Opioid analgesics are a class of medications that are used to alleviate pain. They work by binding to opioid receptors in the brain, which can produce a sense of euphoria and relieve discomfort. There are many different types of opioid analgesics, including morphine, fentanyl, oxycodone, and hydrocodone. These medications are commonly used to treat acute and chronic pain, as well as to manage pain in individuals with cancer or other serious illnesses. However, due to their potential for abuse and addiction, opioid analgesics should be used with caution and only under the supervision of a qualified medical professional. Other synonyms for opioid analgesics include narcotics, painkillers, and opiates.