We studied 90 opioid-dependent subjects, 38 with one or more additional Axis I diagnosis and 52 with no psychiatric comorbidity. There were significant differences between these two groups regarding the methadone dose required for clinical stabilization, but not in the rate of retention in treatment. Dual Diagnosis patients, those with psychiatric comorbidity, required an average stabilization dose of 154 +/- 84 of methadone compared to 99 +/- 49 mg/day for patients whose only Axis I diagnosis was Opioid Dependence. In the 990-day period considered there were no differences between the two groups of patients in terms of retention in treatment.

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