Introduction: This systematic review and meta-analysis aims to explore the influence of ferumoxytol versus placebo on iron deficiency anemia. Methods: We search for randomized controlled trials (RCTs) assessing the effect of ferumoxytol on iron deficiency anemia on PubMed, EMbase, Web of science, EBSCO, and Cochrane library databases. This meta-analysis is performed using the random-effects model. Results: Four RCTs are included in the meta-analysis. Compared with the control group for iron deficiency anemia, intravenous ferumoxytol can significantly improve the proportion of patients with a ≥20 g/L hemoglobin (Hb) increase (RR = 18.43; 95% CI = 7.29–46.57; p < 0.00001), the proportion of patients with an Hb level ≥120 g/L (RR = 18.55; 95% CI = 8.66–39.72; p < 0.00001), transferrin saturation (mean difference = 11.08; 95% CI = 9.86–12.31; p < 0.00001) and FACIT-fatigue score (mean difference = 4.60; 95% CI = 3.21–6.00; p < 0.00001), but has no remarkable influence on adverse events (RR = 1.33; 95% CI = 0.84–2.10; p = 0.22), serious adverse events (RR = 1.22; 95% CI = 0.74–2.02; p = 0.44), and death (RR = 0.32; 95% CI = 0.05–1.95; p = 0.22). Conclusions: Intravenous ferumoxytol can provide the important benefits for iron deficiency anemia.

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