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CME Article

National Trends in Antidepressant, Benzodiazepine, and Other Sedative-Hypnotic Treatment of Older Adults in Psychiatric and Primary Care

National Trends in Antidepressant, Benzodiazepine, and Other Sedative-Hypnotic Treatment of Older Adults in Psychiatric and Primary Care

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ABSTRACT

Objective: To describe how use of antidepressants, benzodiazepines, and other anxiolytic/sedative-hypnotics among older adults (age 65 years) has changed over time among visits to primary care providers and psychiatrists.

Methods: Data were from the National Ambulatory Medical Care Survey (years 2003-2005 and 2010-2012), a nationally representative cross-section of outpatient physician visits. Analysis focused on visits to primary care providers (n = 14,282) and psychiatrists (n = 1,095) at which an antidepressant, benzodiazepine, or other anxiolytic/sedative-hypnotic was prescribed, which were stratified by demographic and clinical characteristic (including ICD-9-CM diagnosis) and compared across study intervals. Odds of medication use were calculated for each stratum, adjusting for demographic and clinical characteristics.

Results: The visit rate by older adults to primary care providers where any of the medications were prescribed rose from 16.4% to 21.8% (adjusted odds ratio [AOR] = 1.43, P < .001) while remaining steady among psychiatrists (75.4% vs 68.5%; AOR = 0.69, P = .11). Primary care visits rose for antidepressants (9.9% to 12.3%; AOR = 1.28, P = .01) and other anxiolytic/sedative-hypnotics (3.4% to 4.7%; AOR = 1.39, P = .01), but the largest growth was among benzodiazepines (5.6% to 8.7%; AOR = 1.62, P < .001). Among patients in primary care, increases primarily occurred among men, non-Hispanic white patients, and those with pain diagnoses as well as those with no mental health or pain diagnoses.

Conclusions: From 2003 to 2012, use of the most common psychotropic medications among older adults seen in primary care increased, with concentration among patients with no mental health or pain diagnosis. As the population of older adults grows and receives mental health treatment in primary care, it is critical to examine the appropriateness of psychotropic use.

J Clin Psychiatry 2017;78(4):e363-e371

https://doi.org/10.4088/JCP.16m10713

aDepartment of Psychiatry and Institute for Healthcare Policy and Innovation, University of Michigan, Ann Arbor, and Center for Clinical Management Research, VA Ann Arbor Healthcare System, Michigan

bNortheast Program Evaluation Center, Office of Mental Health Operations, US Department of Veterans Affairs, West Haven, Connecticut, and Department of Psychiatry, Yale School of Medicine, New Haven, Connecticut

cSchool of Social Policy and Practice, University of Pennsylvania, Philadelphia

*Corresponding author: Donovan T. Maust, MD, MS, Department of Psychiatry, University of Michigan, NCRC 016-222W, 2800 Plymouth Rd, Ann Arbor, MI 48109 (maustd@umich.edu).

The Institute of Medicine released The Mental Health and Substance Use Workforce for Older Adults: In Whose Hands?1 in 2012, the year after the first Baby Boomers turned 65. The report highlights the lack of providers with expertise to address the mental health needs of older adults, especially given the burden of mental disorders in this growing population.2,3 The limited workforce of specialty-trained mental health providers and patient preference may help account for the fact that the principal mental health treatment setting for older adults is primary care4 and the first-line treatment modality is overwhelmingly psychotropic medication,5 despite a variety of effective evidence-based psychotherapies.6

Antidepressants, benzodiazepines, and other anxiolytic/sedative-hypnotics are the psychotropic medications most commonly prescribed to older adults,7 and understanding change in their use among this growing population is important, especially in light of potential harms associated with use. Since its inception, the Beers Criteria has listed a variety of psychotropic medications as inappropriate for older adults,8 with the current version listing nearly every one as potentially inappropriate.9 Benzodiazepines in particular have long been associated with harms in older adults, including falls,10 fractures,11 and motor vehicle accidents.12 Other sedative-hypnotics are associated with similar problems,13 and even selective serotonin reuptake inhibitors (SSRIs) are associated with gastrointestinal bleeding.14 All of these medications adversely impact cognition,13,15-17 while benzodiazepines are possibly associated with incident dementia,18 though evidence is mixed.19 These potential harms for older adults are particularly concerning given growing evidence that much psychotropic prescribing occurs in the absence of significant symptoms20 or a clearly defined mental disorder.21,22

