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Psych TopicsPsychopharmacology — anxiolytics and hypnotics

Psych · Psychopharmacology — anxiolytics and hypnotics

Anxiolytics and hypnotics

Also known as Benzodiazepines · Z-drugs · Sedative-hypnotics · Buspirone · Pregabalin anxiety · Hydroxyzine · Melatonin · Hypnotics · Anxiolytic pharmacology

Exam-exhaustive fellowship psychopharmacology of anxiolytics and hypnotics — benzodiazepines and Z-drugs (GABA-A PAM, half-life maps, short-term use only), buspirone, pregabalin, hydroxyzine, melatonin; dependence risk, structured taper principles, elderly falls and Beers criteria, opioid/alcohol interactions, guideline deltas (BAP, WFSBP, AASM, Canadian BRZA, EMPOWER). FRANZCP-primary, globally tagged.

medium28 referencesUpdated 26 July 202613 min readVerification in progress

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FRANZCPMRCPsychABPNMD-DNBNEET-SS

Red flags

  • Abrupt cessation after continuous benzodiazepine or Z-drug use — seizure, delirium, and severe rebound risk; reinstate cover then controlled taper
  • Concurrent benzodiazepines with opioids or heavy alcohol — synergistic CNS and respiratory depression and overdose death risk
  • Routine long-term benzodiazepine or Z-drug renewals for primary insomnia or GAD without exit plan — dependence and elderly harm
  • Flumazenil as default in chronic users or mixed overdose — can precipitate seizures; highly selected use only
  • Assuming Z-drugs are non-dependence-forming safe long-term hypnotics in older adults
  • Using buspirone to cover benzodiazepine withdrawal — no GABA-A PAM activity
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Your progress

Saved on this device.

Practise this topic10 MCQs with explanations

Target exams

FRANZCPMRCPsychABPNMD-DNBNEET-SS

Red flags

  • Abrupt cessation after continuous benzodiazepine or Z-drug use — seizure, delirium, and severe rebound risk; reinstate cover then controlled taper
  • Concurrent benzodiazepines with opioids or heavy alcohol — synergistic CNS and respiratory depression and overdose death risk
  • Routine long-term benzodiazepine or Z-drug renewals for primary insomnia or GAD without exit plan — dependence and elderly harm
  • Flumazenil as default in chronic users or mixed overdose — can precipitate seizures; highly selected use only
  • Assuming Z-drugs are non-dependence-forming safe long-term hypnotics in older adults
  • Using buspirone to cover benzodiazepine withdrawal — no GABA-A PAM activity
The one-line answer

Anxiolytics and hypnotics split into two mechanisms that modulate GABA-A and four that do not: benzodiazepines and Z-drugs (short-term only for primary anxiety or insomnia, with real dependence and elderly-fall risk), plus buspirone, pregabalin, hydroxyzine and melatonin. Examiners test mechanism literacy, duration limits, taper craft, and the lethal interactions with opioids and alcohol.[1][13][25]

Meet the patient

A 41-year-old man with generalised anxiety disorder has been taking zopiclone nightly for three years on repeat telehealth scripts, with alprazolam "for the bad days". He wants the dose increased because neither works the way it used to.[1][3][28]

His partner mentions, almost apologetically, that twice he has got up in the night, eaten in the kitchen and remembered none of it. He drives to work at 6am.[28][7]

Three examiner questions are already live: which receptor is each of those tablets actually hitting?, why has tolerance outrun the anxiolysis?, and what treats his anxiety when the GABAergic bridge comes down? The rest of this topic answers them.[1][13][22]

Fellowship language here is concrete: half-life maps, agent-level doses, written exit plans, Beers-listed elderly harm, and knowing when not to reach for alprazolam. Long-term anxiety control is SSRI/SNRI plus psychological therapy; GABAergic drugs are bridges, crisis tools or specialised exceptions — never lifestyle maintenance.[13][14][5]

