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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.
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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]
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Raising awareness about sleep disorders
Jaiswal, S. J., Owens, R. L., & Malhotra, A. (2017) · Lung India · doi:10.4103/0970-2113.205331 · Cited by 54
“Lung India • Volume 34 • Issue 3 • May - June 2017 265 recommended due to issues with dependence, tolerance, as well as medication side effects.[69-71] Interestingly, cognitive behavioral therapy (CBT) has been shown to improve sleep quality, as measured by sleep efficiency, time spent in slow-wave sleep, and total sl…”
BackgroundSun, T., Ali, M. M., Wang, D., & Du, Z. (2019) · Journal of Chromatography A · doi:10.1016/j.chroma.2019.460547 · Cited by 48
Pharmacological Treatment of Insomnia in Alcohol Recovery: A Systematic Review
Kolla, B. P., Mansukhani, M. P., & Schneekloth, T. D. (2011) · Alcohol and Alcoholism · doi:10.1093/alcalc/agr073 · Cited by 44
Schoedel, K. A., Sun, H., Sellers, E. M., Faulknor, J., Levy‐Cooperman, N., Li, X., Kennedy, W. P., Cha, J., Lewis, N. M., Liu, W., et al. (2016) · Journal of Clinical Psychopharmacology · doi:10.1097/jcp.0000000000000516 · Cited by 42
Burke, S. L., Hu, T., Spadola, C., Li, T., Naseh, M., Burgess, A., & Cadet, T. J. (2018) · Sleep Medicine · doi:10.1016/j.sleep.2018.09.001 · Cited by 40
Engin, E., Bakhurin, K. I., Smith, K. S., Hines, R. M., Reynolds, L. M., Tang, W., Sprengel, R., Moss, S. J., & Rudolph, U. (2014) · Neuropsychopharmacology · doi:10.1038/npp.2014.41 · Cited by 40
“…compounds, have highlighted the role of the a1GABAARs in the self-administration of and the preference for benzodiazepines, as well as in the plastic changes in the VTA following benzodiazepine administration (eg, Hajak et al, 2003; Rowlett et al, 2005; Heikkinen et al, 2009; Tan et al, 2010).”
BackgroundWright, B. T., Gluszek, C. F., & Heldt, S. A. (2014) · Psychopharmacology · doi:10.1007/s00213-014-3473-x · Cited by 41
“2012), numerous cases of zolpidem abuse and dependence have been reported in individuals using supratherapeutic doses (Hajak et al. 2003; Victorri-Vigneau et al. 2007).”
BackgroundMini, L. J., Wang‐Weigand, S., & Zhang, J. (2007) · The American Journal of Geriatric Pharmacotherapy · doi:10.1016/j.amjopharm.2007.09.004 · Cited by 40
BARBIERI, I. A., Oliveira, M. L. S., Bruckmann, F. D. S., Salles, T. D. R., Zancanaro, L. V., Silva, L. F. O., Dotto, G. L., Lima, E. C., Naushad, M., & Rhoden, C. R. B. (2023) · Journal of Molecular Liquids · doi:10.1016/j.molliq.2023.123657 · Cited by 39
Leufkens, T., & Vermeeren, A. (2013) · Clinical Therapeutics · doi:10.1016/j.clinthera.2013.11.005 · Cited by 39
Mirza, N. R., & Nielsen, E. Ø. (2006) · The Journal of Pharmacology and Experimental Therapeutics · doi:10.1124/jpet.105.094474 · Cited by 38
Verbrauch von Zolpidem und Zopiclon auf Privatrezepten zwischen 1993 und 2007
Hoffmann, F., Scharffetter, W., & Glaeske, G. (2009) · Der Nervenarzt · doi:10.1007/s00115-008-2648-2 · Cited by 38
4-Fluorosulfonylpiperidines: Selective 5-HT2A ligands for the treatment of insomnia
Fish, L. R., Gilligan, M. T., Humphries, A. C., Ivarsson, M., Ladduwahetty, T., Merchant, K. J., O'Connor, D. V., Patel, S. S., Philipps, E., Vargas, H. M., et al. (2005) · Bioorganic & Medicinal Chemistry Letters · doi:10.1016/j.bmcl.2005.05.104 · Cited by 37
McHugh, R. K., Votaw, V. R., Trapani, E. W., & McCarthy, M. D. (2023) · Frontiers in Psychiatry · doi:10.3389/fpsyt.2023.1129447 · Cited by 38
Lapeyre‐Mestre, M., Gony, M., Carvajal, A., Saint-Gerons, D. M., Conforti, A., D’Incau, P., Heerdink, E. R., van der Stichele, R., Bergman, U., & The OSIAP Europe Study Group (2014) · European Addiction Research · doi:10.1159/000356812 · Cited by 36
Treating insomnia with medications
Pagel, J. F., Pandi-Perumal, S. R., & Monti, J. M. (2018) · Sleep Science and Practice · doi:10.1186/s41606-018-0025-z · Cited by 43
“While all hypnotics have abuse potential for individuals with addictive histories and personalities, these agents have been noted to have minimal additive potential (Hajak et al. 2003).”
