A case of immune complex hemolytic anemia, thrombocytopenia, and acute renal failure associated with doxepin use

A 46-year-old man suffering from neurotic depression complicated by alcohol and benzodiazepine dependence developed Coombs'-positive hemolytic anemia and thrombocytopenia with acute renal failure after 5 weeks of monotherapy with doxepin at a final dosage of 100 mg daily. The patient recovered completely after discontinuation of doxepin, blood exchange transfusion, and repeated hemodialyses. He had no history of hematologic abnormalities, exposure to other toxins, or glucose-6-phosphate dehydrogenase deficiency. Because other etiologic factors were ruled out, the short interval between the onset of the patient's hemolytic crisis and the administration of doxepin highly suggests that doxepin was associated with the complication. To the best of our knowledge, ours is the first report of this adverse effect following doxepin administration.