Recurrent Injecting Drug Use as a Mediator between Psychiatric Disorder and Non-Fatal Overdose

Area of Science:

• Public Health
• Psychiatry
• Epidemiology

Background:

• Unintentional drug overdose deaths have significantly increased in the U.S.
• Existing research indicates a correlation between psychiatric disorders and unintentional overdose.
• This study preliminarily tests a causal model where recurrent injection drug use mediates the relationship between psychiatric disorder and overdose.

Purpose of the Study:

• To examine if psychiatric disorder is associated with a higher prevalence of ever overdosing.
• To determine if recurrent injection drug use mediates the association between psychiatric disorder and overdose.
• To assess the statistical associations consistent with a causal model using cross-sectional data.

Main Methods:

• Cross-sectional study of 241 adults in New York City with potential substance use disorders.
• Employed conventional and Imai's mediation analyses.
• Statistical analysis adjusted for covariates to assess direct and indirect effects.

Main Results:

• 58% of participants had a prior psychiatric disorder diagnosis; 35.7% reported ever overdosing.
• Psychiatric diagnosis was associated with a 16% increased prevalence of ever overdosing.
• Recurrent injection drug use accounted for 42% of this association, acting as a significant mediator.

Conclusions:

• Findings support the need for longitudinal data to further assess the causal model.
• Interventions targeting psychiatric disorders may be a crucial strategy to reduce unintentional drug overdoses.
• This research provides a rationale for public health initiatives focused on mental health and substance use.