Constipation from iron pills during pregnancy

Iron can make stools firmer and slow the movement of contents through the bowel. Pregnancy hormones can also reduce bowel movement, while pressure from the growing uterus may add to the sensation of fullness. Dark stools can occur with iron and are different from black, tarry stools that look sticky or are accompanied by weakness.

Drink regularly unless your maternity clinician has limited your fluids. Add fibre gradually through vegetables, fruit, whole grains, beans, and nuts, and keep moving with comfortable walking if you are able. Take iron exactly as prescribed; do not stop it or change the dose without discussing your blood results and an alternative formulation with your obstetric clinician. A pharmacist or doctor can advise whether a pregnancy-appropriate stool softener or other laxative is suitable.

Seek prompt medical advice for severe or worsening abdominal pain, repeated vomiting, a swollen abdomen, inability to pass stool or gas, blood in the stool, or black tarry stool. Contact your clinician if constipation persists despite self-care, interferes with eating or sleeping, or began soon after a new iron product. Dizziness, very dark urine, or reduced urination may signal dehydration and also deserves advice.

Ask whether your iron dose and formulation still suit your blood results, whether taking it at a different time is appropriate, and which bowel treatment is compatible with your pregnancy. Mention other medicines, supplements, thyroid symptoms, and how long the constipation has lasted.