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• Interactions

The following drugs can interact with ferrous fumarate. Tell your doctor if you use any of the following:

• acetohydroxamic acid (Lithostat);

• cimetidine (Tagamet);

• deferoxamine (Desferal);

• etidronate (Didronel);

• dimercaprol (an injection used to treat poisoning by arsenic, lead, or mercury);

• penicillamine (Cuprimine); or

• pancrelipase (Cotazym, Creon, Ilozyme, Pancrease, Ultrase).

This list is not complete and there may be other drugs that can interact with ferrous fumarate. Tell your doctor about all your prescription and over-the-counter medications, vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start a new medication without telling your doctor.

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor if you have serious side effects such as:

• bright red blood in your stools; or

• pain in your chest or throat when swallowing a ferrous fumarate tablet.

Less serious side effects may include:

• constipation, diarrhea;

• nausea, vomiting, heartburn;

• stomach pain, upset stomach;

• black or dark-colored stools or urine; or

• temporary staining of the teeth.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.