The iron agent undergoes hydrogen sulfide binding in the body in the intestines, at which point a black iron sulfide gradually develops, resulting in green colored stools.
The stool develops a dark green color during defecation, which is caused by the binding of iron to hydrogen sulfide in the intestines. If the body is frequently anemic, it is necessary to take iron supplements under the supervision of a doctor. When the iron dose is too high, the excess iron is not fully absorbed in the intestines as it is excreted from the body in the stool, causing the patient to have dark green colored stools.
This symptom is a normal manifestation and usually does not need to be treated. When the patient stops the medication, the stool color will gradually return to normal and is not harmful to the body. If the color of the stool does not return to normal after stopping the medication, it is recommended to consult the hospital in time.