The authors examined treatment patterns for two groups of dually diagn
osed psychiatric inpatients, those with a) co-occurring, but independe
nt mental and substance use disorders (IMD + PSUD); and b) substance-i
nduced organic mental disorders (PSUD-OMD). Assessments included the A
ddiction Severity? Index for perceived service needs, discharge record
s for recommended treatments, and the Quality of Life Interview for fo
llow-up treatment utilization. As expected, the groups differed on tre
atment patterns. Both received fewer services than needed during the 1
-year follow-up. In particular, the IMD + PSUD patients utilized few s
ubstance abuse services and the PSUD-OMD utilized few psychiatric serv
ices.