CKD patient on dialysis twice a week. But continued black stool for more than 15 days 5 unit transfusion already done Gastro consulted and done endoscopy and colonoscopy but no source of bleeding seen as per gastro doctor Now I want give prescription to stop black stool or change the color of stool My mother not having iron supplements So plss prescribe a good medicine to heal intestine and stop bakck stool.