The study identifies effective, lifesaving interventions following initial nonfatal overdoses. The odds of dying from a subsequent lethal overdose decreased among cohort members who received methadone (58% lower odds), buprenorphine (52% lower odds), or behavioral health assessment or crisis services (75% lower odds). The risk of overdose mortality among those who filled a prescription for naloxone was also reduced by 30%. However, significant gaps in care were also noted.