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Figure.  Predicted Estimates of Medication Purchase Outside the US
Predicted Estimates of Medication Purchase Outside the US

Predicted estimates were generated from the multivariable logistic regression models including age, sex, race/ethnicity, immigration status, marital status, employment status, educational level, family income level, census region, type of insurance, self-reported health status, and the number of comorbidities. COPD indicates chronic obstructive pulmonary disease; CVD, cardiovascular disease.

Table 1.  Estimated Prevalence and Factors Associated With Medication Purchase Outside the US Among US Adults Taking Prescription Medications by Socioeconomic and Health Characteristics
Estimated Prevalence and Factors Associated With Medication Purchase Outside the US Among US Adults Taking Prescription Medications by Socioeconomic and Health Characteristics
Table 2.  Estimated Prevalence and Factors Associated With Medication Purchase Outside the US Among US Adults Taking Prescription Medications by Internet Use and Medication-Taking Behaviors
Estimated Prevalence and Factors Associated With Medication Purchase Outside the US Among US Adults Taking Prescription Medications by Internet Use and Medication-Taking Behaviors
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Thomas  K. Trump administration takes first step to allow drug imports from Canada. The New York Times. Published 2019. Accessed January 28, 2020. https://www.nytimes.com/2019/12/18/health/drug-prices-imports-canada.html
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US Food and Drug Administration. Importation of certain FDA-approved human prescription drugs, including biological products, under section 801(d)(1)(B) of the Federal Food, Drug, and Cosmetic Act. Published 2019. Accessed January 28, 2020. https://www.fda.gov/regulatory-information/search-fda-guidance-documents/importation-certain-fda-approved-human-prescription-drugs-including-biological-products-under
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Calvillo  JP, Lal  L.  Pilot study of a survey of US residents purchasing medications in Mexico: demographics, reasons, and types of medications purchased.   Clin Ther. 2003;25(2):561-577. doi:10.1016/S0149-2918(03)80097-8 PubMedGoogle ScholarCrossref
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Brown  MT, Bussell  JK.  Medication adherence: WHO cares?   Mayo Clin Proc. 2011;86(4):304-314. doi:10.4065/mcp.2010.0575 PubMedGoogle ScholarCrossref
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Chung  GC, Marottoli  RA, Cooney  LM  Jr, Rhee  TG.  Cost-related medication nonadherence among older adults: findings from a nationally representative sample.   J Am Geriatr Soc. 2019;67(12):2463-2473. doi:10.1111/jgs.16141 PubMedGoogle ScholarCrossref
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National Center for Health Statistics. National Health Interview Survey. Published 2020. Accessed November 15, 2019. https://www.cdc.gov/nchs/nhis/index.htm
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von Elm  E, Altman  DG, Egger  M, Pocock  SJ, Gøtzsche  PC, Vandenbroucke  JP; STROBE Initiative.  The Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) statement: guidelines for reporting observational studies.   J Clin Epidemiol. 2008;61(4):344-349. doi:10.1016/j.jclinepi.2007.11.008 PubMedGoogle ScholarCrossref
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National Center for Health Statistics. Variance estimation guidance, NHIS 2016-2017. Published 2018. Accessed February 2, 2020. https://www.cdc.gov/nchs/data/nhis/2016var.pdf
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The Henry J. Kaiser Family Foundation. Kaiser Health tracking poll: November 2016. Published 2016. Accessed November 13, 2019. http://files.kff.org/attachment/Kaiser-Health-Tracking-Poll-November-2016-Topline
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Bluth  R. Faced with unaffordable drug prices, tens of millions buy medicine outside U.S. Kaiser Health News. Published 2016. Accessed December 15, 2020. https://khn.org/news/faced-with-unaffordable-drug-prices-tens-of-millions-buy-medicine-outside-u-s/
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Jang  SH, Ko  LK, Meischke  H. Factors associated with buying medications abroad by nativity and race/ethnicity in the US. J Immigr Minor Heal. Published online January 20, 2020. doi:10.1007/s10903-020-00979-7
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Sehgal  V, Bajwa  SJ, Sehgal  R, Bajaj  A, Khaira  U, Kresse  V.  Polypharmacy and potentially inappropriate medication use as the precipitating factor in readmissions to the hospital.   J Family Med Prim Care. 2013;2(2):194-199. doi:10.4103/2249-4863.117423 PubMedGoogle ScholarCrossref
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Pasina  L, Brucato  AL, Falcone  C,  et al.  Medication non-adherence among elderly patients newly discharged and receiving polypharmacy.   Drugs Aging. 2014;31(4):283-289. doi:10.1007/s40266-014-0163-7 PubMedGoogle ScholarCrossref
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Qato  DM, Wilder  J, Schumm  LP, Gillet  V, Alexander  GC.  Changes in prescription and over-the-counter medication and dietary supplement use among older adults in the United States, 2005 vs 2011.   JAMA Intern Med. 2016;176(4):473-482. doi:10.1001/jamainternmed.2015.8581 PubMedGoogle ScholarCrossref
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Turner  K, Hong  YR, Yadav  S, Huo  J, Mainous  AG.  Patient portal utilization: before and after stage 2 electronic health record meaningful use.   J Am Med Inform Assoc. 2019;26(10):960-967. doi:10.1093/jamia/ocz030 PubMedGoogle ScholarCrossref
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Mainous  AG  III, Everett  CJ, Post  RE, Diaz  VA, Hueston  WJ.  Availability of antibiotics for purchase without a prescription on the internet.   Ann Fam Med. 2009;7(5):431-435. doi:10.1370/afm.999 PubMedGoogle ScholarCrossref
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Blackstone  EA, Fuhr  JP  Jr, Pociask  S.  The health and economic effects of counterfeit drugs.   Am Health Drug Benefits. 2014;7(4):216-224.PubMedGoogle Scholar
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Clark  F.  Rise in online pharmacies sees counterfeit drugs go global.   Lancet. 2015;386(10001):1327-1328. doi:10.1016/S0140-6736(15)00394-3 PubMedGoogle ScholarCrossref
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World Health Organization. A study on the public health and socioeconomic impact of substandard and falsified medical products. Published 2017. Accessed January 3, 2020. https://www.who.int/medicines/regulation/ssffc/publications/se-study-sf/en/
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The National Association of Boards of Pharmacy. Internet drug outlet identification program progress report for state and federal regulators: August 2017. Published 2017. Accessed February 12, 2020. https://nabp.pharmacy/wp-content/uploads/2016/08/Internet-Drug-Outlet-Report-August-2017.pdf
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Mackey  TK, Nayyar  G.  Digital danger: a review of the global public health, patient safety and cybersecurity threats posed by illicit online pharmacies.   Br Med Bull. 2016;118(1):110-126. doi:10.1093/bmb/ldw016 PubMedGoogle ScholarCrossref
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Fittler  A, Bősze  G, Botz  L.  Evaluating aspects of online medication safety in long-term follow-up of 136 internet pharmacies: illegal rogue online pharmacies flourish and are long-lived.   J Med internet Res. 2013;15(9):e199. doi:10.2196/jmir.2606 PubMedGoogle Scholar
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de Guzman  GC, Khaleghi  M, Riffenberg  RH, Clark  RF.  A survey of the use of foreign-purchased medications in a border community emergency department patient population.   J Emerg Med. 2007;33(2):213-221. doi:10.1016/j.jemermed.2007.02.019 PubMedGoogle ScholarCrossref
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Casner  PR, Guerra  LG.  Purchasing prescription medication in Mexico without a prescription. The experience at the border.   West J Med. 1992;156(5):512-516.PubMedGoogle Scholar
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    Original Investigation
    Health Policy
    June 24, 2020

