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Polypharmacy

Pharmacology · NLM MeSH · updated 2026-10-29 · version 1

Citations verified against PubMedNot yet clinician-reviewed10 referencesApproximately 5 min read

The use of multiple drugs administered to the same patient, most commonly seen in elderly patients.

Table of Contents

1. Definition2. Research landscape3. Reading the evidence4. Open-access studies5. Key reviews6. References7. 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 (980 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

The use of multiple drugs administered to the same patient, most commonly seen in elderly patients. It includes also the administration of excessive medication. Since in the United States most drugs are dispensed as single-agent formulations, polypharmacy, though using many drugs administered to the same patient, must be differentiated from drug combinations, single preparations containing two or more drugs as a fixed dose, and from drug therapy, combination, two or more drugs administered separately for a combined effect. (From Segen, Dictionary of Modern Medicine, 1992)

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: Polymedication.

Where it fits in the MeSH classification

Broader topics
Drug Therapy; Overtreatment
See also
Drug Antagonism; Drug Combinations; Drug Therapy, Combination; Drug Overdose

Related concepts

  • Drug Combinations
  • Drug Therapy
  • Combination

Research landscape

PubMed indexes 8,337 records tagged with the MeSH heading “Polypharmacy” (counts retrieved 2026-10-29). 3,356 of them (40.3%) were published from 2020 onward, and the busiest period so far is 2010-2019 with 3,780 records.

Reviews account for 1,495 records (17.9%) and meta-analyses for 97. Randomized controlled trials number 304 (3.6%) as a share of all records on the topic.

PubMed records by publication periodthrough 1999: 47 records; 2000-2009: 1,154 records; 2010-2019: 3,780 records; 2020 onward: 3,356 records47through 19991,1542000-20093,7802010-20193,3562020 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 199947
2000-20091,154
2010-20193,780
2020 onward3,356
Share of records by publication typeReviews: 17.9 percent; Meta-analyses: 1.2 percent; Randomized controlled trials: 3.6 percentReviews17.9% (1,495)Meta-analyses1.2% (97)Randomized controlled trials3.6% (304)
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 8,337 PubMed records
TypeRecordsShare
Reviews1,49517.9%
Meta-analyses971.2%
Randomized controlled trials3043.6%

Method: PubMed query "Polypharmacy"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-29.

Reading the evidence in pharmacology

Drug evidence builds in layers: laboratory pharmacology describes how a compound acts, pharmacokinetic studies describe how the body handles it, and randomized trials test whether it helps and what harms it causes. Post-marketing surveillance and observational studies reveal rarer adverse effects but cannot prove causation. This page is educational and is not a recommendation to start, stop or change any medicine; decisions about treatment belong with a qualified clinician.

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
Prevalence and trends of polypharmacy in U.S. adults, 1999-2018
Wang X, Liu K, Shirai K, Tang C, Hu Y, Wang Y, et al.
2023Research article
Design not recorded in structured metadata
98cc by
PMID 37434230 · DOI · PMC10337167
Cumulative Update of a Systematic Overview Evaluating Interventions Addressing Polypharmacy
Keller MS, Qureshi N, Mays AM, Sarkisian CA, Pevnick JM
2024Review article
Design not recorded in structured metadata
41cc by
PMID 38198136 · DOI · PMC10782233
European position paper on polypharmacy and fall-risk-increasing drugs recommendations in the World Guidelines for Falls Prevention and Management: implications and implementation
van der Velde N, Seppala LJ, Hartikainen S, Kamkar N, Mallet L, Masud T, et al.
2023Research article
Design not recorded in structured metadata
31cc by
PMID 37452999 · DOI · PMC10447263
Nonlinear Associations Between Frailty and Medication Burden in Hospitalized Older Adults
Umegaki H, Nakashima H, Mizokami F, Yamada Y, Watanabe K, Fujisawa C, et al.
2026Research article
Design not recorded in structured metadata
6cc by
PMID 42266173 · DOI · PMC13250668

Prevalence and trends of polypharmacy in U.S. adults, 1999-2018 [1]

