Ferrous Gluconate Side Effects

Possible side effects of ferrous gluconate are listed below. Call your doctor if these side effects are severe or do not go away in a few days.

• Gastrointestinal discomfort
• Stomach cramping
• Heartburn
• Nausea
• Vomiting
• Diarrhea
• Constipation
• Staining of the teeth
• Discoloration of urine 
• Dark stools

Rarely ferrous gluconate can cause more serious side effects. Call your doctor immediately or seek emergency medical attention if you develop an allergic reaction with skin rash, itching, hives, swelling of the lips, tongue, or throat, difficulty breathing or swallowing, or any other unusual symptoms after taking iron supplement tablets.

The above list may not include all the potential side effects of ferrous gluconate. Tell your doctor if the side effects are unusual or severe or last more than a few days. You can also report unusual side effects to the Food and Drug Administration at 1-800-FDA-1088.

Ferrous gluconate Overdose: In case of an overdose of ferrous gluconate, call your doctor immediately. You can also call the National Poison Control Center at 1-800-222-1222. Call 911 if a person has difficulty breathing, cannot be awakened, has collapsed, or has had a seizure. An overdose of iron may cause stomach pain, vomiting, and diarrhea. An accidental overdose of iron-containing products can lead to fatal poisoning in young children.

Source: FDA