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Opioid Epidemic

Public Health and Nutrition · NLM MeSH · updated 2026-11-04 · version 1

Citations verified against PubMedNot yet clinician-reviewed10 referencesApproximately 7 min read

Widespread use of opioids by disproportionately large numbers of individuals within a population, community, or region occurring within a relatively narrow window of time.

Table of Contents

1. Definition2. Research landscape3. Reading the evidence4. Open-access studies5. Key reviews6. Full-text reviews7. References8. About this article

Definition and research guide

This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.

Content available: 4 complete abstracts (1,337 words), 10 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.

Definition

Widespread use of opioids by disproportionately large numbers of individuals within a population, community, or region occurring within a relatively narrow window of time.

Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.

Also known as: Epidemics, Opioid; Opioid Epidemics; Epidemic, Opioid; Opiate Epidemic; Epidemic, Opiate; Epidemics, Opiate; Opiate Epidemics; Opioid Crisis.

Where it fits in the MeSH classification

Broader topics
Epidemics

Related concepts

  • Opioids

Research landscape

PubMed indexes 1,121 records tagged with the MeSH heading “Opioid Epidemic” (counts retrieved 2026-10-31). 872 of them (77.8%) were published from 2020 onward, and the busiest period so far is 2020 onward with 872 records.

Reviews account for 174 records (15.5%) and meta-analyses for 0. Randomized controlled trials number 9 (0.8%) as a share of all records on the topic. Randomized trials make up only a small share of this literature, so much of what is known comes from laboratory, observational or descriptive work.

PubMed records by publication periodthrough 1999: 0 records; 2000-2009: 0 records; 2010-2019: 292 records; 2020 onward: 872 records0through 199902000-20092922010-20198722020 onward
Records in PubMed indexed with this heading, by publication period. Real counts from NCBI E-utilities; the final period covers only part of the current year. Volume reflects how much has been published, not how strong the evidence is.
Show the data
PeriodRecords
through 19990
2000-20090
2010-2019292
2020 onward872
Share of records by publication typeReviews: 15.5 percent; Meta-analyses: 0.0 percent; Randomized controlled trials: 0.8 percentReviews15.5% (174)Meta-analyses0.0% (0)Randomized controlled trials0.8% (9)
Share of all PubMed records on this heading that carry each publication type. Types overlap with other records, so the shares do not sum to 100%.
Publication-type chart data
Publication types among 1,121 PubMed records
TypeRecordsShare
Reviews17415.5%
Meta-analyses00.0%
Randomized controlled trials90.8%

Method: PubMed query "Opioid Epidemic"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-31.

Reading the evidence in public health and nutrition

Population and nutrition studies mostly observe what people eat, breathe or are exposed to and then look for links with health, which shows association and not proof of cause. Self-reported diet is imprecise, people who eat or live differently also differ in other ways, and effects measured across a population may not apply to one person. Check the study design, how exposure was measured, what else was accounted for and the size of the effect, not only whether it was statistically significant.

Evidence from open-access studies

These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.

Study comparison — selected abstracts, not a systematic review
Study / authorsYearSource label / designEurope PMC citationsLicence / source
Polysubstance use in the U.S. opioid crisis
Compton WM, Valentino RJ, DuPont RL
2021Review article
Design not recorded in structured metadata
223cc by
PMID 33188253 · DOI · PMC7815508
Systematic Evaluation of State Policy Interventions Targeting the US Opioid Epidemic, 2007-2018
Lee B, Zhao W, Yang KC, Ahn YY, Perry BL
2021Research article
Design not recorded in structured metadata
134cc by
PMID 33576816 · DOI · PMC7881356
The Opioid Epidemic Within the COVID-19 Pandemic: Drug Testing in 2020
Niles JK, Gudin J, Radcliff J, Kaufman HW
2021Research article
Design not recorded in structured metadata
112cc by
PMID 33031013 · DOI · PMC7875135
Pain Medicine and the Opioid Crisis: Time to Own Our Responsibility!
Ritchie D, Forget P
2026Research article
Design not recorded in structured metadata
0cc by
PMID 41934367 · DOI · PMC13050136

Polysubstance use in the U.S. opioid crisis [1]

Review article Compton WM, Valentino RJ, DuPont RL · · 2021 · cited 223 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
Interventions to address the U.
Closing excerpt
By addressing the multiple patterns of consumption and the reasons that people mix opioids with other substances, interventions and research may be enhanced.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (194 words)

