Rates and influences of alcohol use disorder comorbidity among primary stimulant misusing treatment-seekers: meta-analytic findings across eight NIDA CTN trials.

BACKGROUND: There is need to improve treatment effectiveness for stimulant misusers, and one means of doing so is by tailoring services to account for common diagnostic comorbidities and psychosocial challenges they face.
OBJECTIVES: Using its publicly available datasets, this CTN-approved secondary analysis project examined prevalence of alcohol use disorders (AUDs) among primary stimulant misusing treatment-seekers as well as impact of AUD comorbidity on their pre-treatment psychosocial functioning.
METHODS: Upon identifying a primary stimulant misuser subsample (N = 1133) from among aggregated treatment-seekers across eight CTN trials, diagnostic data were used to document lifetime AUD rates. Paired comparisons, stratified by stimulant drug type (e.g., amphetamine, cocaine) then tested the influence of AUD comorbidity on psychosocial indices from the Addiction Severity Index - Lite.
RESULTS: A high AUD rate (45%) was found in this client population. Among primary cocaine misusers, those with AUD were more likely to: (i) show elevated Addiction Severity Index composite scores, (ii) perceive greater importance of drug treatment, and (iii) endorse psychiatric symptoms and perceived need for their treatment. Among primary amphetamine misusers, those with AUD were more likely to endorse specific psychiatric symptoms.
CONCLUSION: Study findings document AUD comorbidity as a fairly common diagnostic feature of primary stimulant misusers, and suggest it is a pervasive influence on the pre-treatment psychosocial functioning of cocaine misusers. SCIENTIFIC SIGNIFICANCE: This study demonstrates the utility of CTN common assessment battery for secondary analysis projects, though challenges noted during its conduct highlight the value of consistent data collection and documentation within and across CTN trials.