Carbonyl iron Side Effects
For the Consumer
Applies to carbonyl iron: oral tablet chewable
Other dosage forms:
What are some side effects that I need to call my doctor about right away?
WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:
- Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
- Black, tarry, or bloody stools.
- Very upset stomach or throwing up.
- Very bad belly pain.
- Throwing up blood or throw up that looks like coffee grounds.
What are some other side effects of this drug?
All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:
- Upset stomach or throwing up.
- Not hungry.
- Hard stools (constipation).
- Change in color of stool to green.
- Loose stools (diarrhea).
- Belly pain.
- Stomach cramps.
These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.
You may report side effects to the FDA at 1-800-FDA-1088. You may also report side effects at http://www.fda.gov/medwatch.
For Healthcare Professionals
Applies to carbonyl iron: oral suspension, oral tablet, oral tablet chewable
Gastrointestinal side effects have been reported the most frequently. They have included diarrhea (45%) vs. placebo (3%), cramping (38%) vs. placebo (0%), nausea (30%) vs. placebo (8%), constipation (25%) vs. placebo (14%), heartburn (17%) vs. placebo (6%), and epigastric discomfort (16%) vs. placebo (11%).[Ref]
Iron overload (i.e., hemosiderosis) has been reported in patients genetically predisposed, or have underlying disorders, that augment the absorption of iron. It has also occurred following administration of excessive parenteral iron therapy, combination of oral and parenteral iron, or in patients with hemoglobinopathies that were erroneously diagnosed as iron deficiency anemia. Hemosiderosis is treated with repeated phlebotomy or long-term administration of deferoxamine. The liver is particularly susceptible to toxicity in iron-overload states.
Stained teeth have been reported primarily following ingestion of iron liquid preparations. Liquid dosage forms should be diluted in juice or water and sipped through a straw to aid in prevention of staining.[Ref]
Other side effects have included iron overload (hemosiderosis) and stained teeth. Secondary hemochromatosis due to prolonged iron ingestion has been reported rarely. An unpleasant taste following carbonyl iron ingestion has been reported in 40% to 70% of patients.[Ref]
1. "Product Information. Feosol Caplets (carbonyl iron)" SmithKline Beecham, Philadelphia, PA.
2. Devasthali SD, Gordeuk VR, Brittenham GM, Bravo JR, Hughes MA, Keating LJ "Bioavailability of carbonyl iron: a randomized, double-blind study." Eur J Haematol 46 (1991): 272-8
3. Gordeuk VR, Brittenham GM, Hughes M, Keating LJ, Opplt JJ "High-dose carbonyl iron for iron deficiency anemia: a randomized double-blind trial." Am J Clin Nutr 46 (1987): 1029-34
4. Gordeuk VR, Brittenham GM, McLaren CE, Hughes MA, Keating LJ "Carbonyl iron therapy for iron deficiency anemia." Blood 67 (1986): 745-52
5. Gordeuk VR, Brittenham GM, Hughes MA, Keating LJ "Carbonyl iron for short-term supplementation in female blood donors." Transfusion 27 (1987): 80-5
Some side effects may not be reported. You may report them to the FDA.
More about carbonyl iron
- During Pregnancy
- Dosage Information
- Drug Interactions
- Support Group
- En Español
- Drug class: iron products