The present study was undertaken to explore the treatment history of women with borderline personality disorder and to provide an estimation of the treatment costs. Using a semi-structured interview, forty-five carefully diagnosed patients were interrogated about their lifetime treatment history with respect to every inpatient and outpatient treatment received for any psychical symptoms, including physical treatment after self-injurious behaviour. Results demonstrate an extensive and protracted use of psychiatric, psychotherapeutic and physical help, and a chaotic course of treatment with discontinuance of treatments as a characteristic feature. Treatment costs were estimated at a minimum of 24,000 DM per year and patient; 22,000 DM due to hospitalisations. The unsatisfactory treatment situation for these patients in the public health system and the socioeconomic advantages of a specified treatment programme are discussed.