While evidence of adverse effects accumulates, less is known about whether and how psychotropic use has changed specifically among older adults in the United States. The most recent analyses of national trends in depression treatment23 and antidepressant use24 found no change among adults 65 years but are from data nearly 10 years old. A study of Medicare beneficiaries from 1992 to 2005 demonstrated an increase in antidepressant use,25 though this study interval was wide enough to include the introduction and uptake of the new, safer nontricyclic antidepressants.26 Another analysis found an increase in sedative-hypnotic use from 1993 to 2007 but did not stratify by age.27 A recent cross-sectional analysis of 2008 data showed that benzodiazepine use is highest among older adults,28 while another study showed that visits with benzodiazepines and non-benzodiazepine receptor agonists have increased through 2010, including among older adults, though they were not the focus of analysis.29

We used data from the National Ambulatory Medical Care Survey (NAMCS), a representative survey of visits to all office-based physicians in the United States, to explore trends in use of the most commonly prescribed psychotropic medications among older adults: antidepressants, benzodiazepines, and other anxiolytics/sedative-hypnotics.7 Our focus was on primary care providers, who prescribe the majority of these medications, and psychiatrists to understand whether use has changed over time and whether this change is concentrated among demographic or clinical subpopulations.

clinical points

  • Psychotropic use overall has been increasing, including among older adults, but it is unclear whether this is concentrated among certain demographic or clinical subpopulations.
  • Increases in use of antidepressants, benzodiazepines, and other sedative-hypnotics are concentrated among men, patients with pain, and patients with no mental health diagnosis.
  • For older adults with minimal symptoms, it is important to consider whether an alternative psychosocial intervention might be more appropriate and safer than medication.

METHODS

Sample

The analyses use data from NAMCS, years 2003-2005 and 2010-2012 (2012 is the most recent year available). NAMCS is a national probability sample survey of office-based and community health center-based physicians designed to "provide objective, reliable information about the provision and use of ambulatory medical care services in the United States."30 Physicians are sampled from the American Medical Association and American Osteopathic Association master files; physicians in anesthesiology, pathology, and radiology are excluded. Encounters such as house calls or those to institutional settings (eg, nursing homes) are not included.

Each physician is assigned a 1-week reporting period, with data collected from a random sample of visits during that week. For survey years prior to 2012, data for selected visits were recorded on a standardized form by the physician, their office staff, or field representatives of the US Census Bureau. Beginning in 2012, NAMCS implemented computer-assisted data collection, which was performed primarily by Census staff.31 The average physician response rate for the study years was 57.5%, yielding a total of 214,670 patient encounters from visits to 10,532 physicians. The 2012 NAMCS public use data file currently available does not include visits to community health centers; therefore, such visits from other years were excluded from analysis, as recommended by NAMCS.31 The current analysis was limited to visits by patients ≥ 65 years to primary care providers and psychiatrists (14,282 and 1,095 visits, respectively). NAMCS data and related documentation are available from the National Center for Health Statistics (http://www.cdc.gov/nchs/ahcd/about_ahcd.htm).

Medications and Diagnoses

Survey data include up to 8 medications prescribed, ordered, supplied, administered, or continued during each visit. The 2012 survey includes up to 10 medications, but it was limited for analysis to the first 8 reported to be consistent with earlier years. Medications reported in NAMCS are assigned to therapeutic classes according to Lexicon Plus, a proprietary database of Cerner Multum, Inc,31 with the following classes used for analysis: antidepressants, benzodiazepines, and miscellaneous anxiolytic/sedative-hypnotics (sedative-hypnotic hereafter), which includes the non-benzodiazepine receptor agonists. Using the Lexicon Plus classification system, antidepressants were further subdivided into the following 3 subclasses: (1) SSRIs, (2) tricyclic antidepressants and monoamine oxidase inhibitors, and (3) other. Benzodiazepines were subdivided into short- and long-acting.28 The medication classes assigned to each patient visit were not mutually exclusive (eg, a patient using sertraline and lorazepam was included in both the antidepressant and benzodiazepine analyses).

