The opioid crisis has become a significant international public health crisis fueled by complicated interactions between the medical profession, pharmaceutical marketing, regulatory failure, and socioeconomic vulnerability. This literature-based narrative review addresses the causes, effects, and response measures related to opioid misuse and opioid use disorder. Evidence demonstrates that increased opioid prescribing for the management of pain, manufacturing of drugs with heavy commercial promotion and inadequately established surveillance systems contributed to mass exposure and dependence. Subsequent transitions to heroin and extremely powerful synthetic opioid drugs compounded the overdose deaths and the burden on the health system. The review integrates the findings about major health consequences, such as overdose mortality, chronic medical complications, psychiatric disturbance, infectious disease transmission, and wider effects on society in particular families, communities, labor markets, and criminal justice systems. Policy and practice responses are reviewed on the areas of prescribing regulation, prescription monitoring, medication-assisted treatment, naloxone distribution, harm reduction services, and community-based interventions. The growing body of research regularly supports the use of multi-level, comprehensive frameworks involving prevention, treatment, harm reduction, and social support as opposed to isolated approaches. Effective long term response requires increasing access to successful evidence based treatment, building out public health infrastructure, stigma reduction and also addressing structural factors of risk. A guided and cohesive approach to opioid-related morbidity and mortality remains fundamental to decreasing opioid-related morbidity and mortality in a sustainable manner.

Keywords: Opioid crisis, Opioid use disorder, Overdose, Harm reduction, Medication-assisted treatment, Public health policy,

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