Opiates are a class of drugs derived from the opium poppy, primarily including morphine and codeine, that act on opioid receptors in the central nervous system to produce analgesia, sedation, and euphoria. They are crucial in managing acute and chronic pain but carry a significant risk of addiction, respiratory depression, and overdose. Clinicians must balance effective pain relief with the potential for misuse, particularly in patients with a history of substance use disorders.