Psych CASC / OSCE · Foundations — neurotransmitters receptors signalling
Explaining how antidepressants work without the chemical-imbalance myth (CASC)
CASC-style station: accurate plain-language mechanism, delayed onset, side-effect expectations, serotonin toxicity risk with tramadol, and alcohol/GABA caution — without false slogans.
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Target exams
FRANZCPMRCPsychABPNMD-DNB
Prompt
A 34-year-old teacher starting sertraline asks: 'So I just have low serotonin and this tops it up like insulin for diabetes?' They also take tramadol for back pain and drink wine most nights.
Station instructions (candidate)
You have 7 minutes. Explain how sertraline is thought to help depression in accurate plain language, set expectations for time course and common side-effects, and address the tramadol and alcohol risks. Do not use a simplistic “low serotonin top-up” model as settled science. Anchor hope in treatment evidence while remaining scientifically honest.[1][3][5]
References5ShowHide
- [1]Stahl SM Mechanism of action of serotonin selective reuptake inhibitors. Serotonin receptors and pathways mediate therapeutic effects and side effects J Affect Disord, 1998.PMID 10333979
- [2]Hyman SE, Nestler EJ Initiation and adaptation: a paradigm for understanding psychotropic drug action Am J Psychiatry, 1996.PMID 8561194
- [3]Moncrieff J, Cooper RE, Stockmann T, et al. The serotonin theory of depression: a systematic umbrella review of the evidence Mol Psychiatry, 2023.PMID 35854107
- [4]Dunkley EJ, Isbister GK, Sibbritt D, et al. The Hunter Serotonin Toxicity Criteria: simple and accurate diagnostic decision rules for serotonin toxicity QJM, 2003.PMID 12925718
- [5]Cipriani A, Furukawa TA, Salanti G, et al. Comparative efficacy and acceptability of 21 antidepressant drugs for the acute treatment of adults with major depressive disorder: a systematic review and network meta-analysis Lancet, 2018.PMID 29477251