Accidental overdose of iron-containing products is a leading cause of fatal poisoning in children younger than 6 years. Keep this product out of reach of children. If overdose does occur, get medical help right away or call a poison control center.

Constipation, diarrhea, stomach cramps, or upset stomach may occur. These effects are usually temporary and may disappear as your body adjusts to this medication. If any of these effects last or get worse, contact your doctor or pharmacist promptly. Iron may cause your stools to turn black, an effect that is not harmful. If your doctor has prescribed this medication, remember that your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist. In the US - Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch. In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

This product can decrease the absorption of other drugs such as bisphosphonates (for example, alendronate), levodopa, penicillamine, quinolone antibiotics (for example, ciprofloxacin, levofloxacin), thyroid medications (for example, levothyroxine), and tetracycline antibiotics (for example, doxycycline, minocycline). Separate your doses of these medications as far as possible from your doses of this product. Ask your doctor or pharmacist about how long you should wait between doses and for help finding a dosing schedule that will work with all your medications. Avoid taking this medication at the same time as antacids. Wait at least 2 hours between taking this medication and an antacid. If your brand of iron also contains folic acid, be sure to tell your doctor or pharmacist if you take certain anti-seizure drugs (for example, hydantoins such as phenytoin). This medication may interfere with certain lab tests (such as fecal occult blood tests), possibly causing false test results. Make sure lab personnel and all your doctors know you use this drug.