Pure red cell aplasia during carbamazepine monotherapy.

A 7-year-old girl developed pure red cell aplasia during carbamazepine (CBZ) monotherapy for epilepsy. She developed generalized clonic convulsions at the age of 7 years and 8 months. Treatment with CBZ was begun. Two months later she was admitted to our hospital because of severe anemia. Bone marrow examination revealed the almost complete absence of erythroblasts, with normal myelopoiesis and megakaryocytopoiesis, indicating pure red cell aplasia. Following the discontinuation of CBZ, she developed brisk reticulocytosis within 1 week and her hemoglobin level rose to a normal one within 1 month. Although the hematological toxicity of CBZ is well documented, isolated cessation of red cell production is uncommon. A patient who is undergoing treatment with CBZ should be carefully monitored, especially for serious adverse reactions including pure red cell aplasia.