Interventions to address the U.S. opioid crisis primarily target opioid use, misuse, and addiction, but because the opioid crisis includes multiple substances, the opioid specificity of interventions may limit their ability to address the broader problem of polysubstance use. Overlap of opioids with other substances ranges from shifts among the substances used across the lifespan to simultaneous co-use of substances that span similar and disparate pharmacological categories. Evidence suggests that nonmedical opioid users quite commonly use other drugs, and this polysubstance use contributes to increasing morbidity and mortality. Reasons for adding other substances to opioids include enhancement of the high (additive or synergistic reward), compensation for undesired effects of one drug by taking another, compensation for negative internal states, or a common predisposition that is related to all substance consumption. But consumption of multiple substances may itself have unique effects. To achieve the maximum benefit, addressing the overlap of opioids with multiple other substances is needed across the spectrum of prevention and treatment interventions, overdose reversal, public health surveillance, and research. By addressing the multiple patterns of consumption and the reasons that people mix opioids with other substances, interventions and research may be enhanced.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 33188253 · DOI · PMC7815508

Systematic Evaluation of State Policy Interventions Targeting the US Opioid Epidemic, 2007-2018 [2]

Research article Lee B, Zhao W, Yang KC, Ahn YY, Perry BL · · 2021 · cited 134 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
ImportanceIn response to the increase in opioid overdose deaths in the United States, many states recently have implemented supply-controlling and harm-reduction policy measures.
Closing excerpt
This finding suggests that there is no easy policy solution to reverse the epidemic of opioid dependence and mortality in the US.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (590 words)

ImportanceIn response to the increase in opioid overdose deaths in the United States, many states recently have implemented supply-controlling and harm-reduction policy measures. To date, an updated policy evaluation that considers the full policy landscape has not been conducted.ObjectiveTo evaluate 6 US state-level drug policies to ascertain whether they are associated with a reduction in indicators of prescription opioid abuse, the prevalence of opioid use disorder and overdose, the prescription of medication-assisted treatment (MAT), and drug overdose deaths.Design, setting, and participantsThis cross-sectional study used drug overdose mortality data from 50 states obtained from the National Vital Statistics System and claims data from 23 million commercially insured patients in the US between 2007 and 2018. Difference-in-differences analysis using panel matching was conducted to evaluate the prevalence of indicators of prescription opioid abuse, opioid use disorder and overdose diagnosis, the prescription of MAT, and drug overdose deaths before and after implementation of 6 state-level policies targeting the opioid epidemic. A random-effects meta-analysis model was used to summarize associations over time for each policy and outcome pair. The data analysis was conducted July 12, 2020.ExposuresState-level drug policy changes to address the increase of opioid-related overdose deaths included prescription drug monitoring program (PDMP) access, mandatory PDMPs, pain clinic laws, prescription limit laws, naloxone access laws, and Good Samaritan laws.Main outcomes and measuresThe outcomes of interests were quarterly state-level mortality from drug overdoses, known indicators for prescription opioid abuse and doctor shopping, MAT, and prevalence of drug overdose and opioid use disorder.ResultsThis cross-sectional study of drug overdose mortality data and insurance claims data from 23 million commercially insured patients (12 582 378 female patients [55.1%]; mean [SD] age, 45.9 [19.9] years) in the US between 2007 and 2018 found that mandatory PDMPs were associated with decreases in the proportion of patients taking opioids (-0.729%; 95% CI, -1.011% to -0.447%), with overlapping opioid claims (-0.027%; 95% CI, -0.038% to -0.017%), with daily morphine milligram equivalent greater than 90 (-0.095%; 95% CI, -0.150% to -0.041%), and who engaged in drug seeking (-0.002%; 95% CI, -0.003% to -0.001%). The proportion of patients receiving MAT increased after the enactment of mandatory PDMPs (0.015%; 95% CI, 0.002% to 0.028%), pain clinic laws (0.013%, 95% CI, 0.005%-0.021%), and prescription limit laws (0.034%, 95% CI, 0.020% to 0.049%). Mandatory PDMPs were associated with a decrease in the number of overdose deaths due to natural opioids (-518.5 [95% CI, -728.5 to -308.5] per 300 million people) and methadone (-122.7 [95% CI, -207.5 to -37.8] per 300 million people). Prescription drug monitoring program access policies showed similar results, although these policies were also associated with increases in overdose deaths due to synthetic opioids (380.3 [95% CI, 149.6-610.8] per 300 million people) and cocaine (103.7 [95% CI, 28.0-179.5] per 300 million people). Except for the negative association between prescription limit laws and synthetic opioid deaths (-723.9 [95% CI, -1419.7 to -28.1] per 300 million people), other policies were associated with increasing overdose deaths, especially those attributed to non-prescription opioids such as synthetic opioids and heroin. This includes a positive association between naloxone access laws and the number of deaths attributed to synthetic opioids (1338.2 [95% CI, 662.5 to 2014.0] per 300 million people).Conclusions and relevanceAlthough this study found that existing state policies were associated with reduced misuse of prescription opioids, they may have the unintended consequence of motivating those with opioid use disorders to access the illicit drug market, potentially increasing overdose mortality. This finding suggests that there is no easy policy solution to reverse the epidemic of opioid dependence and mortality in the US.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 33576816 · DOI · PMC7881356

