Psych CASC / OSCE · Addiction psychiatry — substance use disorders
Explain methadone, buprenorphine, COWS, and naloxone — CASC communication station
MRCPsych/FRANZCP-style communication station: explain withdrawal staging, OAT rationale, precipitated withdrawal timing, methadone vs buprenorphine, and naloxone training against unsafe detox pressure.
On this page & tools
Target exams
Station brief
Format. Communication station, approximately 7–10 minutes after reading. You are the psychiatry/addiction registrar. Examiner may play patient and/or sister. [3]
Candidate instructions. Explain opioid withdrawal and why medication treatment is recommended after overdose. Describe COWS in plain language. Compare methadone and buprenorphine. Explain why buprenorphine is started when already withdrawing. Teach take-home naloxone. Negotiate against unsafe rapid home detox. Check understanding. [1][3][4]
Candidate scenario
Severe OUD, yesterday’s overdose, now COWS 14 (moderate). You propose buprenorphine–naloxone induction today with clinic follow-up and take-home naloxone. Sister insists willpower detox is safer than “more opioids.” [1][5]
Marking domains
- Empathy, structure, non-stigmatising language
- Plain-language model of withdrawal vs chronic OUD
- COWS timing and precipitated withdrawal explained simply
- Methadone vs buprenorphine differences at lay level
- Naloxone education (slow breathing, call emergency services)
- Mortality/retention rationale against detox-only pressure
- Teach-back / shared plan [2][3]
Reveal assessor key
Open. Name time; ask top fears (control, stigma, “liquid handcuffs,” baby/family concerns if raised). [3]
Explain withdrawal. “Your body has adapted to opioids. When they drop, you get flu-like sickness, craving, and restlessness. We score this with a checklist called COWS — your score shows moderate withdrawal, which is actually the right window to start buprenorphine safely.” [5]
Explain OAT. “Medicines like buprenorphine or methadone stabilise receptors, cut craving and street use, and people who stay on treatment are less likely to die than people who stop treatment.” Keep statistics light but accurate.[2][3]
Buprenorphine plan. “We start with a small under-the-tongue dose (about 2–4 mg), check how you feel in an hour or two, and build up — often toward about 8 mg on day one if you tolerate it, then a daily dose that stops withdrawal and craving (often 8–24 mg). We wait until you are already withdrawing so the medicine does not knock other opioids off the receptor too fast.” Link to clinic.[1][3]
Methadone contrast. Full agonist, daily supervised dosing early, very effective, needs careful slow start because it builds up; heart-rhythm checks in some people. Can revisit choice later. [3]
Naloxone. Train both on recognising slow breathing and using take-home naloxone; always call emergency services. [4]
Sister’s detox plan. Acknowledge love and fear; explain high relapse and overdose risk when tolerance falls after detox without treatment. Offer support without colluding in unsafe care. [2]
Close. Summarise plan, written info, crisis contacts, early review, teach-back. [3]
References
- [1]D'Onofrio G, O'Connor PG, Pantalon MV, et al. Emergency department-initiated buprenorphine/naloxone treatment for opioid dependence: a randomized clinical trial JAMA, 2015.PMID 25919527
- [2]Sordo L, Barrio G, Bravo MJ, et al. Mortality risk during and after opioid substitution treatment BMJ, 2017.PMID 28446428
- [3]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
- [4]Boyer EW Management of opioid analgesic overdose N Engl J Med, 2012.PMID 22784117
- [5]Wesson DR, Ling W The Clinical Opiate Withdrawal Scale (COWS) J Psychoactive Drugs, 2003.PMID 12924748