Slow FE Fer-In-Sol (ferrous sulfate) For maximum absorption take on empty stomach but may take with or after meals to minimize GI irritation Vitamin C may enhance absorption Adverse Effects Frequency Not Defined Nausea Vomiting Gastrointestinal irritation Constipation Contact irritation Diarrhea Stomach pain Dark stools Urine discoloration Gastrointestinal hemorrhge (rare) Gastrointestinal obstruction (wax matrix products; rare) Gastrointestinal perforation (rare) Superficial tooth discoloration (oral solutions) Contraindications & Cautions Black Box Warnings Severe iron toxicity may occur in overdose especially when ingested by children. Nonintentional iron overdose is the leading cause of fatal poisoning in children younger than 6 years. Keep out of reach of children.