Understanding your iron needs
Pregnancy increases your daily iron requirement to 27 milligrams. Many prenatal vitamins contain iron, but some—including some gummies—do not. Treatment for diagnosed iron deficiency may require a different amount. ACOG: Pregnancy nutrition
When and how to take iron
Follow the prescribed dose and schedule. The amount of elemental iron, or usable iron, differs among products.
- Iron absorbs best on an empty stomach, but a small meal may help if it causes nausea.
- Separate iron from calcium supplements, antacids, and milk by at least two hours.
- Avoid taking it with coffee or tea.
- Ask a pharmacist about spacing from thyroid medicine and other prescriptions.
Vitamin C–containing foods can help iron absorption. A separate vitamin C pill is not automatically necessary. MedlinePlus: Taking iron supplements
Side effects and follow-up
Constipation, nausea, and darker stools are common. Your OB may change the formulation or schedule if needed. Blood tests help show whether treatment is working.
Do not stop simply because you feel better; replacing iron stores takes time. Keep all iron products out of children’s reach because overdose can be dangerous. MedlinePlus: Iron medicines
Frequently asked questions
Is morning or bedtime better?
Choose a time that fits the prescribed schedule and allows proper spacing from food and other medicines.
When should I call?
Call for persistent vomiting, severe constipation, or difficulty taking treatment. Black, sticky, tar-like stools—especially with weakness or pain—need prompt assessment.
Questions about your pregnancy? Contact Davie ObGyn in Davie, Florida, at 954-880-1010. New and established patients are welcome. This information supports your prenatal care and does not replace an individual medical assessment. For urgent symptoms, call your care team promptly; for an emergency, call 911. Do not use a routine online message for urgent symptoms.
Medically reviewed by Rahil Malik, MD, FACOG, board-certified obstetrician-gynecologist. Last reviewed: September 26, 2026. This page is general information and does not replace a visit with your doctor.