There are several resources on opioid addiction beyond those mentioned in the other sections of the health policy research guide. Find some best bets below for researching that topic.
CDC Guidelines for Prescribing Opioids for Chronic Pain
Common Elements in Guidelines for Prescribing Opioids for Chronic Pain
HHS About the U.S. Opioid Epidemic
HHS Prevent Opioid Abuse and Addiction
National Institute on Drug Abuse
National Academies Pain Management & the Opioid Epidemic