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References28ShowHide
  1. [1]Soyka M Treatment of Benzodiazepine Dependence N Engl J Med, 2017.PMID 28328330
  2. [2]Brett J, Murnion B Management of benzodiazepine misuse and dependence Aust Prescr, 2015.PMID 26648651
  3. [3]Ashton H The diagnosis and management of benzodiazepine dependence Curr Opin Psychiatry, 2005.PMID 16639148
  4. [4]Voshaar RC, Couvée JE, van Balkom AJ, et al. Strategies for discontinuing long-term benzodiazepine use: meta-analysis Br J Psychiatry, 2006.PMID 16946355
  5. [5]Lader M Benzodiazepine harm: how can it be reduced? Br J Clin Pharmacol, 2014.PMID 22882333
  6. [6]Markota M, Rummans TA, Bostwick JM, et al. Benzodiazepine Use in Older Adults: Dangers, Management, and Alternative Therapies Mayo Clin Proc, 2016.PMID 27814838
  7. [7]Glass J, Lanctôt KL, Herrmann N, et al. Sedative hypnotics in older people with insomnia: meta-analysis of risks and benefits BMJ, 2005.PMID 16284208
  8. [8]Tannenbaum C, Martin P, Tamblyn R, et al. Reduction of inappropriate benzodiazepine prescriptions among older adults through direct patient education: the EMPOWER cluster randomized trial JAMA Intern Med, 2014.PMID 24733354
  9. [9]Pottie K, Thompson W, Davies S, et al. Deprescribing benzodiazepine receptor agonists: Evidence-based clinical practice guideline Can Fam Physician, 2018.PMID 29760253
  10. [10]Darker CD, Sweeney BP, Barry JM, et al. Psychosocial interventions for benzodiazepine harmful use, abuse or dependence Cochrane Database Syst Rev, 2015.PMID 26106751
  11. [11]Baandrup L, Ebdrup BH, Rasmussen JØ, et al. Pharmacological interventions for benzodiazepine discontinuation in chronic benzodiazepine users Cochrane Database Syst Rev, 2018.PMID 29543325
  12. [12]Lader M, Kyriacou A Withdrawing Benzodiazepines in Patients With Anxiety Disorders Curr Psychiatry Rep, 2016.PMID 26733324
  13. [13]Baldwin DS, Anderson IM, Nutt DJ, et al. Evidence-based pharmacological treatment of anxiety disorders, post-traumatic stress disorder and obsessive-compulsive disorder: a revision of the 2005 guidelines from the British Association for Psychopharmacology J Psychopharmacol, 2014.PMID 24713617
  14. [14]Bandelow B, Allgulander C, Baldwin DS, et al. World Federation of Societies of Biological Psychiatry (WFSBP) guidelines for treatment of anxiety, obsessive-compulsive and posttraumatic stress disorders - Version 3. Part I: Anxiety disorders World J Biol Psychiatry, 2023.PMID 35900217
  15. [15]Sateia MJ, Buysse DJ, Krystal AD, et al. Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults: An American Academy of Sleep Medicine Clinical Practice Guideline J Clin Sleep Med, 2017.PMID 27998379
  16. [16]Wilson S, Anderson K, Baldwin D, et al. British Association for Psychopharmacology consensus statement on evidence-based treatment of insomnia, parasomnias and circadian rhythm disorders: An update J Psychopharmacol, 2019.PMID 31271339
  17. [17]Pande AC, Crockatt JG, Feltner DE, et al. Pregabalin in generalized anxiety disorder: a placebo-controlled trial Am J Psychiatry, 2003.PMID 12611835
  18. [18]Feltner DE, Crockatt JG, Dubovsky SJ, et al. A randomized, double-blind, placebo-controlled, fixed-dose, multicenter study of pregabalin in patients with generalized anxiety disorder J Clin Psychopharmacol, 2003.PMID 12826986
  19. [19]Rickels K, Pollack MH, Feltner DE, et al. Pregabalin for treatment of generalized anxiety disorder: a 4-week, multicenter, double-blind, placebo-controlled trial of pregabalin and alprazolam Arch Gen Psychiatry, 2005.PMID 16143734
  20. [20]Llorca PM, Spadone C, Sol O, et al. Efficacy and safety of hydroxyzine in the treatment of generalized anxiety disorder: a 3-month double-blind study J Clin Psychiatry, 2002.PMID 12444816
  21. [21]Guaiana G, Barbui C, Cipriani A Hydroxyzine for generalised anxiety disorder Cochrane Database Syst Rev, 2010.PMID 21154375
  22. [22]Chessick CA, Allen MH, Thase M, et al. Azapirones for generalized anxiety disorder Cochrane Database Syst Rev, 2006.PMID 16856115
  23. [23]Ferracioli-Oda E, Qawasmi A, Bloch MH Meta-analysis: melatonin for the treatment of primary sleep disorders PLoS One, 2013.PMID 23691095
  24. [24]Brzezinski A, Vangel MG, Wurtman RJ, et al. Effects of exogenous melatonin on sleep: a meta-analysis Sleep Med Rev, 2005.PMID 15649737
  25. [25]Sun EC, Dixit A, Humphreys K, et al. Association between concurrent use of prescription opioids and benzodiazepines and overdose: retrospective analysis BMJ, 2017.PMID 28292769
  26. [26]Olfson M, King M, Schoenbaum M Benzodiazepine use in the United States JAMA Psychiatry, 2015.PMID 25517224
  27. [27]By the 2023 American Geriatrics Society Beers Criteria Update Expert Panel American Geriatrics Society 2023 updated AGS Beers Criteria for potentially inappropriate medication use in older adults J Am Geriatr Soc, 2023.PMID 37139824
  28. [28]Gunja N The clinical and forensic toxicology of Z-drugs J Med Toxicol, 2013.PMID 23404347

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