Opioids are a class of drugs that include both prescription medications, like oxycodone, hydrocodone, morphine, and fentanyl, as well as illegal drugs, such as heroin. These substances work by binding to opioid receptors in the brain and body to reduce pain and create feelings of relaxation and euphoria. While they are often prescribed for pain management, opioids carry a high risk of dependency and addiction due to their powerful effects on the brain’s reward system. Misuse or long-term use of opioids can lead to tolerance, physical dependence, and withdrawal symptoms, making it essential to use them carefully under medical supervision.