Characteristics of post-overdose outreach programs and municipal-level opioid overdose in Massachusetts.

Background: Post-overdose outreach programs have proliferated in response to opioid overdose. Implementing these programs is associated with reductions in overdose rates, but the role of specific program characteristics in overdose trends has not been evaluated.

Methods: Among 58 Massachusetts municipalities with post-overdose outreach programs, we examined associations between five domains of post-overdose outreach program characteristics (outreach contact rate, naloxone distribution, coercive practices, harm reduction activities, and social service provision or referral) and rates of fatal opioid overdoses and opioid-related emergency medical system responses (i.e., ambulance activations) per calendar quarter from 2013 to 2019 using segmented regression analyses with adjustment for municipal covariates and fixed effects. For both outcomes, each domain was modeled: a) individually, b) with other characteristics, and c) with other characteristics and municipal-level fixed effects.

Results: There were no significant associations (p < 0.05) between outreach contact rate, naloxone distribution, coercive practices, or harm reduction activities with municipal fatal overdose trends. Municipalities with programs providing or referring to more social services experienced 21% fewer fatal overdoses compared to programs providing or referring to more social services (Rate Ratio (RR) 0.79, 95% Confidence Interval (CI) 0.66-0.93, p = 0.01). Compared to municipalities in quarters when programs had no outreach contacts, municipalities with some, but less than the median outreach contacts, experienced 14% lower opioid-related emergency responses (RR 0.86, 95% CI 0.78-0.96, p = 0.01). Associations between naloxone distribution, coercive practices, harm reduction practices, or social services and opioid-related emergency responses were not consistently significant across modeling approaches.

Conclusion: Municipalities with post-overdose outreach programs providing or referring to more social services had lower fatal opioid overdose rates. Municipalities in quarters when programs outreached to overdose survivors had fewer opioid-related emergency responses, but only among programs with below the median number of outreach contacts. Social service linkage should be core to post-overdose programs. Evaluations should assess program characteristics to optimize program design.