Research article Wang X, Liu K, Shirai K, Tang C, Hu Y, Wang Y, et al. · · 2023 · cited 98 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
BackgroundPolypharmacy is one of the most important health issues for its potential impacts on disease burden and healthcare costs.
Closing excerpt
The high prevalence urges the healthcare providers and health policymakers to manage polypharmacy among specific population groups.
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 (218 words)

BackgroundPolypharmacy is one of the most important health issues for its potential impacts on disease burden and healthcare costs. The aim of this study was to update a comprehensive picture of prevalence and trends in polypharmacy over 20 years in U.S. adults.MethodsParticipants included 55,081 adults aged ≥ 20 from the National Health and Nutrition Examination Survey, January 1, 1999, through December 31, 2018. The simultaneously use of ≥ 5 drugs in one individual was defined as polypharmacy. National prevalence and trends in polypharmacy were evaluated among U.S. adults within different demo-socioeconomic status and pre-existing diseases.ResultsFrom 1999-2000 to 2017-2018, the overall percentages of adults with polypharmacy remained on the rise, increasing from 8.2% (7.2-9.2%) to 17.1% (15.7-18.5%) (average annual percentage change [AAPC] = 2.9%, P = .001). The polypharmacy prevalence was considerably higher in the elderly (from 23.5% to 44.1%), in adults with heart disease (from 40.6% to 61.7%), and in adults with diabetes (from 36.3% to 57.7%). Also, we observed a greater increase rate of polypharmacy in men (AAPC = 4.1%, P ConclusionsFrom 1999-2000 to 2017-2018, the prevalence of polypharmacy is continually increasing in U.S. adults. The polypharmacy was especially higher in the older, in patients with heart disease, or diabetes. The high prevalence urges the healthcare providers and health policymakers to manage polypharmacy among specific population groups.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 37434230 · DOI · PMC10337167

Cumulative Update of a Systematic Overview Evaluating Interventions Addressing Polypharmacy [2]

Review article Keller MS, Qureshi N, Mays AM, Sarkisian CA, Pevnick JM · · 2024 · cited 41 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
ImportancePolypharmacy is associated with mortality, falls, hospitalizations, and functional and cognitive decline.
Closing excerpt
More evidence is needed regarding which interventions are most useful and which populations would benefit most.
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 (383 words)

ImportancePolypharmacy is associated with mortality, falls, hospitalizations, and functional and cognitive decline. The study of polypharmacy-related interventions has increased substantially, prompting the need for an updated, more focused systematic overview.ObjectiveTo systematically evaluate and summarize evidence across multiple systematic reviews (SRs) examining interventions addressing polypharmacy.Evidence reviewA search was conducted of MEDLINE, the Cochrane Database of Systematic Reviews, and the Database of Abstracts of Reviews of Effects for articles published from January 2017-October 2022, as well as those identified in a previous overview (January 2004-February 2017). Systematic reviews were included regardless of study design, setting, or outcome. The evidence was summarized by 4 categories: (1) medication-related process outcomes (eg, potentially inappropriate medication [PIM] and potential prescribing omission reductions), (2) clinical and functional outcomes, (3) health care use and economic outcomes, and (4) acceptability of the intervention.FindingsFourteen SRs were identified (3 from the previous overview), 7 of which included meta-analyses, representing 179 unique published studies. Nine SRs examined medication-related process outcomes (low to very low evidence quality). Systematic reviews using pooled analyses found significant reductions in the number of PIMs, potential prescribing omissions, and total number of medications, and improvements in medication appropriateness. Twelve SRs examined clinical and functional outcomes (very low to moderate evidence quality). Five SRs examined mortality; all mortality meta-analyses were null, but studies with longer follow-up periods found greater reductions in mortality. Five SRs examined falls incidence; results were predominantly null save for a meta-analysis in which PIMs were discontinued. Of the 8 SRs examining quality of life, most (7) found predominantly null effects. Ten SRs examined hospitalizations and readmissions (very low to moderate evidence quality) and 4 examined emergency department visits (very low to low evidence quality). One SR found significant reductions in hospitalizations and readmissions among higher-intensity medication reviews with face-to-face patient components. Another meta-analysis found a null effect. Of the 7 SRs without meta-analyses for hospitalizations and readmissions, all had predominantly null results. Two of 4 SRs found reductions in emergency department visits. Two SRs examined acceptability (very low evidence quality), finding wide variation in the adoption of polypharmacy-related interventions.Conclusions and relevanceThis updated systematic overview noted little evidence of an association between polypharmacy-related interventions and reduced important clinical and health care use outcomes. More evidence is needed regarding which interventions are most useful and which populations would benefit most.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 38198136 · DOI · PMC10782233

