Iron Supplementation in Patients with Active Infection

Introduction to IV Iron Recommendations

The National Comprehensive Cancer Network (NCCN), American College of Hematology, KDIGO, and British Society of Gastroenterology recommend avoiding or suspending IV iron during active infections, due to potential interference with antibiotic efficacy and increased risk of infection (RR, 1.26; 95% CI, 1.09-1.44) 1, 2, 3, 4

IV iron is associated with a 16% increased risk of infection compared to oral iron or no iron (RR, 1.16; 95% CI, 1.03-1.29) in a population of 32,762 participants, which translates to approximately 16 more infections per 1,000 patients receiving IV iron 1
In patients with inflammatory bowel disease, IV iron is associated with a particularly strong increased risk of infection (RR, 1.73; 95% CI, 1.11-2.71) 1
Iron is required for growth by almost all human pathogens, providing a biological basis for the increased infection risk with IV iron administration, and free iron can convert benign bacterial colonization into virulent infection 1, 2

IV iron is associated with increased hemoglobin levels (MD, 0.57 g/dL; 95% CI, 0.50-0.64 g/dL) and reduces the need for red blood cell transfusions (RR, 0.83; 95% CI, 0.76-0.89) compared to oral iron or no iron 1
IV iron improves treatment response rates compared to oral iron or no iron (RR, 1.46; 95% CI, 1.32-1.60) in patients receiving IV iron 1

When a patient has both iron deficiency and active infection, the first priority should be to complete antibiotic treatment and resolve the infection, then consider iron supplementation once the infection is fully resolved 4
Consider oral iron supplementation instead of IV iron during active infection, and note that separate oral iron administration from certain antibiotics (such as tetracyclines, ciprofloxacin) by at least 2-3 hours due to decreased bioavailability 1, 4
IV iron should not be administered concurrently with antibiotics, and patients with active infection should not receive IV iron therapy until the infection has completely resolved, according to the NCCN guidelines 4
The recommended approach when both IV iron and antibiotics are clinically indicated is to complete the antibiotic course first, wait until the infection is fully treated and resolved, and then administer IV iron, with consideration of oral iron or erythropoiesis-stimulating agents (ESAs) in combination with minimal IV iron in non-urgent or urgent cases, respectively 1, 5, 6, 4
Coordinate the timing of antibiotics, IV iron, and chemotherapy carefully to minimize the risk of infection, according to the NCCN guidelines, with specific consideration for patient populations such as:

Patient Population	Recommendation
General	Avoid IV iron during active infection
Hemodialysis patients	Delay IV iron until infection resolves, even in patients with functional iron deficiency
Cancer patients	Coordinate timing of antibiotics, IV iron, and chemotherapy carefully
Patients with inflammatory bowel disease or chronic kidney disease	Consider specific timing protocols for oral iron or IV iron administration

5, 6, 7, 4