Opioid use disorder is a medical condition characterized by the compulsive use of opioids, despite harmful consequences. This disorder can affect individuals who misuse prescription painkillers or illegal opioids such as heroin. Opioids are highly addictive substances that can lead to physical dependence and tolerance, making it difficult for individuals to stop using them without experiencing withdrawal symptoms. Research in the area of opioid use disorder focuses on understanding the underlying causes of addiction, developing effective treatments such as medication-assisted therapy, and addressing the public health impact of the opioid epidemic. Studies also explore the neurobiological mechanisms of addiction, risk factors for developing opioid use disorder, and strategies for preventing addiction and reducing harm associated with opioid use. Overall, research in this area aims to improve outcomes for individuals struggling with opioid use disorder and reduce the societal burden of opioid addiction.