The DOI matches its Crossref record; 72 of the 74 references it cites were found in a registry or an index.
Abuse and dependence potential for the non-benzodiazepine hypnotics zolpidem and zopiclone: a review of case reports and epidemiological data
Abstract
AIMS: The non-benzodiazepine hypnotics zolpidem and zopiclone, which are indicated for short-term treatment of insomnia, were considered originally by physicians as almost devoid of abuse and dependence potential. Several recent publications, however, have suggested that both agents carry a significant risk of abuse. To substantiate and re-evaluate this situation, the world literature was reviewed for cases of dependence of both agents; these cases were analysed in order to identify certain underlying patterns, if evident. METHODS: A systematic review based on a Medline literature search was conducted including the years 1966-2002 to assemble all available clinical case reports that were analysed for typical features of abuse and dependence according to prespecified criteria. Only case reports were of interest, and clinical studies were excluded. No limitations as to language or publication year were applied. The terms 'zolpidem', 'zopiclone' and 'abuse', 'dependence', 'addiction', 'withdrawal' and 'intoxication' were used to identify relevant publications. Potentially relevant citations were retrieved and assessed for inclusion independently by two authors. RESULTS: A total of 36 cases for zolpidem were identified, most of them reported in recent years, and 22 cases for zopiclone. Both sexes were involved to a similar extent; and cases were reported in all age groups. In extreme cases, dose increases reached a factor of 30-120 above the recommended doses. The majority of patients had a history of former drug or alcohol abuse and/or other psychiatric conditions. CONCLUSION: On the basis of world-wide prescription numbers, which are approximately twofold higher for zolpidem (1,338,774,000 tablets from June 2001 to June 2002 in Europe, Japan and United States) than for zopiclone (664,897,000 tablets during the same period in Europe and Japan), the relative incidence of reported dependence similar for both drugs and remarkably lower than that of benzodiazepines used for the treatment of disturbed sleep. The findings offer the conclusion that zolpidem and zopiclone are relatively safe drugs. However, as both drugs are psychotropic drugs, patients with a history of abuse or dependence and those with psychiatric diseases seem to be at increased risk of abuse of these agents.
Overview
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
In the citing paper
“Evidence 9 28 suggests that zopiclone carries a potential for dependence.”
From Z-drug abuse and dependence: Clinical guideline of the Brazilian Academy of Neurology for diagnosis and management (2025) · cites this paper as [28]
In the citing paper
“This elevated risk among older adults is partly attributed to the higher prevalence of sleep and mood disorders in this population, as well as to age-related reductions in drug clearance.”
From Z-drug abuse and dependence: Clinical guideline of the Brazilian Academy of Neurology for diagnosis and management (2025) · cites this paper as [28]
In the citing paper
“Studies 28 have shown that a history of psychiatric illness, as well as concurrent use of alcohol or other substances, significantly increases the risk of Z-drug misuse.”
From Z-drug abuse and dependence: Clinical guideline of the Brazilian Academy of Neurology for diagnosis and management (2025) · cites this paper as [28]
In the citing paper
“Psychiatric comorbidities are common among individuals with Z-drug use disorder, particularly depressive, anxiety, and personality disorders.”
From Z-drug abuse and dependence: Clinical guideline of the Brazilian Academy of Neurology for diagnosis and management (2025) · cites this paper as [28]
In the citing paper
“In addition to their therapeutic potential, these medications also have reinforcing properties (1–3) and thus can be misused”
From Prevalence and correlates of the misuse of z-drugs and benzodiazepines in the National Survey on Drug Use and Health (2023) · cites this paper as [1]
Citations
Cites
Systematic Reviews: Identifying relevant studies for systematic reviews
Dickersin, K., Scherer, R. W., & Lefebvre, C. (1994) · BMJ · doi:10.1136/bmj.309.6964.1286 · Cited by 2,255
Ward, A., & Clissold, S. P. (1987) · Drugs · doi:10.2165/00003495-198734010-00003 · Cited by 1,761
Siegel, R. S., & WEIDEN, I. (1968) · The Journal of Trauma: Injury, Infection, and Critical Care · doi:10.1097/00005373-196811000-00016 · Cited by 671
Holm, K. J., & Goa, K. L. (2000) · Drugs · doi:10.2165/00003495-200059040-00014 · Cited by 317
A prospective study of mortality among drug misusers during a 4‐year period after seeking treatment
Gossop, M., Stewart, D., Treacy, S., & Marsden, J. (2002) · Addiction · doi:10.1046/j.1360-0443.2002.00079.x · Cited by 311
Addiction: Part I. Benzodiazepines--side effects, abuse risk and alternatives.