At each encounter, up to 3 diagnoses are recorded based on what the provider identified as the primary visit diagnoses (using the International Classification of Disease, Ninth Revision, Clinical Modification [ICD-9-CM]). We classified encounters that were for depression, anxiety, insomnia, dementia, and non-cancer pain, the diagnoses most likely associated with the psychotropic classes of interest. A given visit could include any of the diagnoses of interest; categories were not mutually exclusive.

Other Patient, Visit, and Provider Characteristics

In addition to medication and diagnoses, we include patient age, sex, and race/ethnicity, which are known to be associated with psychotropic use.5,32 NAMCS classifies providers into 15 specialty groups. Analysis was limited to primary care providers (family medicine and internal medicine) and psychiatrists. The following additional visit-related variables were included: (1) whether psychotherapy was provided or ordered and (2) whether stress management health education or other mental health counseling was provided or ordered.

Statistical Methods

We grouped survey years (2003-2005 and 2010-2012) as recommended by NAMCS to produce more reliable annual visit rate estimates.33 Clinical and demographic characteristics for all visits were compared across the time period using χ2 tests. Analyses were adjusted using survey design elements for visit weight, clustering within physician practice, and stratification to allow national inferences.31

We generated national visit rate estimates by provider type for the 3 medication classes during each time period. We tested a time × specialty interaction to determine whether the change in medication visit rate, if present, differed by specialty. Then, for each medication and specialty, we used logistic regression models stratified by demographic and clinical characteristics to explore how medication use changed for specific patient subpopulations. Among antidepressant users and benzodiazepine users, we also examined whether use of specific medication classes (eg, SSRIs or long-acting benzodiazepines) changed. All regression models were adjusted for age, gender, race/ethnicity, and clinical diagnosis to account for changes over time.

Analyses were conducted in Stata 13.1 (College Station, Texas) using 2-sided tests with α = .05.

RESULTS

Among all visits to primary care providers across the study period (Table 1), there was an increase in both the proportion of visits by the young old (65-74 years) as well as the oldest old (≥ 85 years). Psychiatrists saw an increase in visits by the young old. The proportion of male primary care visits increased but was unchanged among psychiatrists. The race/ethnicity balance of visits to primary care providers was unchanged, while visits by non-Hispanic white patients to psychiatrists dropped and visits by Hispanic patients increased. Visits for insomnia and dementia to primary care providers increased; among psychiatrists, there was an increase in insomnia visits.

Table 1

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The overall rate of visits by older adults to primary care including an antidepressant, benzodiazepine, or other sedative-hypnotic rose from 16.4% (95% CI, 14.7%-18.3%) to 21.8% (95% CI, 20.1%-23.6%; adjusted odds ratio [AOR] = 1.43 [95% CI, 1.22-1.69], P < .001). The proportion of such visits to psychiatrists dropped but was not statistically significant (75.4% [95% CI, 69.6%-80.4%] vs 68.5% [95% CI, 62.0%-74.3%]; AOR = 0.69 [95% CI, 0.43-1.08], P = .11).

The odds of an antidepressant visit (Table 2) to primary care providers increased overall but dropped among psychiatrists; the interaction test for the trend across time by specialty was significant. In stratified analyses of primary care visits, increases occurred largely among visits by the middle old (75-84 years), men, non-Hispanic white patients, and those with pain diagnoses, but also those with no mental health or pain diagnosis. The decline among visits to psychiatrists was among the oldest group and women, as well as those with depression and anxiety disorders. There were no significant changes in use of any antidepressant subclass by either specialty (Table 3).

Table 2

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Table 3

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The odds of benzodiazepine use (Table 4) increased among visits to primary care providers but were unchanged among psychiatrists. Among primary care providers, the odds increased across most demographic strata, with the largest increase among men. The odds of benzodiazepine use increased among both those with pain disorders and those with no mental health or pain disorder diagnosed. Among visits to psychiatrists, the only stratum where the odds changed was among visits for anxiety disorders, where benzodiazepine use decreased. Use of long-acting benzodiazepines in primary care declined, though there was a sufficiently large increase in short-acting agents to drive the overall increase (Table 3).

