An opioid is a type of drug that acts on the nervous system to relieve pain. They can be natural, like those derived from the opium poppy, or synthetic, created in laboratories. Opioids work by binding to specific receptors in the brain and body, reducing the perception of pain and producing feelings of euphoria. While opioids can be effective for managing severe pain, they also carry a risk of addiction and overdose. Common prescription opioids include morphine, oxycodone, and hydrocodone. Due to their potential for misuse, healthcare providers often monitor their use closely.