Longo, L. P., & Johnson, B. (2000) · PubMed · Cited by 302
Behavioral Pharmacology of Zolpidem Relative to Benzodiazepines A Review
Rush, C. R. (1998) · Pharmacology Biochemistry and Behavior · doi:10.1016/s0091-3057(98)00102-6 · Cited by 260
Epidemiological Evidence for a Low Abuse Potential of Zolpidem
Soyka, M., Bottlender, R., & Möller, H.-J. (2000) · Pharmacopsychiatry · doi:10.1055/s-2000-11224 · Cited by 249
Use and Abuse of the Benzodiazepines
Fraser, A. D. (1998) · Therapeutic Drug Monitoring · doi:10.1097/00007691-199810000-00007 · Cited by 243
Limitations on the use of benzodiazepines in anxiety and insomnia: are they justified?
LADER, M. H. (1999) · European Neuropsychopharmacology · doi:10.1016/s0924-977x(99)00051-6 · Cited by 218
Research works printed but not linked: 10
- Alvarez M. D., 1994, Zopiclona: estudio de postcomercializacion en Espana [Zopiclone: postmarketing study in Spain], Psiquis, 15, 17
- Arzneimittelkommission der deutschen Ärzteschaft, 1999, Keine Verordnung von Zolpidem bei bekannter Benzodiazepinabhängigkeit [No prescription of zolpidem in known benzodiazepine dependence], Deutsches Ärzteblatt, 96, B
- Chamorro‐Garcia L., 1996, Depencia de zolpidem [Zolpidem dependence], Medicina Clinica, 106, 478
- Clarenbach P., 1995, Recommendations for the diagnosis and therapy of insomnia, Nervenarzt, 66, 723
- Harter C., 1999, Entwicklung eines Entzugsdelirs nach Abhängigkeit von Zolpidem und Zopiclon [Development of drug withdrawal delirium after dependence on zolpidem and zoplicone], Psychiatrische Praxis, 26, 309.
- Hofmann M., 1998, Ungestilltes Verlangen: Abhängigkeitssyndrom von Zolpidem (Stilnox) [Unsatisfied craving: zolpidem (Stilnox) dependence syndrome], Psychiatrische Praxis, 25, 313.
- Keup W., 1999, Zolpidem und Zopiclon. Geringeres Missbrauchspotential im Vergleich zu Benzodiazepin‐Hypnotika [Zolpidem and zopiclone. Lower abuse potential in comparison to benzodiazepine hypnotics], Arzneimitteltherapie, 16, 243
- Sanchez L. G., 1996, ], American Journal of Health-System Pharmacy, 53, 26
- 10.1136/bmj.317.7151.146 · DOI
- Sutherland J. C., 1991, ], New Zealand Medical Journal, 104, 103
Cited by
Sorted by citations
Items 301–400 of 409
Themenschwerpunkt: Schlaf- und Beruhigungsmittel im Alter
Wolter, D. K. (2008) · Zeitschrift für Psychiatrie Psychologie und Psychotherapie · doi:10.1024/1661-4747.56.1.19 · Cited by 1
Epidemiology of anxiolytic and hypnotic drug use in the general population in Norway
Hausken, A. M. (2010) · NORA - Norwegian Open Research Archives · Cited by 1
Pharmacology of the GABAAReceptor Complex
Bateson, A. N. (2010) · Medical psychiatry · doi:10.3109/9781420080803.031 · Cited by 1
Wright, B. T. (2016) · doi:10.21007/etd.cghs.2016.0408 · Cited by 1
“To date, there have been conflicting evidence of development of tolerance and withdrawal to zolpidem- in both human and rodent studies [24-27].”
