Overview
Start at least 1 month before trying to get pregnant to lower the risk of brain and spine birth defects.
What it's used for
- Before pregnancy, during pregnancy, and while breastfeeding
How to take it
- Take one daily. Taking it with food or at bedtime can lower nausea.
- Choose one with at least 400 mcg of folic acid and about 150 mcg of iodine.
Your dose depends on your health and other medicines. Always follow your prescription label, and ask your pharmacist if anything is unclear.
Side effects
Common side effects
- Nausea
- Constipation
- Dark stools (from iron)
Warnings
- Don't take extra vitamin A supplements in pregnancy.
- Keep them away from children.
Other medicines, foods, and alcohol
- Iron and calcium lower absorption of levothyroxine and some antibiotics; separate them.
Tell your provider and pharmacist about every medicine, vitamin, and supplement you take.
Pregnancy and breastfeeding
Recommended before and during pregnancy.
Missed doses, overdose, and storage
If you miss a dose
Take it as soon as you remember, unless it's almost time for your next dose. Then skip the missed dose. Don't take two doses at once.
If someone takes too much
Call Poison Control at 1-800-222-1222 or get help online at poison.org. Call 911 if the person collapses, has a seizure, has trouble breathing, or can't be woken.
Storing it
Store at room temperature, away from heat and moisture (not in the bathroom), and out of reach of children and pets.
Conditions it's used for
Sources
- DailyMed: FDA drug label for Prenatal vitamins (U.S. National Library of Medicine)
- MedlinePlus: Drugs, herbs, and supplements
- FDA: Drugs@FDA
Last updated 2026-11-13.