Psychological interventions for co-occurring depression and substance use disorders

Area of Science:

• Psychiatry
• Clinical Psychology
• Addiction Medicine

Background:

• Comorbid depression and substance use disorders (SUDs) are prevalent and associated with poorer health outcomes.
• Effective treatments exist for individual disorders, but research on combined conditions is limited.

Purpose of the Study:

• To assess the efficacy of psychological interventions for individuals with comorbid depression and SUDs.
• To evaluate interventions delivered alone or combined with pharmacotherapy.

Main Methods:

• Systematic review of randomized controlled trials (RCTs) identified through extensive database searches.
• Inclusion criteria focused on RCTs using structured interviews for diagnosis and comparing psychological interventions (with or without pharmacotherapy) against control conditions.

Main Results:

• Seven RCTs (608 participants) met criteria, all from the USA with predominantly Caucasian samples.
• Two meta-analyses showed very low-quality evidence: Integrated Cognitive Behavioral Therapy (ICBT) vs. Twelve Step Facilitation (TSF) had mixed results on depression and substance use.
• Interpersonal Psychotherapy for Depression (IPT-D) showed short-term benefits for depression but not sustained, with no significant differences in substance use outcomes.

Conclusions:

• The review's conclusions are limited by the small number and very low quality of included studies.
• No definitive conclusions can be drawn regarding the efficacy of psychological interventions compared to no treatment or treatment as usual.
• Observed differences between psychotherapies were inconsistent, small, and of insufficient quality to inform clinical practice.