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GastroMARK Side Effects

Generic name: ferumoxsil

Note: This document contains side effect information about ferumoxsil. Some dosage forms listed on this page may not apply to the brand name GastroMARK.

Applies to ferumoxsil: oral suspension.

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.

Get emergency medical help if you have any of these signs of an allergic reaction while taking ferumoxsil (the active ingredient contained in GastroMARK) 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:

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

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.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.

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