InfluentialAllgulander, C., & Nutt, D. (2014) · Springer eBooks · doi:10.1007/978-3-642-27772-6_113-2 · Cited by 1
Lohse, M. J., & Müller-Oerlinghausen, B. (2006) · Springer eBooks · doi:10.1007/3-540-30505-x_30 · Cited by 1
Substance Abuse: Sedative–Hypnotic or Anxiolytic Use Disorders
Wesson, D. R., & Smith, D. E. (2015) · doi:10.1002/9781118753378.ch79 · Cited by 1
Allgulander, C., & Nutt, D. (2010) · Springer eBooks · doi:10.1007/978-3-540-68706-1_113 · Cited by 1
Block, J. H. (2010) · Burger's Medicinal Chemistry and Drug Discovery · doi:10.1002/0471266949.bmc080.pub2 · Cited by 1
Shbair, M. K. S. (2011) · theses.fr (ABES) · doi:10.70675/1ed36b85zfb74z44edz98cez0ea877c7deda · Cited by 1
Stelzer, F. G., Bacelar, A., Éckeli, A. L., Negrão, A. B., Almeida, C. M. O., Franco, C. M. R., Pires, G. N., Gitaí, L. L. G., Sobreira-Neto, M. A., Assis, M., et al. (2025) · Arquivos de Neuro-Psiquiatria · doi:10.1055/s-0045-1812323 · Cited by 1
Early comorbid parental depression and its effects on child outcomes
Wijlaars, L. P. M. M. (2014) · UCL Discovery (University College London)
Tratamiento biológico del insomnio en el trastorno por uso de sustancias.
Sirvent, C., Prieto, P. B., Rivas, C., Fernández, C., Delgado, R. G., & Palacios, L. (2008) · Psiquiatria.com
Drug-induced synaptic plasticity in addiction : the mesolimbic dopamine pathway and benzodiazepines
Panhelainen, A. E. (2012) · Työväentutkimus Vuosikirja
Mise à jour du site Internet Orithye , base de connaissances médicales sur les pharmacodépendances
Rubat, É. (2008) · OpenGrey (Institut de l'Information Scientifique et Technique)
Pharmacologic Treatment of Insomnia
Mendelson, W. B. (2008) · Psychiatric Annals · doi:10.3928/00485713-20080901-05
Insomnia in the elderly—Is an evidence-based approach possible?
Gray, A. (2005) · South African Family Practice · doi:10.1080/20786204.2005.10873197
Current and Emerging Pharmacotherapies in the Management of Insomnia in Adults
Suh, P. S. A. S. (2013) · Clinical Medicine Reviews in Therapeutics · doi:10.4137/cmrt.s10265 · Cited by 1
O’Sullivan, D. (2014) · Arrow@dit (Dublin Institute of Technology)
Geisler, P., & Crönlein, T. (2014) · Schlaf · doi:10.1055/s-0038-1626104
Chowdhuri, S. (2011) · Humana Press eBooks · doi:10.1007/978-1-60761-735-8_2
Abrahamsson, T. (2016) · Lund University Publications (Lund University)
TheMedicalization of Sleeplessness: APublic HealthConcern
Moloney, M., & Zimmer, C. (2011)
Behandlung der Benzodiazepinabhängigkeit
Rumpf, H. (2009) · Psychiatrie und Psychotherapie up2date · doi:10.1055/s-0028-1090107
Clay, E., Falissard, B., Moore, N. D., & Toumi, M. (2012) · Value in Health · doi:10.1016/j.jval.2012.08.529
BEI DER BEDARFSMEDIKATION STATIONÄRER PATIENTEN MIT EINER SCHWEREN DEPRESSIVEN EPISODE
Lehrstuhl, A. D., Pychiatrie, F., & Medizin, F. (2014)
Acute Kidney Injury due to Rbadomyolysis Complicated with Zolpidem Overdose
Kim, H. I., Jo, S. H., Hong, H., Lee, I. H., Ahn, K. S., & Kang, G. W. (2016) · Korean Journal of Medicine · doi:10.3904/kjm.2016.90.6.550
