Objectives:
The aim of the present study was to compare socio- demographic and clinical profile of the inpatients with dual diagnosis in Warsaw with the profile of inpatients treated in other European centres.

Methods:
50 patients consecutively admitted in Warsaw were included in the study; total number of patients included at all European sites was 352. Recruitment was conducted in general inpatient psychiatric departments and specialized dual diagnosis inpatient wards. Data was collected during single interview with the use of M.I.N.I and EuropAsi questionnaires.

Results:
Both in Warsaw and overall study population males constituted almost 2/3 of the group. Patients in Warsaw were more frequently living with relatives or other close persons as well as remained in intimate relationships, while compared to patients in other study sites. Depression was the most common diagnosis in Warsaw and it was significantly more often found at this site than in Tampere. Moreover, patients in Warsaw group were significantly less frequently diagnosed with cannabis use disorder and more frequently- with tranquillizers use disorder.

Conclusions:
Differences among sites regarding socio- demographic and clinical profiles of dual diagnosis patients were due both to socio- cultural factors (e.g. psychoactive substances accessibility) and research methodology.