Background Iron deficiency anemia is a disease that can significantly compromise a patient's quality of life. Desensitization is a safe and effective treatment option for iron-deficient anemic patients who require intravenous iron despite their hypersensitivity to iron. This report describes a safe desensitization protocol for patients with iron hypersensitivity who require iron treatment for their clinical improvement.Case presentation Two patients of 20 and 46-year-old diagnosed with secondary iron deficiency anemia hipermenorreas and a clinical history of fail treatment with oral iron, who presented a reaction of the anaphylactic type while they receive iron parenteral sucrose. Therefore, the patients were treated with the desensitization protocol applied for patients with hypersensitivity to iron.Conclusion Iron deficiency anemia is a disease that can significantly compromise the quality of life of patients. The desensitization protocol for patients with hypersensitivity to iron is a safe and effective treatment option for patients with a history of allergy to intravenous iron. This case report shows the usefulness to use the desensitization protocol for patients with hypersensitivity to iron.