Conroy, D. A., Arnedt, J. T., & Brower, K. J. (2016) · doi:10.3109/9781420080803-18
The Role of Sleep and Light Therapy in Depression
May-Davis, R. (2015) · CRC Press eBooks · doi:10.1201/b19089-23
7 of Hypnotics on Sleep and Quality of Life in Insomnia
Alford, C., & Wilson, S. J. (2008)
Hypoxic-Ischemic Encephalopathy after Bee Sting and Treatment with Zolpidem: A Case Report
Demir, T., Erdem, M., Tantik, A., & Bıçakçı, Ş. (2016) · Turkish Journal Of Neurology · doi:10.4274/tnd.92005
Insomnie et attaques de panique : apport de la pleine conscience
Vanhuffel, H., & Bat‐Pitault, F. (2016) · Médecine du Sommeil · doi:10.1016/j.msom.2016.09.001
Injuries Among Elderly Canadians: Psychotropic Medications and the Impact of Alcohol
Riley, N. M. (2012) · TSpace (University of Toronto)
When Treatment Turns to Addiction: Emerging Issues in Over-the-Counter and Prescription Drug Abuse
Li, B. T., Moukaddam, N. J., Parks, K. D. L., & Shah, A. A. (2018) · Psychiatric Annals · doi:10.3928/00485713-20180719-01
Integrative Approach to Sedative-Hypnotic Use Disorder
Rees, G., Shapiro, B., & Torrington, M. (2018) · Oxford University Press eBooks · doi:10.1093/med/9780190275334.003.0005
Psychopharmaka und das Risiko von Stürzen in der stationären geriatrischen Versorgung
Wedmann, F. (2019) · eDiss (Georg-August-Universität Göttingen) · doi:10.53846/goediss-7608
Drugs to Treat Substance Use Disorders
Sinclair, J., & Peters, L. (2020) · Cambridge University Press eBooks · doi:10.1017/9781911623465.017
Prescription Drug Abuse: Risks, Diversion, and Prevention
Bramness, J. G. (2020) · Springer eBooks · doi:10.1007/978-3-030-36391-8_22
Psychiatric Disorders, Personality, and Developmental Factors
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.009
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.015
Use Disorders of Cocaine and Methamphetamine
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.014
Tranquilizers and Sedative Use Disorders
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.016
Dependencia y abstinencia de zolpidem. Reporte de un caso de convulsiones generalizadas
Eyler, G. E. B., & Castro, J. V. U. (2021) · Revista Colombiana de Psiquiatría · doi:10.1016/j.rcp.2021.06.007
Herberger, S., Rüther, E., & Hajak, G. (2021) · Springer eBooks · doi:10.1007/978-3-319-56015-1_421-1
Self-citationMora, A. G., & López, F. J. V. (2003) · Dialnet (Universidad de la Rioja)
Lohse, M. J. (2021) · Springer eBooks · doi:10.1007/978-3-662-63825-5_28
Pollmächer, T., & Wetter, T. (2008) · Springer eBooks · doi:10.1007/978-3-540-68748-1_48
Lohse, M. J., & Müller-Oerlinghausen, B. (2010) · Springer eBooks · doi:10.1007/978-3-642-13380-0_28
Lohse, M. J., & Müller-Oerlinghausen, B. (2012) · Springer eBooks · doi:10.1007/978-3-642-29242-2_28
Psychopharmakotherapie – klinisch-empirische Grundlagen
Volz, H., Kasper, S. F., & Möller, H. ‐. (2015) · Springer eBooks · doi:10.1007/978-3-642-45028-0_31-1
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.018
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.001
The Biopsychosocial Perspective and Research Methods for Investigation of Substance Use Disorders