Table 4

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Other sedative-hypnotic use (Table 5) also increased among primary care providers and was unchanged among psychiatrists. The increase among primary care providers was generally limited to the young old and non-Hispanic white patients. As with antidepressants and benzodiazepines, use increased among those with no mental health or pain diagnosis.

Table 5

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DISCUSSION

This analysis of nationally representative data of physician visits by older adults demonstrates that use of each of the 3 psychotropic classes increased in primary care from 2003 to 2012. While use overall was highest among antidepressants, benzodiazepine visits increased the most, from 5.6% to 8.7% of visits. In contrast, psychotropic visit rates to psychiatrists remained relatively steady and even declined for antidepressants. These overall results are consistent with demonstrated increases in antidepressant and benzodiazepine prescribing in a variety of international settings.34-37

What accounts for these increases in primary care? First, they may reflect expanding use of psychotropic medication beyond that for specific mental health diagnoses: the clinical subpopulation for which use of all medication groups increased was in those with no mental health or pain diagnosis. While prior work has demonstrated use of psychotropic medication in the absence of clearly defined mental disorders,20,21,38-40 ours is the first to demonstrate that such use has increased over time in the United States. In a recent analysis of the Health and Retirement Study, Soldo et al found that, relative to previous cohorts, Baby Boomers approaching retirement reported they have "more difficulty with a range of everyday physical tasks, [but also report] more pain, more chronic conditions, [and] more drinking and psychiatric problems."41(p17) In light of this work, a possible interpretation of our results is that newer cohorts of older adults have additional aging-associated distress, leading to increased nonspecific use of psychotropic medication in an attempt to address these concerns. This expansion beyond clearly defined mental disorders is concerning, as there is limited evidence of benefit from such nonspecific use, while the risk of harms in older adults remains.

Second, public attitudes have grown more favorable toward the use of psychotropic medication,42 with older adults more open to mental health treatment than previous cohorts.43 However, since older patients prefer to be seen in primary care44 and may have limited access to specialty mental health care,45 it follows that an increase in psychotropic use would be realized in the primary care setting.

Our finding that antidepressant and benzodiazepine use increased among those with a pain diagnosis suggests the emphasis on pain as the "fifth vital sign"46 may have had an impact beyond opioid prescribing.47,48 Previous work by Olfson and Marcus24 demonstrated a pain-associated increase in antidepressant use in the general adult population through 2005, but to our knowledge this is the first analysis to demonstrate an increase in benzodiazepines associated with pain. This is particularly concerning if these patients are coprescribed opioids in light of the role of benzodiazepines in opioid overdose.15,49

Finally, increased medication use may be a legacy of direct-to-consumer advertising. An early randomized controlled trial that studied the effects of brand-specific medication requests used standardized patients with either major depressive disorder or an adjustment disorder with depressed mood presenting to primary care physicians.50 Prescribing was higher for both conditions when standardized patients requested medication. More concerning, physicians were as likely to respond to a request for a specific brand-name medication from patients with adjustment disorders as patients with major depression, even though antidepressants are not effective for adjustment disorders. The SSRIs were subject to extensive advertising until they went off-patent around the start of the analytic time period, meaning that patients were quite likely familiar with and could request specific medications. Among the sedative-hypnotics, several new medications were introduced during the study period (eg, eszopiclone and ramelteon), which, combined with a marketing push from the pharmaceutical industry,51 may have created increased demand.

Neither advertising nor new products explain the increased use of benzodiazepines, which have been available for decades, but with evidence of adverse events for nearly as long,52,53 which only grew leading up to and during the study period.10,13,54,55 It is notable, however, that we found that primary care providers have shifted from long- to short-acting benzodiazepines, which may reflect provider attempts at harm reduction given evidence suggesting that shorter-acting agents are not associated with a fall risk.53 However, subsequent analyses early in the study period demonstrated that the risk extends to all benzodiazepines.11,54 Our findings do differ from a recent analysis including NAMCS that found no recent increase in benzodiazepine use among older adults.56 However, this analysis was limited to specific visit reasons or diagnoses (eg, anxiety or back sprain) that the authors hypothesized might prompt a benzodiazepine prescription. Our analysis found that the increase in benzodiazepine prescribing occurred among older adults without such diagnoses.

