The addictive process of opioids: current and novel interventions in opioid use disorder

The growing epidemic of opioid misuse presents numerous challenges for healthcare practitioners and patients alike as friction exists between ease of use and efficacy, and potential for overuse and addiction. With over 82 000 deaths related to opioid overdose in North America in 2020, it is imperative to gain a better understanding of the underlying mechanisms behind the addiction process, as well as the current methods being used in the arsenal against this disease. The current best pharmacological approaches for mediating opioid use disorder are methadone, buprenorphine, naltrexone, and naloxone, which act on opioid receptors to produce diverse effects based upon the patients' needs. The variety of effects that these drugs produce, which include removing opioid withdrawal, reversing overdose effects, and blocking opioid properties, makes this arsenal of therapeutics a global necessity in addressing the opioid use epidemic. Accordingly, this narrative review provides a summary of the available data regarding the physiological processes by which opioid addiction takes place and discusses the current and future potential of interventional methods used to mitigate opioid use disorder. The mechanisms of action and subsequent functional outcomes must be understood to reduce the number of opioid-related deaths worldwide.