BackgroundSzmulewicz, A., Bateman, B. T., Levin, R., & Huybrechts, K. F. (2021) · American Journal of Psychiatry · doi:10.1176/appi.ajp.2020.20071038 · Cited by 56
Zolpidem abuse, dependence and withdrawal syndrome: sex as susceptibility factor for adverse effects
Cubała, W. J., Landowski, J., & Wichowicz, H. M. (2008) · British Journal of Clinical Pharmacology · doi:10.1111/j.1365-2125.2007.03028.x · Cited by 34
Jeong, Y.-D., Kim, M. K., Suh, S. I., In, M. K., Kim, J. Y., & Paeng, K. (2015) · Forensic Science International · doi:10.1016/j.forsciint.2015.07.043 · Cited by 34
“BDZ often had unexpected side effects including a high potential for abuse [4].”
BackgroundNonmedical use of benzodiazepines and Z‐drugs in the UK
Hockenhull, J., Black, J. C., Haynes, C. M., Rockhill, K. M., Dargan, P. I., Dart, R. C., & Wood, D. M. (2020) · British Journal of Clinical Pharmacology · doi:10.1111/bcp.14397 · Cited by 34
Hsiao, F., Hsieh, P.-H., & Gau, C. (2013) · Journal of Clinical Gerontology and Geriatrics · doi:10.1016/j.jcgg.2012.12.001 · Cited by 34
Long‐term Use of Z‐Hypnotics and Co‐medication with Benzodiazepines and Opioids
Sakshaug, S., Handal, M., Hjellvik, V., Berg, C., Ripel, Å., Gustavsen, I., Mørland, J. G., & Skurtveit, S. O. (2016) · Basic & Clinical Pharmacology & Toxicology · doi:10.1111/bcpt.12684 · Cited by 33
Insomnia in Patients with Depression
Jindal, R. D. (2009) · CNS Drugs · doi:10.2165/00023210-200923040-00004 · Cited by 33
Dependence on zolpidem: two case reports of detoxification with flumazenil infusion
Quaglio, G., Lugoboni, F., Fornasiero, A., Lechi, A., Gerra, G., & Mezzelani, P. (2005) · International Clinical Psychopharmacology · doi:10.1097/01.yic.0000166404.41850.b4 · Cited by 33
“cases of zolpidem-dependent patients, including the two above-mentioned cases, are described in literature (Hajak et al., 2003; Liappas et al., 2003; Boulanger-Rostowsky et al., 2004).”
ResultSevere Chronic Abuse of Zolpidem in Refractory Insomnia
Chiaro, G., Castelnovo, A., Bianco, G., Maffei, P., & Manconi, M. (2018) · Journal of Clinical Sleep Medicine · doi:10.5664/jcsm.7240 · Cited by 32
Lou, B. X., & Oks, M. (2021) · Clinics in Geriatric Medicine · doi:10.1016/j.cger.2021.04.003 · Cited by 32
Update on Insomnia after Mild Traumatic Brain Injury
Zhou, Y., & Greenwald, B. D. (2018) · Brain Sciences · doi:10.3390/brainsci8120223 · Cited by 31
“While Z-drugs have a significantly lower incidence of dependence relative to benzodiazepines, there is still a risk of abuse especially in patients with a history of substance abuse, dependence, or psychiatric diseases [79].”
BackgroundClinical Pharmacology of Sleep
Pandi-Perumal, S. R., & Monti, J. M. (2006) · Birkhäuser Basel eBooks · doi:10.1007/3-7643-7440-3 · Cited by 31
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
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