European position paper on polypharmacy and fall-risk-increasing drugs recommendations in the World Guidelines for Falls Prevention and Management: implications and implementation [3]

Research article van der Velde N, Seppala LJ, Hartikainen S, Kamkar N, Mallet L, Masud T, et al. · · 2023 · cited 31 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
Falls prevention and management in older adults is a critical global challenge.
Closing excerpt
For the future, it is important to focus on gaining which elements determine successful implementation and apply the concepts of implementation science to decrease the gap between research and practice.
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 (241 words)

Falls prevention and management in older adults is a critical global challenge. One of the key risk factors for falls is the use of certain medications. Therefore, to prevent medication-related falls, the following is recommended in the recent World Guidelines for Falls Prevention and Management: (1) assess for fall history and the risk of falls before prescribing potential fall-risk-increasing drugs (FRIDs), (2) use a validated, structured screening and assessment tool to identify FRIDs when performing a medication review, (3) include medication review and appropriate deprescribing of FRIDs as a part of the multifactorial falls prevention intervention, and (4) in long-term care residents, if multifactorial intervention cannot be conducted due to limited resources, the falls prevention strategy should still always include deprescribing of FRIDs.In the present statement paper, the working group on medication-related falls of the World Guidelines for Falls Prevention and Management, in collaboration with the European Geriatric Medicine Society (EuGMS) Task and Finish group on FRIDs, outlines its position on how to implement and execute these recommendations in clinical practice.Preferably, the medication review should be conducted as part of a comprehensive geriatric assessment to produce a personalized and patient-centered assessment. Furthermore, the major pitfall of the published intervention studies so far is the suboptimal implementation of medication review and deprescribing. For the future, it is important to focus on gaining which elements determine successful implementation and apply the concepts of implementation science to decrease the gap between research and practice.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 37452999 · DOI · PMC10447263

Nonlinear Associations Between Frailty and Medication Burden in Hospitalized Older Adults [4]

Research article Umegaki H, Nakashima H, Mizokami F, Yamada Y, Watanabe K, Fujisawa C, et al. · · 2026 · cited 6 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
AimTo examine how medication burden varies across frailty stages in hospitalized older adults, with a focus on potential nonlinear associations: METHODS: We analyzed a multicenter cohort of hospitalized adults aged ≥ 65 years.
Closing excerpt
These stage-dependent patterns suggest that moderate frailty may represent a window for targeted medication review and deprescribing, supporting frailty-stratified approaches to medication management in acute 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 (138 words)

AimTo examine how medication burden varies across frailty stages in hospitalized older adults, with a focus on potential nonlinear associations: METHODS: We analyzed a multicenter cohort of hospitalized adults aged ≥ 65 years. Frailty was assessed using the preadmission Clinical Frailty Scale (CFS). Associations between CFS and total medication count, potentially inappropriate medication (PIM) count, and anticholinergic burden (Japanese Anticholinergic Risk Scale) were evaluated using restricted cubic spline models adjusted for age, sex, and Charlson Comorbidity Index. Primary analyses were conducted in participants with complete data (n = 1075).ResultsCFS showed significant associations with all medication-related indicators (all overall p ConclusionsMedication burden is strongly and nonlinearly associated with frailty in hospitalized older adults. These stage-dependent patterns suggest that moderate frailty may represent a window for targeted medication review and deprescribing, supporting frailty-stratified approaches to medication management in acute care.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 42266173 · DOI · PMC13250668

