[Quetiapine-induced leucopenia].

We describe the case of a 20-year-old man with schizophrenia who was treated with the dibenzothiazepine antipsychotic drug quetiapine in oral doses of 900 mg daily. At admission the patient had a normal blood count. 15 weeks after initiation of treatment asymptomatic cytopenia was discovered with leucocytes of 2.