Among all ages23—and older adults in particular5—women account for a larger share of mental health treatment. However, psychotropic use among men in primary care rose for every medication except sedative-hypnotics. In addition, the odds of use over time for every medication class were larger among men than women. It is possible that as attitudes toward mental health care have changed,42 men are increasingly willing to use psychotropic medication, whereas women experience a ceiling effect with less room for additional use.

It is notable that antidepressant use decreased among visits to psychiatrists. Given the emphasis on detection and treatment of depression in primary care, growing comfort with newer antidepressants, and limited availability of psychiatrists, primary care providers may be delivering more care and referring fewer of these patients to psychiatrists. The drop in use of antidepressants, benzodiazepines, and sedative-hypnotics specifically among patients with anxiety disorders may be a result of increased use of atypical antipsychotics for this subpopulation.57 Otherwise, the use of psychotropic medications among psychiatrists was largely unchanged. While public attitudes have become more accepting of psychotropic medications, older adults that were willing to see a psychiatrist at any point during the 2003-2012 study period were quite likely always willing to take psychotropic medication.

Finally, it is important to note that these psychotropic increases have occurred in the context of an overall increase in the use of prescription medication among all ages recently described by Kantor et al using the National Health and Nutrition Examination Survey.58 The authors suggest that enactment of Medicare Part D may have facilitated this increase through improved access to medication, which has been demonstrated with antidepressant use59,60 but with unclear impact on benzodiazepine use given the Part D benzodiazepine coverage exclusion.61,62 Kantor et al also suggest direct-to-consumer advertising as a possible cause for increase, as discussed above, as well as the increased need to treat obesity-related complications, which is a less likely cause of increased psychotropic use.

Our work has several limitations. Patient-level clinical assessments of current symptoms and function are not available, nor outcomes associated with medication use. NAMCS does not account for whether a prescribed medication is taken regularly versus as needed, so it is possible that the extent of regular use is overestimated. The relatively small number of respondents in particular strata limits the reliability of some estimates. Because NAMCS is a survey of office-based practice, it does not include physicians practicing in other settings. While physician nonresponse might introduce bias into the results, the survey weights designed by NAMCS account for this to produce unbiased national estimates.31 Finally, in 2012, NAMCS began using Census Field Representatives rather than physician office staff to conduct data collection. NAMCS reports that these changes did not affect diagnosis results, while the number of medications reported did decrease, for which National Center for Health Statistics staff "have researched…[all] possible contributing factors" 31(p6) without clear explanation. This suggests that our results may potentially underestimate the increases seen.

These nationally representative analyses are, to our knowledge, the first to describe and characterize an increase in use of psychotropic medication among older adults in the United States. The growth appears to be limited to primary care settings and occurs primarily among patients with pain or otherwise without clearly defined mental disorders, as well as among men. These increases suggest that patients in distress are seeking treatment and, given growing public acceptance of psychotropic use, are increasingly willing to consider psychotropic medication. Prior analyses have suggested that such prescribing may be in response to mild or subsyndromal symptoms22; many of these patients may in fact benefit from treatment and engagement with their providers. However, there is little evidence that psychotropic treatment helps with subsyndromal or mild symptoms,63,64 while the risk of harm remains constant regardless of the potential for benefit.65 It is of critical public health significance to address the appropriateness of psychotropic prescribing among older adults, as well as provide additional support to primary care providers to assist with diagnosis and treatment.

Submitted: February 1, 2016; accepted August 12, 2016.

Disclosure of off-label usage: The authors have determined that, to the best of their knowledge, no investigational information about pharmaceutical agents that is outside US Food and Drug Administration-approved labeling has been presented in this article.

Financial disclosure: Dr Marcus reports receipt of consulting fees from Alkermes, Shire, Johnson & Johnson, Forest, and Sunovion. Drs Maust, Blow, Wiechers, and Kales have no personal affiliations or financial relationships with any commercial interest to disclose relative to the article.

Funding/support: Dr Maust was supported by the Beeson Career Development Award Program (NIA K08AG048321, AFAR, The John A. Hartford Foundation, and The Atlantic Philanthropies).

Role of the sponsor: The funders had no role in the design, analysis, interpretation, or publication of this study.

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