Overdose Prevention Initiative (OPI) scientists collect and analyze data on fatal drug-related overdoses, fatal drug-related overdose risk factors, non-fatal drug-related overdoses, opioid prescriptions, and substance use and misuse behaviors. OPI shares data via a dashboard, data briefs and manuscripts. The links below are OPI's most recent data products.
For questions, please contact us at opi@cdph.ca.gov.
Sex-Based Patterns in Nonfatal Drug Overdose Emergency Department Visits in California (2018-2023): Unintentional Overdose and Intentional Self-Harm (PDF)
Drug-Related Overdose Deaths among Veterans in California, 2022–23 (PDF)
Opioid-Related Overdose Deaths in California, 2023 (PDF)
Synthetic Opioid Death Data Snapshot (PDF)
California State Unintentional Drug Overdose Reporting System (SUDORS) 2022 Overview Data Brief (PDF, 2.3MB)
California emergency department (ED) visits fell sharply at the onset of COVID-19, but drug-related ED visits stayed steady (PDF)
Sociodemographic and geographic disparities in excess fatal drug overdoses during the COVID-19 pandemic in California
Opioid-Related Overdose Deaths in California, 2022 (PDF)
Synthetic Opioid-Related Overdose Deaths Increased at an Unpredictable Pace in 2020 (PDF)
October 2024 - September 2025 (PDF)
Prevalence and Trends in Self-Reported Drug Use in California, 2017–21: Data from the California Health Interview Survey (CHIS) (PDF)
Adult Prescription Painkiller Misuse in California, 2017–19 (PDF)
Impacts of prescription drug monitoring program policy changes and county opioid safety coalitions on prescribing and overdose outcomes in California, 2015–18
California State Unintentional Drug Overdose Reporting System (SUDORS) 2019 Overview Data Brief (PDF, 1.4MB)
Opioid-Related Overdose Deaths in California, 2021 (PDF)
California State Unintentional Drug Overdose Reporting System (SUDORS) 2020 Overview Data Brief (PDF, 2.3MB)