can be used to improve abnormal fermentation in the intestines, treat enteritis, pediatric diarrhea, dyspepsia and so on. The color of stool is usually yellow under normal circumstances, and taking the drug does not usually cause a change in stool color. The appearance of darker stool color, if the drug is often eaten during the period of spinach and other foods, causing darker stool color, usually dark green. This is a normal physiological phenomenon and can be relieved by a change in diet. If gastritis, gastric ulcer and other diseases caused by bleeding caused by black stool. You can use omeprazole, rabeprazole and so on to inhibit the secretion of gastric acid and reduce the stimulation of gastric acid on the damaged mucosa, and you can also use aluminum thioglycollate, magnesium aluminum carbonate and so on to protect the mucosa and promote the repair of the damaged mucosa. It is recommended that patients should consult a doctor when discomfort occurs after taking the medication. Drugs need to be used under the guidance of a doctor.