The Opioid Epidemic Within the COVID-19 Pandemic: Drug Testing in 2020 [3]

Research article Niles JK, Gudin J, Radcliff J, Kaufman HW · · 2021 · cited 112 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
The convergence of the opioid epidemic and the coronavirus disease 2019 (COVID-19) pandemic has created new health care challenges.
Closing excerpt
The convergence of the drug abuse epidemic and COVID-19 pandemic has led to an increased need for health care and public health resources dedicated to supporting vulnerable patients and addressing the underlying causes of these disturbing trends.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (248 words)

The convergence of the opioid epidemic and the coronavirus disease 2019 (COVID-19) pandemic has created new health care challenges. The authors analyzed changes in clinical drug testing patterns and results at a national clinical laboratory, comparing data obtained before and during the pandemic. Testing for prescription and illicit drugs declined rapidly during the pandemic, with weekly test volumes falling by approximately 70% from the baseline period to the trough (the week beginning March 29) before rising in subsequent weeks. Among individuals tested, positivity increased by 35% for non-prescribed fentanyl and 44% for heroin during the pandemic. Positivity for non-prescribed fentanyl increased significantly among patients positive for other drugs: by 89% for specimens positive for amphetamines; 48% for benzodiazepines; 34% for cocaine; and 39% for opiates (P < 0.01 for all comparisons). These findings suggest significant increases in dangerous drug combinations. Positivity for non-prescribed use of many other drugs remained consistent or declined for some drugs, relative to pre-pandemic patterns. Models adjusting for potential confounding variables, including medication-assisted treatment and treatment at a substance use disorder facility indicated that the risk for non-prescribed fentanyl positivity rose by more than 50% during the pandemic. In summary, these findings demonstrate decreased drug testing overall, with increased positivity for high-risk drugs and dangerous drug combinations. The convergence of the drug abuse epidemic and COVID-19 pandemic has led to an increased need for health care and public health resources dedicated to supporting vulnerable patients and addressing the underlying causes of these disturbing trends.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 33031013 · DOI · PMC7875135

Pain Medicine and the Opioid Crisis: Time to Own Our Responsibility! [4]

Research article Ritchie D, Forget P · · 2026

Abstract reading summary — source excerpts
Opening excerpt
Pain remains a major unmet health need.
Closing excerpt
These recommendations aim to reduce harms, improve pain and mental-health outcomes and guide clinicians and policymakers toward better and more equitable care.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (305 words)

Pain remains a major unmet health need. Rising opioid prescribing has not reduced population pain and has directly contributed to increased morbidity and mortality. Opioid use disorder (OUD) and pain frequently coexist. Many people with OUD experience acute and chronic pain and a substantial proportion of patients prescribed opioids develop OUD. We have contributed to this problem. In this Position Paper, we defend the idea that we must urgently redefine pain medicine as a frontline discipline in opioid use disorder prevention and recovery. Pain management must be reframed as part of the solution for people with or at risk of OUD. Core principles include: early identification of OUD and psychiatric comorbidity, routine incorporation of trauma-informed, stigma-reducing communication and shared decision-making; continuation of opioid agonist therapy during acute care; use of tailored multimodal, opioid-sparing analgesia; and perioperative planning with addiction and primary care follow-up. At a system level, we recommend multidisciplinary opioid stewardship, clear limits on opioid indication, dose and duration, diversion-mitigation strategies and policy changes such as reduced pack sizes and limiting indications for prolonged-released opioids. Research priorities include qualitative studies of lived experience, inclusion of patient-reported outcomes in trials and big-data analyses of prescribing to identify targets for intervention. Integrating clinical best practice, stigma-aware care and system reforms can reduce harm while ensuring equitable, effective pain relief for people with pain and those with or at risk of OUD. SIGNIFICANCE: This position paper synthesises clinical, psychosocial and system-level strategies to manage pain in people with or at risk of OUD. It emphasises our unique responsibility by learning from failures, and constructively sees the future. Treatment continuity, trauma-informed and stigma-reducing communication, integrated care, interdisciplinary coordination and opioid stewardship policies are no longer optional. These recommendations aim to reduce harms, improve pain and mental-health outcomes and guide clinicians and policymakers toward better and more equitable care.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41934367 · DOI · PMC13050136

Key reviews and meta-analyses

The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.

