Past studies examining the prevalence of psychiatric disorders among migrants have described a higher rate of schizophrenia, whereas the only major German study found a lower rate. Considering the changed composition of migrants today, a new assessment has become necessary. All admission records of migrants to a psychiatric clinic in 1993 and 1994 were assessed for diagnosis, symptomatology and treatment. Two hundred sixty-three migrant admissions, 8.4% of total admissions, were assessed. Of these 41.4% received a diagnosis of a schizophrenic disorder, significantly more than other clinic patients. The mean age at admission was 33.8 years, at onset of illness 28.6 years and at time of migration 20.3 years. Only 7.9% were mentally ill at the time of migration. Of those with psychotic and depressive symptoms at admission, 70% received a diagnosis of a schizophrenic disorder and 78% were treated with antipsychotics. Antidepressants were prescribed only to 47% of those with a diagnosis of a depressive disorder and only 33% of those with depressive and no psychotic symptoms. An underrepresentation of migrants shows differences in the use of psychiatric services. The higher rate of schizophrenia may be due to misdiagnosis, an artifactual effect of underrepresentation of other disorders or an actual higher rate among migrants. The reluctance to use antidepressants underlines the necessity of training, so as not to withhold treatment options due to cultural barriers.