World Health Organization, opioids overdose information, management of substance abuse

Addressing the opioid crisis globally,” World Psychiatry, 2019

U.S. Centers for Disease Control and Prevention, opioid overdose information for patients, doctors, health care providers and public officials

U.S. Centers for Disease Control and Prevention, data page, including state-level numbers on deaths and other trends from prescription drugs, heroin and non-pharmaceutical fentanyl

Physicians for Responsible Opioid Prescribing