Prescription medications such as pain relievers, tranquilizers, stimulants, and sedatives are very useful treatment tools but sometimes people do not take them as directed and may become addicted. Pain relievers make surgery possible, and enable many individuals with chronic pain to lead productive lives. Most people who take prescription medications use them responsibly. However, the inappropriate or nonmedical use of prescription medications is a serious public health concern. Nonmedical use of prescription medications like opioids, central nervous system (CNS) depressants, and stimulants can lead to addiction, characterized by compulsive drug seeking and use.