Blood transfusions are frequently required for several weeks after allogeneic transplantation due to inadequate erythropoiesis and defective erythropoietin production. Because red cell transfusion is not without complications in this setting, we sought to avoid them using recombinant human erythropoietin (rhEpo) therapy. We treated 53 patients following allogeneic transplantation for haematological malignancy, using rhEpo at a dose of 10 000 units subcutaneously twice weekly. The median time of commencement of rhEpo was 61 days post-transplant (range 19-465 days), and the median haemoglobin (Hb) concentration was 9.4 g dL(-1) (range 7.0-10.7 g dL(-1)). Thirty patients responded to rhEpo and required no further transfusion with a median rise in Hb after 2 weeks of therapy of 1.5 g (0.7-4.1 g dL(-1)). Erythropoietin (Epo) was discontinued at a median of 5 weeks (range 2-36), when the median Hb concentration was 12.3 g dL(-1) (range 10.0-14.3 g dL(-1)). Those patients who failed to respond to rhEpo frequently had additional reasons for anaemia including cytomegalovirus (CMV) reactivation and treatment, major ABO incompatibility, disease relapse, graft rejection or other transplant-related complications. We conclude that a short course of rhEpo is an effective treatment for anaemia arising following allogeneic hematopoietic cell transplantation, and can avoid the need for transfusion in this setting.