IV Iron Dextran Treatments

I was treated approximately 4 years ago with a series of 13 treatments of IV iron dextran for severe iron deficency anemia. I am unable to tolerate oral iron therapy due to a gastric ulcer. I have become anemic again. What are the risks of anaphylaxis occuring with repeated IV treatments?  If this is not an option, what other treatments would be available? Thank you for your assistance.