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.002
(2006) · Wiley eBooks · doi:10.1002/9780470041000.cedt076
Conroy, D. A., Arnedt, J. T., & Brower, K. J. (2010) · Medical psychiatry · doi:10.3109/9781420080803.016
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.010
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.004
Genetic Influence on Substance Use Disorders
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.007
Brain Function and Substance Use Disorders
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.006
Tobacco Use and Nicotine Addiction
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.012
Behavioral, Cognitive, and Social Factors Promoting SUD
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.008
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.005
Diagnosis of Substance Use Disorders
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.003
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.011
Treatment of Substance Use Disorders
Duncan, P. M. (2020) · Cambridge University Press eBooks · doi:10.1017/9781139025515.017
Neukirchen, F. S. (2019) · doi:10.53846/goediss-7696
Buckley, P., Prewette, D., Bird, J., & Harrison, G. (2004) · CRC Press eBooks · doi:10.1201/b13311-22
(2019) · American Psychiatric Association Publishing eBooks · doi:10.1176/appi.books.9781615372300.as07
Allgulander, C., & Nutt, D. (2015) · Springer eBooks · doi:10.1007/978-3-642-36172-2_113
Lohse, M. J., & Müller-Oerlinghausen, B. (2008) · Springer eBooks · doi:10.1007/978-3-540-72548-0_29
Lohse, M. J., & Müller-Oerlinghausen, B. (2009) · Springer eBooks · doi:10.1007/978-3-642-01080-4_28
Reuter, J. (2018) · Elsevier eBooks · doi:10.1016/b978-3-437-15340-2.00004-5
Pharmacologic treatment of insomnia
Harris, S., Thorpy, M., & Monderer, R. (2021) · Reference Module in Neuroscience and Biobehavioral Psychology · doi:10.1016/b978-0-12-822963-7.00101-8
(2006) · Kluwer Academic Publishers eBooks · doi:10.1007/0-387-25733-0_2
Lohse, M. J., & Müller-Oerlinghausen, B. (2007) · Springer eBooks · doi:10.1007/978-3-540-34370-7_29
(2019) · American Psychiatric Association Publishing eBooks · doi:10.1176/appi.books.9781615372997.as07
Jang, D. H., & Nelson, L. S. (2012) · Springer eBooks · doi:10.1007/978-3-642-00418-6_852
Lohse, M. J. (2020) · Springer eBooks · doi:10.1007/978-3-662-62168-4_27
Taylor, D. J., Gehrman, P., Dautovich, N. D., Lichstein, K. L., & McCrae, C. S. (2014) · doi:10.1007/978-1-907673-73-3_4 · Cited by 1
Wiegand, M. H., & Hajak, G. (2006) · Springer eBooks · doi:10.1007/3-540-30887-3_20
Self-citationHerberger, S., Rüther, E., & Hajak, G. (2022) · Springer eBooks · doi:10.1007/978-3-030-62059-2_421
Self-citationComparative Analysis of decreased Mental state Patients after Overdose with Sedative-hypnotics
Oh, S. J., Cho, S. H., & Ryu, S. Y. (2022) · Journal of the Korean society of clinical toxicology · doi:10.22537/jksct.2022.20.1.8
Youdin, R. (2023) · Oxford University Press eBooks · doi:10.1093/oso/9780197575024.003.0005
Zolpidem, receita B ou controle especial?
