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OtherPractice

Incidence of iatrogenic opioid use disorder

Samantha Moe, Jessica Kirkwood and G. Michael Allan
Canadian Family Physician October 2019; 65 (10) 724;
Samantha Moe
Clinical Evidence Expert for the College of Family Physicians of Canada in Mississauga, Ont.
PharmD
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Jessica Kirkwood
Family physician at the Boyle McCauley Health Centre in Edmonton, Alta.
MD CCFP(AM)
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G. Michael Allan
Director of Programs and Practice Support for the College of Family Physicians of Canada and Professor in the Department of Family Medicine at the University of Alberta in Edmonton.
MD CCFP
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Clinical question

What is the risk of developing opioid use disorder (OUD) when taking prescription opioids?

Bottom line

Incidence of OUD associated with prescribed opioids in chronic pain patients is likely about 3% (over 2 years) but causation is uncertain. Patients with no history of substance use disorder (SUD) appear to be at lower risk (< 1%). Factors associated with increased risk include history of SUD and receiving opioids for longer (> 90 days) or at higher doses (> 120 mg/d morphine equivalent [ME]).

Evidence

A systematic review1 (12 studies, N = 310 408) of patients with pain prescribed opioid therapy (≥ 7 days; 97% for ≥ 3 months) found the following.

  • Incidence of opioid dependence or “abuse” was 3.1% in the higher-quality studies and 4.7% including all studies.

  • Diagnostic criteria matter: incidence varies (from 1% to 11%) based on diagnostic criteria.

A systematic review2 (24 studies, N = 2507) of patients with chronic pain prescribed opioid therapy (average exposure 26 months, range 2 to 240 months) found the following.

  • Incidence of opioid addiction was 3.3%.

    • - Incidence was 0.2% in patients without a history of “substance abuse/addiction” versus 5% with positive history.

  • Limitations: varying addiction definitions; quality of studies included (retrospective [71%], prospective and randomized [29%]); unclear pooling technique.

Two systematic reviews3,4 found incidences of 0.3% to 0.5%, but in patients who were generally lower risk.

Context

  • Incidence (new cases after opioid prescription) might better estimate iatrogenic OUD than prevalence (all OUD patients, including those prescribed opioids after developing OUD).2

  • Prevalence of OUD ranges from 0.05% to 23%.3,5,6

    • -The variation is attributable to differing study quality, variable diagnostic criteria and terminology, inconsistent reporting, and the populations studied.

  • Most included studies (using terms like addiction or substance abuse) were published before the DSM-5 criteria.

  • Exposure to prescription opioids in adolescents and young adults was associated with future nonmedical prescription opioid use7 and OUD.8

  • One insurance database cohort study9 (N = 568 640) found after 12 months that for doses of 36 to 120 mg/d ME, OUD incidence with acute use (1 to 90 days) was 0.12% versus 1.3% with chronic use (> 90 days). For prescriptions of more than 90 days, OUD incidence with 1 to 36 mg/d ME was 0.7% versus 6.1% with more than 120 mg/d ME.

Implementation

Opioids are frequently not superior to other medications for acute10 or chronic pain11 and have high (about 23%) discontinuation due to adverse events.3 If considering opioids, assess possible risk factors for OUD, particularly previous SUD. If prescribing, consider shorter prescriptions, lower doses and potency, and smaller amounts. Urine toxicology can help verify the patient is taking the provided prescription. If refilling chronic opioid prescriptions, consider screening for OUD with simple tools like the Prescription Opioid Misuse Index and consult appropriate guidelines as needed.12

Notes

Tools for Practice articles in Canadian Family Physician are adapted from articles published on the Alberta College of Family Physicians (ACFP) website, summarizing medical evidence with a focus on topical issues and practice-modifying information. The ACFP summaries and the series in Canadian Family Physician are coordinated by Dr G. Michael Allan, and the summaries are co-authored by at least 1 practising family physician and are peer reviewed. Feedback is welcome and can be sent to toolsforpractice{at}cfpc.ca. Archived articles are available on the ACFP website: www.acfp.ca.

Footnotes

  • Competing interests

    None declared

  • The opinions expressed in Tools for Practice articles are those of the authors and do not necessarily mirror the perspective and policy of the Alberta College of Family Physicians.

  • This article is eligible for Mainpro+ certified Self-Learning credits. To earn credits, go to www.cfp.ca and click on the Mainpro+ link.

  • La traduction en français de cet article se trouve à www.cfp.ca dans la table des matières du numéro d’octobre 2019 à la page e431.

  • Copyright© the College of Family Physicians of Canada

References

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    1. Edlund MJ,
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    1. Chang AK,
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    . Managing opioid use disorder in primary care. PEER simplified guideline. Can Fam Physician 2019;65:321-30. (Eng), e173–84 (Fr).
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Canadian Family Physician: 65 (10)
Canadian Family Physician
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Incidence of iatrogenic opioid use disorder
Samantha Moe, Jessica Kirkwood, G. Michael Allan
Canadian Family Physician Oct 2019, 65 (10) 724;

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