Ferumoxytol, which is sold under Feraheme, is indicated for the treatment of iron deficiency anemia. It is also used by patients who have anemia resulted from long-term kidney disease. According to the definition provided by drugs.com, iron deficiency anemia is basically “a lack of red blood cells caused by having too little iron in the body”. Bear in mind that your healthcare provider will give you Ferumoxytol as an infusion into a vein (IV). And after you receive it, they will watch you closely for at least 30 minutes to make sure you do not have an allergic reaction to the medicine, because Ferumoxytol can in some cases cause fatal allergic reactions. As for its common side effects, this drug causes diarrhea, nausea, dizziness, headache, and limb swelling. It also causes more serious side effects that require medical help such as slow heart rate, and severe dizziness. Remember to call your doctor before using this medication if you are pregnant or breastfeeding as it is still unknown whether Ferumoxytol can affect the fetus/ the nursing baby.