Evidence map›Paper›PMID 39298168›Full record

SynthesisJAMA network open2024

Long-Term Use of Muscle Relaxant Medications for Chronic Pain: A Systematic Review.

Benjamin J Oldfield, Brynna Gleeson, Kenneth L Morford, Zoe Adams, Melissa C Funaro, William C Becker, Jessica S Merlin

Abstract readSystematic Review
In one paragraph

Synthesis in JAMA network open, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 16 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
16citing papers in PubMed, 2 pooled it
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

16 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Pooled it
  2. Pooled it
  3. Review
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  5. Article
  6. Article
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  8. Article
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  11. Article
  12. Observational
  13. Article
  14. Relationships between psoas muscle index, lumbar lordosis, and chronic low back pain in middle-aged and elderly people.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2025
    Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors.

Benjamin J OldfieldProgram in Addiction Medicine, Department of Medicine, Yale School of Medicine, New Haven, Connecticut.
Brynna GleesonVirginia Tech Carilion School of Medicine, Roanoke.
Kenneth L MorfordProgram in Addiction Medicine, Department of Medicine, Yale School of Medicine, New Haven, Connecticut.
Zoe AdamsDepartment of Medicine, Massachusetts General Hospital, Boston.
Melissa C FunaroHarvey Cushing/John Hay Whitney Medical Library, Yale University, New Haven, Connecticut.
William C BeckerProgram in Addiction Medicine, Department of Medicine, Yale School of Medicine, New Haven, Connecticut.
Jessica S MerlinChallenges in Managing and Preventing Pain Clinical Research Center, University of Pittsburgh, Pittsburgh, Pennsylvania.

Funding

Yale Clinical and Translational Science Award (U Component)UL1TR001863 · NCATS · YALE UNIVERSITY · PI John H. Krystal, LUCILA OHNO-MACHADO · 2016 to 2026
$102.9M
Mentoring the next generation of researchers at the intersection of opioid use disorder and chronic painK24DA056837 · NIDA · UNIVERSITY OF PITTSBURGH AT PITTSBURGH · PI Megan Hamm, Jessica S Merlin · 2023 to 2026
$771k
NCATS NIH HHS UL1 TR001863NIDA NIH HHS K24 DA056837
6 · The paper itself

Abstract

Importance: Stricter opioid prescribing guidelines have increased prescriptions of skeletal muscle relaxants (SMRs) for chronic pain, but the efficacy of long-term use of SMRs for chronic pain is unknown. Objective: To systematically review the effectiveness or efficacy of long-term use of SMRs for chronic pain. Evidence Review: Two reviewers systematically searched Ovid MEDLINE, Embase (Ovid), Web of Science, CINAHL, and Cochrane through December 4, 2023. They included articles published in English, Spanish, or Italian. Only randomized clinical trials (RCTs) and cohort studies with comparator groups evaluating at least 1-month duration of SMRs for chronic pain were included. The reviewers dually reviewed data abstraction, risk-of-bias, and quality. They characterized studies by chronic pain syndrome: low back pain, fibromyalgia, headaches, painful cramps or spasticity, and other syndromes. Findings: A total of 30 RCTs with 1314 participants and 14 cohort studies with 1168 participants assessed SMRs for chronic pain. Studies were primarily short-term (4-6 weeks). Nine unique SMRs were represented by the studies identified. Eleven studies (25%) examined baclofen, 8 (18%) examined tizanidine, and 7 (16%) examined cyclobenzaprine. Evidence for effectiveness was strongest for SMRs used for trigeminal neuralgia, neck pain, and painful cramps; evidence suggested SMRs for fibromyalgia, low back pain, and other syndromes were not more beneficial than placebo. The most common adverse effects were sedation and dry mouth. RCTs had a low to moderate risk of bias, and the quality of cohort studies was fair to good. Conclusions and Relevance: In this systematic review of long-term use of SMRs for chronic pain, findings suggest that their long-term use may benefit patients with painful spasms or cramps and neck pain; their long-term use for low back pain, fibromyalgia, and headaches did not appear to be beneficial. Clinicians should be vigilant for adverse effects and consider deprescribing if pain-related goals are not met.

Indexed as

Chronic PainHumansMuscle Relaxants, CentralMuscle Relaxants, Central

Identifiers

PMID39298168
PMCPMC11413720

What OpenQuestion holds

Textmetadata
LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.