Bertoldo, A., Abujamra, I. M., Zanardi, H. C., Tabushi, F. Y., & Hortense, V. H. S. (2024) · Debates em Psiquiatria · doi:10.25118/2763-9037.2024.v14.1138
Mood Disorders and Comorbid Substance Use Disorders
Weaver, M. F., Heads, A. M. B., & Faillace, L. A. (2024) · Cambridge University Press eBooks · doi:10.1017/9781108973922.013
Chopra, A., Weilburg, J. B., & Winkelman, J. W. (2024) · Elsevier eBooks · doi:10.1016/b978-0-443-11844-9.00022-9
Evaluation of the protective effect of vitamin E on sperm parameters in the mice exposed to zolpidem
Karimi, M., Sheibani, M. T., Tootian, Z., Fazelipour, S., & Babaei, M. (2024) · Qur̓ān/pizhūhī-i khāvar/shināsān · doi:10.61186/iau.34.1.2
(2024) · American Psychiatric Association Publishing eBooks · doi:10.1176/appi.books.9798894551289.cd07
Scott-Ham, M. (2024) · Encyclopedia of Forensic and Legal Medicine · doi:10.1016/b978-0-443-21441-7.00291-0
Korobchuk, V. M., Zagrichuk, G. Y., Mykhalkiv, M. M., Yatsyuk, V. M., & Івануса, І. Б. (2024) · Medical and Clinical Chemistry · doi:10.11603/mcch.2410-681x.2024.i2.14779
Fast urine metabolomics for the assessment of Zopiclone effects on insomnia
Li, J., Zhao, Y., Liu, G., & Li, T. (2025) · Journal of Pharmacological and Toxicological Methods · doi:10.1016/j.vascn.2025.107745
Fu, Y., Zhang, S., Yan, Y., Xiang, P., Li, J., Xin, L., Deng, H., Wu, H., & Wang, X. (2025) · Journal of Forensic and Legal Medicine · doi:10.1016/j.jflm.2025.103052
Scharner, V., Hasieber, L., Sönnichsen, A. C., & Mann, E. (2023) · Figshare · doi:10.6084/m9.figshare.22604821
Scharner, V., Hasieber, L., Sönnichsen, A. C., & Mann, E. (2022) · Figshare · doi:10.6084/m9.figshare.19101642
Scharner, V., Hasieber, L., Sönnichsen, A. C., & Mann, E. (2023) · Figshare · doi:10.6084/m9.figshare.22604830
Scharner, V., Hasieber, L., Sönnichsen, A. C., & Mann, E. (2023) · Figshare · doi:10.6084/m9.figshare.22604827
Metadata
- Authors
- Hajak, G., Müller, W. E., Wittchen, H. U., Pittrow, D., & Kirch, W.
- Affiliations
- University of Regensburg (DE)
- Goethe University Frankfurt (DE)
- Technische Universität Dresden (DE)
- Corresponding author
- Hajak, G.
- Venue
- Addiction
- Publisher
- Wiley
- Published
- 2003-10
- Volume
- 98
- Issue
- 10
- Pages
- 1371-1378
- ISSN
- 0965-2140 (ISSN-L)
- 1360-0443
- OpenAlex
- W2116289594
- Cited by
- 404
- References
- 74
- Citations by year
- 2026: 3 · 2025: 7 · 2024: 10 · 2023: 19 · 2022: 11 · 2021: 16 · 2020: 29 · 2019: 21 · 2018: 17 · 2017: 13 · 2016: 25 · 2015: 13 · 2014: 27 · 2013: 19 · 2012: 20
- FWCI
- 2.30
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Addiction (publishedVersion)
- PubMed (publishedVersion)
- University of Regensburg Publication Server (University of Regensburg) (submittedVersion)
- Topics
- Health Sciences › Medicine › Epidemiology › Substance Abuse Treatment and Outcomes
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and related disorders
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Opioid Use Disorder Treatment
- Keywords
- zolpidem, zopiclone, non-benzodiazepine hypnotics, drug addiction, drug abuse, insomnia treatment, benzodiazepine alternatives, prescribing patterns, psychiatric comorbidity, withdrawal, drug safety
- MeSH terms
- Zolpidem, Adult, Aged, Female, Humans, Hypnotics and Sedatives, Male, Middle Aged, Piperazines, Pyridines, Substance-Related Disorders, Azabicyclo Compounds
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review