Iron supplementation may have side effects, including:
Stomach pain and cramping
Nausea and vomiting
Talk to your doctor if you are taking iron and experience any of the above symptoms.
If you take iron, overdose and toxicity are possible, so it's important you work with your doctor once you are diagnosed with iron-deficiency anemia. Complications of iron overdose include:
Black or bloody stool
Work with your doctor to carefully control iron dosage. Your doctor will also likely recommend regular blood tests to monitor your condition.