• 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.

What other drugs will affect ferrous fumarate?

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.

Where can I get more information?

Your pharmacist can provide more information about ferrous fumarate.

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.