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Medications and Drugs

Brand Names: GastroMARK

Generic Name: ferumoxsil (Pronunciation: fer yoo MOX il)

What is ferumoxsil (GastroMARK)?

Ferumoxsil is in a group of drugs called imaging contrast agents. Ferumoxsil contains iron, a substance that is magnetic. Contrast agents are used to allow certain internal organs to be seen clearly on an MRI (magnetic resonance imaging).

Ferumoxsil is used to help diagnose certain disorders of the stomach or intestines.

Ferumoxsil may also be used for purposes other than those listed in this medication guide.

What are the possible side effects of ferumoxsil (GastroMARK)?

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 at once if you have any of these serious side effects:

  • severe stomach pain or cramping; or
  • skin rash, bruising, severe tingling, numbness, pain, muscle weakness.

Less serious side effects are more likely to occur, such as:

  • mild stomach pain, nausea, vomiting, diarrhea;
  • upset stomach;
  • skin rash or itching;
  • headache; or
  • numbness or tingling in or around your mouth.

Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about ferumoxsil (GastroMARK)?

Do not receive this medication if you are allergic to ferumoxsil, or if you have a blocked or perforated intestine.

Before receiving this medication, tell your doctor if you are allergic to any drugs, if you have an iron overload disorder (such as chronic hemolytic anemia) or if you have received frequent blood transfusions. Also tell your doctor if you have a history of hiatal hernia, gastroesophageal reflux disease (GERD), inflammatory bowel disease, or if you have recently had any nausea, vomiting or diarrhea.

After receiving ferumoxsil, call your doctor at once if you have severe stomach pain or cramping, or a skin rash with bruising, severe tingling, numbness, pain, and muscle weakness.

Less serious side effects are more likely to occur, such as mild stomach pain, nausea, vomiting, diarrhea, headache, or numbness and tingling of your mouth.



Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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