Importance: The Centers for Disease Control and Prevention guidelines in 2016 recommended avoiding concurrent use of opioids and benzodiazepines. Objective: To determine whether the release of the guidelines was associated with changes in coprescription of opioids and benzodiazepines. Design, Setting, and Participants: This retrospective cohort study used claims data obtained from a US national database of medical and pharmacy claims for 3598322 adult commercially insured patients and 1299142 Medicare Advantage (MA) beneficiaries with no recent history of cancer, sickle cell disease, or hospice care who ever used prescribed opioids during the study period, January 1, 2014, through March 31, 2018. Exposures: Overlapping opioid and benzodiazepine prescriptions filled. Main Outcomes and Measures: The extent (proportion of person-months with any overlapping days of prescription of opioids and benzodiazepines) and intensity (proportion of days with opioids prescribed where benzodiazepines were also available) of coprescription. Results: Of 4897464 patients (with 13.4 million person-months of opioid use), the total number of unique commercially insured individuals was 3598322 (1974731 women [54.9%]), and the total number of unique MA beneficiaries was 1299142 (770256 women [59.3%]). Among 128576 participants experiencing chronic pain episodes, more than one-half of person-months of long-term opioid use occurred in women (52.7% of person-months among those with commercial insurance and 62.4% of person-months among MA beneficiaries). The median (interquartile range) age of the participants was 51 (41-58) years for patients in the commercial insurance group and 70 (61-77) years for those in the MA group. The mean (SE) extent of coprescription was 23.0% (0.18%) for the commercial insurance group and 25.7% (0.18%) for the MA group. The extent of coprescription decreased in the targeted guideline population - individuals with long-term opioid use - after the guideline release (postguideline slope, -0.95 percentages point per year [95% CI, -1.44 to -0.46 percentage points per year] for the commercial insurance group and -1.06 percentage points per year [95% CI, -1.49 to -0.63 percentage points per year] for the MA group). Nontargeted short-term episodes of opioid use were associated with no change or small declines in trend (for the MA group, postguideline slope of 0.47 percentage point per year [95% CI, 0.35-0.59 percentage point per year]; for the commercial insurance group, postguideline slope of -0.05 percentage point per year [95% CI, -0.12 to 0.02 percentage point per year]). High coprescribing intensity was seen, with 79.3% (95% CI, 78.9%-79.6%) of opioid prescription days in the commercial insurance group and 83.9% (95% CI, 83.7%-84.2%) in the MA group overlapping with benzodiazepines. There was no change in the intensity of coprescribing. Intensity of coprescription was higher when the same clinician prescribed opioids and benzodiazepines. Conclusion and Relevance: This study observed a reduction in the extent but not intensity of coprescribing of benzodiazepines for patients with long-term opioid use..
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