  • Research article The rise of illicit fentanyls, stimulants and the fourth wave of the opioid overdose crisis [5]
    Ciccarone D · Curr Opin Psychiatry · 2021 · cited 767 times (Europe PMC)
  • Research article The changing opioid crisis: development, challenges and opportunities [6]
    Volkow ND, Blanco C · Mol Psychiatry · 2021 · cited 413 times (Europe PMC)
  • Research article Responding to the opioid crisis in North America and beyond: recommendations of the Stanford-Lancet Commission [7]
    Humphreys K, Shover CL, Andrews CM, Bohnert ASB, Brandeau ML, Caulkins JP, et al. · Lancet · 2022 · cited 346 times (Europe PMC)
  • Research article Methamphetamine use in the United States: epidemiological update and implications for prevention, treatment, and harm reduction [8]
    Jones CM, Houry D, Han B, Baldwin G, Vivolo-Kantor A, Compton WM · Ann N Y Acad Sci · 2022 · cited 173 times (Europe PMC)
  • Research article Noradrenergic Mechanisms in Fentanyl-Mediated Rapid Death Explain Failure of Naloxone in the Opioid Crisis [9]
    Torralva R, Janowsky A · J Pharmacol Exp Ther · 2019 · cited 132 times (Europe PMC)
  • Research article Oxycodone in the Opioid Epidemic: High 'Liking', 'Wanting', and Abuse Liability [10]
    Kibaly C, Alderete JA, Liu SH, Nasef HS, Law PY, Evans CJ, et al. · Cell Mol Neurobiol · 2021 · cited 94 times (Europe PMC)

Full-text reviews on EvidenceLib

Open-access review articles about this topic, reproduced in full with authors, licence and references.

  • Opioid prescription patterns in Germany and the global opioid epidemic: Systematic review of available evidence

    Bastian Rosner, Jessica Neicun, Justin Christopher Yang et al. · PLoS ONE 2019 · CC BY 4.0

References

  1. Compton WM, Valentino RJ, DuPont RL. Polysubstance use in the U.S. opioid crisis. . 2021. PMID 33188253 · DOI · PMC7815508
  2. Lee B, Zhao W, Yang KC, Ahn YY, Perry BL. Systematic Evaluation of State Policy Interventions Targeting the US Opioid Epidemic, 2007-2018. . 2021. PMID 33576816 · DOI · PMC7881356
  3. Niles JK, Gudin J, Radcliff J, Kaufman HW. The Opioid Epidemic Within the COVID-19 Pandemic: Drug Testing in 2020. . 2021. PMID 33031013 · DOI · PMC7875135
  4. Ritchie D, Forget P. Pain Medicine and the Opioid Crisis: Time to Own Our Responsibility!. . 2026. PMID 41934367 · DOI · PMC13050136
  5. Ciccarone D. The rise of illicit fentanyls, stimulants and the fourth wave of the opioid overdose crisis. Curr Opin Psychiatry. 2021. PMID 33965972 · DOI · PMC8154745
  6. Volkow ND, Blanco C. The changing opioid crisis: development, challenges and opportunities. Mol Psychiatry. 2021. PMID 32020048 · DOI · PMC7398847
  7. Humphreys K, Shover CL, Andrews CM, Bohnert ASB, Brandeau ML, Caulkins JP, et al.. Responding to the opioid crisis in North America and beyond: recommendations of the Stanford-Lancet Commission. Lancet. 2022. PMID 35122753 · DOI · PMC9261968
  8. Jones CM, Houry D, Han B, Baldwin G, Vivolo-Kantor A, Compton WM. Methamphetamine use in the United States: epidemiological update and implications for prevention, treatment, and harm reduction. Ann N Y Acad Sci. 2022. PMID 34561865 · DOI · PMC9097961
  9. Torralva R, Janowsky A. Noradrenergic Mechanisms in Fentanyl-Mediated Rapid Death Explain Failure of Naloxone in the Opioid Crisis. J Pharmacol Exp Ther. 2019. PMID 31492824 · DOI · PMC6863461
  10. Kibaly C, Alderete JA, Liu SH, Nasef HS, Law PY, Evans CJ, et al.. Oxycodone in the Opioid Epidemic: High 'Liking', 'Wanting', and Abuse Liability. Cell Mol Neurobiol. 2021. PMID 33245509 · DOI · PMC8155122

About this article

Sources
NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
Verification
Every reference was resolved against PubMed on 2026-11-04; title, year and DOI matched.
Review state
automated source verified; no human expert review has been recorded yet.
Version
1, last updated 2026-11-04.

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At a glance

1,121
PubMed records on this heading
78%
published since 2020
174
review articles
9
randomized trials
10
verified references below

Counts come from PubMed on 2026-10-31; they show how much has been written, not how strong the evidence is.

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