Psych · Addiction psychiatry — substance use disorders
Opioid use disorder
Also known as OUD · Opioid dependence · Heroin dependence · Opioid addiction · Narcotic dependence · Opioid agonist treatment · Medication for opioid use disorder · Methadone maintenance · Buprenorphine treatment
Exam-exhaustive fellowship reference on opioid use disorder — DSM-5-TR/ICD-11 criteria; overdose and naloxone; COWS withdrawal; methadone and buprenorphine OAT doses and monitoring; naltrexone; harm reduction; pregnancy and dual pain pathways; landmark trials and regional guideline deltas. FRANZCP-primary, globally tagged.
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Target exams
Red flags
- Opioid overdose with respiratory depression — airway, ventilation, titrated naloxone; observe for re-sedation especially after long-acting opioids or fentanyl
- Methadone induction toxicity (often delayed days 3–7) — start low, go slow, daily review early on
- Precipitated withdrawal from premature buprenorphine or naltrexone — wait for objective withdrawal (COWS) before partial agonist/antagonist induction
- Loss of tolerance after detox, prison release, or missed OAT doses — high fatal overdose risk; restart carefully and supply take-home naloxone
- QTc prolongation / arrhythmia risk on methadone — baseline and indicated ECG, drug interaction review
- Pregnancy with OUD — do not force detox; prioritise OAT and obstetric-addiction liaison
Meet the patient
A 29-year-old man is found slumped in a fast-food toilet, respiratory rate 6, pinpoint pupils, cyanosed lips. Paramedics give intranasal naloxone; he wakes swearing and refuses to stay. Four hours later on the ward he is drowsy again.[10][12]
Two facts decide whether he lives this week. First, fentanyl outlasts naloxone — re-sedation is expected, never a surprise. Second, the most dangerous day of his life is the day he walks out after a detox, tolerance gone, buying the same bag.[4][13] This topic is the answer to "what do you do for him next" — beyond the naloxone.
Examiners punish three failures on OUD: thin nosology that muddles dependence with addiction, a loose grip on the overdose-and-withdrawal emergencies, and pharmacology with no agent, dose, route, monitoring or contraindication.[4][11][14]
References20ShowHide
- [1]Mattick RP, Breen C, Kimber J, Davoli M Methadone maintenance therapy versus no opioid replacement therapy for opioid dependence Cochrane Database Syst Rev, 2009.PMID 19588333
- [2]Mattick RP, Breen C, Kimber J, Davoli M Buprenorphine maintenance versus placebo or methadone maintenance for opioid dependence Cochrane Database Syst Rev, 2014.PMID 24500948
- [3]Wesson DR, Ling W The Clinical Opiate Withdrawal Scale (COWS) J Psychoactive Drugs, 2003.PMID 12924748
- [4]Sordo L, Barrio G, Bravo MJ, Indave BI, Degenhardt L, Wiessing L, et al. Mortality risk during and after opioid substitution treatment: systematic review and meta-analysis of cohort studies BMJ, 2017.PMID 28446428
- [5]Lee JD, Nunes EV, Novo P, Bachrach K, Bailey GL, Bhatt S, et al. Comparative effectiveness of extended-release naltrexone versus buprenorphine-naloxone for opioid relapse prevention (X:BOT): a multicentre, open-label, randomised controlled trial Lancet, 2018.PMID 29150198
- [6]D'Onofrio G, O'Connor PG, Pantalon MV, Chawarski MC, Busch SH, Owens PH, et al. Emergency department-initiated buprenorphine/naloxone treatment for opioid dependence: a randomized clinical trial JAMA, 2015.PMID 25919527
- [7]Jones HE, Kaltenbach K, Heil SH, Stine SM, Coyle MG, Arria AM, et al. Neonatal abstinence syndrome after methadone or buprenorphine exposure N Engl J Med, 2010.PMID 21142534
- [8]Fudala PJ, Bridge TP, Herbert S, Williford WO, Chiang CN, Jones K, et al. Office-based treatment of opiate addiction with a sublingual-tablet formulation of buprenorphine and naloxone N Engl J Med, 2003.PMID 12954743
- [9]Weiss RD, Potter JS, Fiellin DA, Byrne M, Connery HS, Dickinson W, et al. Adjunctive counseling during brief and extended buprenorphine-naloxone treatment for prescription opioid dependence: a 2-phase randomized controlled trial Arch Gen Psychiatry, 2011.PMID 22065255
- [10]Boyer EW Management of opioid analgesic overdose N Engl J Med, 2012.PMID 22784117
- [11]Volkow ND, Frieden TR, Hyde PS, Cha SS Medication-assisted therapies--tackling the opioid-overdose epidemic N Engl J Med, 2014.PMID 24758595
- [12]Strang J, Bird SM, Parmar MK Take-home emergency naloxone to prevent heroin overdose deaths after prison release: rationale and practicalities for the N-ALIVE randomized trial J Urban Health, 2013.PMID 23633090
- [13]Degenhardt L, Randall D, Hall W, Law M, Butler T, Burns L Mortality among clients of a state-wide opioid pharmacotherapy program over 20 years: risk factors and lives saved Drug Alcohol Depend, 2009.PMID 19608355
- [14]American Society of Addiction Medicine The ASAM National Practice Guideline for the Treatment of Opioid Use Disorder: 2020 Focused Update J Addict Med, 2020.PMID 32511106
- [15]Gowing L, Farrell M, Ali R, White JM Alpha₂-adrenergic agonists for the management of opioid withdrawal Cochrane Database Syst Rev, 2016.PMID 27140827
- [16]Minozzi S, Amato L, Jahanfar S, Bellisario C, Ferri M, Davoli M Maintenance agonist treatments for opiate-dependent pregnant women Cochrane Database Syst Rev, 2020.PMID 33165953
- [17]Larochelle MR, Bernson D, Land T, Stopka TJ, Wang N, Xuan Z, et al. Medication for Opioid Use Disorder After Nonfatal Opioid Overdose and Association With Mortality: A Cohort Study Ann Intern Med, 2018.PMID 29913516
- [18]Krantz MJ, Martin J, Stimmel B, Mehta D, Haigney MC QTc interval screening in methadone treatment Ann Intern Med, 2009.PMID 19153406
- [19]Nielsen S, Larance B, Degenhardt L, Gowing L, Kehler C, Lintzeris N Opioid agonist treatment for pharmaceutical opioid dependent people Cochrane Database Syst Rev, 2016.PMID 27157143
- [20]Degenhardt L, Grebely J, Stone J, Hickman M, Vickerman P, Marshall BDL, et al. Global patterns of opioid use and dependence: harms to populations, interventions, and future action Lancet, 2019.PMID 31657732