Addiction Medicine: Opioid Use Disorder.

Most overdose deaths in the United States involve opioids. Identification and management of opioid use disorder by primary care physicians is a critical need in health care. Substance use disorders share neurobiological dysregulation of the central motivation and reward pathway (powered by dopamine) that manifests as a cycle of addiction driven by impulse and compulsion. It is important that concern for opioid use disorder does not disrupt appropriate treatment of pain and that analgesic narcotic use is adequately monitored, especially in patients at risk of opioid use disorder. Most patients with opioid use disorder do not receive treatment. Those who do receive treatment will experience uncomfortable, but not life-threatening, symptoms of withdrawal. These symptoms can be managed with alpha2-adrenergic and opioid agonists that also reduce the reinforcement of drug use and help prolong recovery. The 2023 Mainstreaming Addiction Treatment Act removed the waiver requirement for buprenorphine prescribing, which closes the substantial gap in access to medication for opioid use disorder existing across gender, racial, and socioeconomic groups. Treatment plans that include medication for opioid use disorder have been shown to substantially reduce mortality.