This study examines the ability to acknowledge the need for treatment of me
ntal illness and substance abuse problems among dually-diagnosed inpatients
before and after an inpatient substance abuse treatment program. A cohort
of 264 consecutively admitted patients diagnosed with a mental illness and
substance use disorder were entered into a dual diagnosis treatment program
. Perceptions of patients diagnosed with a substance-induced mental disorde
r were compared to those of patients with a primary mental illness regardin
g their problems and need for treatment before and after the dual diagnosis
program. Most patients acknowledged a substance abuse or mental illness pr
oblem and need for treatment. Patients with substance-induced mental disord
ers were more likely to acknowledge a substance use problem and need for tr
eatment (p<.001). After treatment, changes in perception of mental illness
were greater for substance-induced mental disorder patients compared to pat
ients with a primary mental illness (p<.001). Persons with more severe subs
tance abuse were more likely to acknowledge a problem and need for treatmen
t. The majority of dually-diagnosed patients admitted with a substance use
disorder agreed that substance use was a problem, suggesting that inpatient
hospitalization presents a prime opportunity to address addiction in duall
y-diagnosed patients. The type of mental illness and severity of substance
use influenced perceptions of illnesses and treatment readiness and must be
considered by the clinician.