Positives

• One ME/CFS forum member reported completing four iron IV infusions over two months without any noticeable side effects, which she credited to a newer-generation iron product (such as iron sucrose or ferric carboxymaltose) rather than the older iron dextran formulations Phoenix Rising.
  
  

Negatives

• A patient reported a severe reaction to a 300 mg iron IV including migraine, malaise, elevated temperature, and swollen legs, and was told by her clinician that these post-infusion reactions could last up to a week Phoenix Rising.
  
  
• Forum members repeatedly warned that artificially raising ferritin can worsen ME/CFS symptoms in some patients because excess iron feeds intracellular infections common in the patient population, so routine iron IVs based only on a borderline ferritin are not always appropriate Phoenix Rising.
  
  

Hurdles & Side Effects

• IV iron is appropriate when oral iron cannot be absorbed (due to MCAS, IBD, atrophic gastritis, or post-bariatric anatomy) or when deep ferritin depletion has to be corrected quickly; forum members recommend the newer iron products (iron sucrose, ferric carboxymaltose) over iron dextran because of the much lower anaphylaxis rate Phoenix Rising.