Naltrexone in Borderline Personality Disorder

Inclusion Criteria: * In- and Outpatients:Borderline personality disorder according to the Diagnostic and Statistical Manual for Mental Disorders, 4.Edition (DSM IV) * DES-(Dissociative Experience Scale)-score: \> or equal 18 according to amendment4 (former value according to amendment 2 was \> or equal 25). * Urinary test of opiates negative * No psychopharmacological treatment for two weeks prior to study (fluoxetine four weeks) * No Lithium for two months Exclusion Criteria: * Lifetime diagnosis of psychotic disorder * Current major depressive disorder (MDD) * Lifetime diagnosis opioid dependence or current opioid abuse (10 to 7 days prior to study) * Comedication with opioid analgetics * Known naltrexone intolerance * Liver disease * Pregnancy and lactation period * Other severe medical or neurological diseases * Simultaneous participation in another study