This document discusses substance abuse, specifically related to opioids. It defines addiction and intoxication, provides a brief history of opioid use dating back to 3000 BC, and outlines the typical pathways that lead to opioid addiction. It also includes statistics on prescription drug abuse and lists common opioid substances. The effects of opioids are described relating to the central nervous system, eyes, and gastrointestinal tract. Signs of opioid intoxication, withdrawal, and addiction are outlined. Nursing diagnoses for those with substance abuse issues are risk for injury, ineffective denial, and ineffective coping.