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 What is polypharmacy? A systematic review of definitions [5]
    Masnoon N, Shakib S, Kalisch-Ellett L, Caughey GE · BMC Geriatr · 2017 · cited 2,180 times (Europe PMC)
  • Research article An update on the clinical consequences of polypharmacy in older adults: a narrative review [6]
    Wastesson JW, Morin L, Tan ECK, Johnell K · Expert Opin Drug Saf · 2018 · cited 386 times (Europe PMC)
  • Research article Adverse Outcomes of Polypharmacy in Older People: Systematic Review of Reviews [7]
    Davies LE, Spiers G, Kingston A, Todd A, Adamson J, Hanratty B · J Am Med Dir Assoc · 2020 · cited 365 times (Europe PMC)
  • Research article The relationship between frailty and polypharmacy in older people: A systematic review [8]
    Gutiérrez-Valencia M, Izquierdo M, Cesari M, Casas-Herrero Á, Inzitari M, Martínez-Velilla N · Br J Clin Pharmacol · 2018 · cited 331 times (Europe PMC)
  • Research article Polypharmacy in older adults: a narrative review of definitions, epidemiology and consequences [9]
    Pazan F, Wehling M · Eur Geriatr Med · 2021 · cited 314 times (Europe PMC)
  • Research article Polypharmacology: drug discovery for the future [10]
    Reddy AS, Zhang S · Expert Rev Clin Pharmacol · 2013 · cited 308 times (Europe PMC)

References

  1. Wang X, Liu K, Shirai K, Tang C, Hu Y, Wang Y, et al.. Prevalence and trends of polypharmacy in U.S. adults, 1999-2018. . 2023. PMID 37434230 · DOI · PMC10337167
  2. Keller MS, Qureshi N, Mays AM, Sarkisian CA, Pevnick JM. Cumulative Update of a Systematic Overview Evaluating Interventions Addressing Polypharmacy. . 2024. PMID 38198136 · DOI · PMC10782233
  3. van der Velde N, Seppala LJ, Hartikainen S, Kamkar N, Mallet L, Masud T, et al.. European position paper on polypharmacy and fall-risk-increasing drugs recommendations in the World Guidelines for Falls Prevention and Management: implications and implementation. . 2023. PMID 37452999 · DOI · PMC10447263
  4. Umegaki H, Nakashima H, Mizokami F, Yamada Y, Watanabe K, Fujisawa C, et al.. Nonlinear Associations Between Frailty and Medication Burden in Hospitalized Older Adults. . 2026. PMID 42266173 · DOI · PMC13250668
  5. Masnoon N, Shakib S, Kalisch-Ellett L, Caughey GE. What is polypharmacy? A systematic review of definitions. BMC Geriatr. 2017. PMID 29017448 · DOI · PMC5635569
  6. Wastesson JW, Morin L, Tan ECK, Johnell K. An update on the clinical consequences of polypharmacy in older adults: a narrative review. Expert Opin Drug Saf. 2018. PMID 30540223 · DOI
  7. Davies LE, Spiers G, Kingston A, Todd A, Adamson J, Hanratty B. Adverse Outcomes of Polypharmacy in Older People: Systematic Review of Reviews. J Am Med Dir Assoc. 2020. PMID 31926797 · DOI
  8. Gutiérrez-Valencia M, Izquierdo M, Cesari M, Casas-Herrero Á, Inzitari M, Martínez-Velilla N. The relationship between frailty and polypharmacy in older people: A systematic review. Br J Clin Pharmacol. 2018. PMID 29575094 · DOI · PMC6005607
  9. Pazan F, Wehling M. Polypharmacy in older adults: a narrative review of definitions, epidemiology and consequences. Eur Geriatr Med. 2021. PMID 33694123 · DOI · PMC8149355
  10. Reddy AS, Zhang S. Polypharmacology: drug discovery for the future. Expert Rev Clin Pharmacol. 2013. PMID 23272792 · DOI · PMC3809828

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 2026-10-31; title, year and DOI matched.
Review state
automated source verified; no human expert review has been recorded yet.
Version
1, last updated 2026-10-29.

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At a glance

8,337
PubMed records on this heading
40%
published since 2020
1,495
review articles
304
randomized trials
10
verified references below

Counts come from PubMed on 2026-10-29; they show how much has been written, not how strong the evidence is.

Related topics See all →

  • Drug CombinationsDrugs and Chemicals
  • Patient SatisfactionClinical Research
  • Drug TherapyPharmacology
  • Chelation TherapyPharmacology
  • Drug CarriersPharmacology

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