Ferrous sulfate (iron)

Overview

It can take 2 to 3 months or longer to rebuild iron stores. Find out why iron is low, especially if you have heavy periods or stomach bleeding.

What it's used for

• Iron-deficiency anemia
• Low iron in pregnancy

How to take it

• Take it on an empty stomach if you can, or with a small amount of food if it upsets your stomach. Vitamin C or orange juice can help absorption.
• Some providers recommend taking it every other day.
• Separate it by 2 hours from antacids, calcium, dairy, tea, coffee, and some antibiotics and thyroid medicine.

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

• Dark or black stools (expected)
• Constipation
• Nausea or stomach upset

Warnings

• Keep it locked away from children.
• Don't take iron unless you need it; too much can build up.

Other medicines, foods, and alcohol

• It lowers absorption of levothyroxine, some antibiotics (doxycycline, ciprofloxacin), and levodopa.
• Antacids, calcium, and PPIs lower iron absorption.

Tell your provider and pharmacist about every medicine, vitamin, and supplement you take.

Pregnancy and breastfeeding

Commonly recommended in pregnancy when iron is low.

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

• Iron-deficiency anemia
• Anemia (low red blood cells)