Objective
Substance abuse intensive outpatient programs (IOPs) are direct services for people with substance use disorders or co-occurring mental and substance use disorders who do not require medical detoxification or 24-hour supervision. IOPs are alternatives to inpatient and residential treatment. They are designed to establish psychosocial supports and facilitate relapse management and coping strategies. This article assesses their evidence base.
Methods
Authors searched major databases: PubMed, PsycINFO, Applied Social Sciences Index and Abstracts, Sociological Abstracts, Social Services Abstracts, Published International Literature on Traumatic Stress, the Educational Resources Information Center, and the Cumulative Index to Nursing and Allied Health Literature. They identified 12 individual studies and one review published between 1995 and 2012. They chose from three levels of research evidence (high, moderate, and low) based on benchmarks for the number of studies and quality of their methodology. They also described the evidence of service effectiveness.
Results
Based on the quality of trials, diversity of settings, and consistency of outcomes, the level of evidence for IOP research was considered high. Multiple randomized trials and naturalistic analyses compared IOPs with inpatient or residential care; these types of services had comparable outcomes. All studies reported substantial reductions in alcohol and drug use between baseline and follow-up. However, substantial variability in the operationalization of IOPs and outcome measures was apparent.
Conclusions
IOPs are an important part of the continuum of care for alcohol and drug use disorders. They are as effective as inpatient treatment for most individuals seeking care. Public and commercial health plans should consider IOP treatment as a covered health benefit. Standardization of the elements included in IOPs may improve their quality and effectiveness.