Constipation after iron supplementation is mainly considered as an adverse drug reaction, which can be intervened by adjusting daily dietary habits, increasing water intake, and using laxative drugs under the guidance of a doctor. The human body in the process of iron supplementation, will to a certain extent affect the gastrointestinal function, resulting in gastrointestinal peristalsis and digestive function is weakened, may cause constipation, dyspepsia and so on the occurrence of the situation, belong to the adverse drug reaction. This kind of situation can be improved through daily dietary adjustments, increase water intake, eat more fresh fruits and vegetables, increase dietary fiber and other nutrients intake. If the symptoms are more serious, under the guidance of a doctor to use lubricating laxatives, osmotic laxatives to intervene, such as lactulose, polyethylene glycol, etc., this kind of drug may cause the body to appear abdominal pain, nausea and other adverse reactions, the drug components of allergies over the serious liver dysfunction is prohibited. If the symptoms of constipation are not relieved after iron supplementation, or if they are accompanied by other symptoms, you should go to the hospital in time to see a doctor and give targeted treatment after clarifying the cause.