    Socioeconomic and Demographic Characteristics of US Adults Who Purchase Prescription Drugs From Other Countries

    Author Affiliations
    • 1Department of Health Services Research Management, and Policy, College of Public Health and Health Professions, University of Florida, Gainesville
    • 2Department of Pharmaceutical Outcomes and Policy, College of Pharmacy, University of Florida, Gainesville
    • 3Center for Drug Evaluation and Safety, University of Florida, Gainesville
    • 4Department of Community Health and Family Medicine, College of Medicine, University of Florida, Gainesville
    JAMA Netw Open. 2020;3(6):e208968. doi:10.1001/jamanetworkopen.2020.8968
    Key Points español 中文 (chinese)

    Question  How many US adults buy or import drugs to save money, and what factors are associated with their purchase of medications outside the US?

    Findings  In this cross-sectional study of 61 238 US adults taking prescription medication, 1.5% reported medication purchases from countries outside the US. Use of the internet for health information and online pharmacy purchases was associated with medication purchases outside the US.

    Meaning  The findings suggest that patients are not using prescription purchases outside the US to meet their medication needs.

    Abstract

    Importance  Little is known about the current use of imported drugs and the factors associated with individual purchase of medications outside the US.

    Objective  To evaluate the proportion of the US adult population that purchases medications in other countries and the patient factors associated with the behavior.

    Design, Setting, and Participants  This retrospective cross-sectional study used data from the 2015-2017 National Health Interview Survey. The study sample included 61 238 individuals 18 years or older who reported use of prescribed medication by a physician or other practitioner. Data analysis was performed in November 2019.

    Main Outcomes and Measures  Self-reported experience of purchasing prescription drugs from countries outside the US in the past 12 months. Internet use behaviors for health care included searches for health information and filling of a prescription online. Medication-taking behaviors included skipping or delaying filling a prescription and using alternative therapies to save money. Survey design–adjusted analysis was used to estimate and compare characteristics between those who purchased medications outside the US and those did not. Multivariable logistic regression was fitted to examine the association of medication purchases with internet use and medication-taking behavior factors.

    Results  Among 61 238 US adults taking prescription medications (mean [SD] age, 50.5 [18.5] years; 56.5% female; 70.8% white), the estimated prevalence of purchasing of medication outside the US was 1.5% (95% CI, 1.4%-1.7%; 2.3 million US individuals). Those who purchased medications outside the US were more likely to be older (age >64 years; adjusted odds ratio [aOR], 1.68; 95% CI, 1.24-2.29), to be from Hispanic (aOR, 1.70; 95% CI, 1.23-2.35) or immigrant populations (aOR, 3.20; 95% CI, 2.44-4.20), and to have higher educational attainment (bachelor's degree; aOR, 1.79; 95% CI, 1.27-2.54), lower family income (low income; aOR, 1.41; 95% CI, 1.06-1.87), and lack of insurance (aOR, 3.14; 95% CI, 2.33-4.21). Data analyses indicated that online health information–seeking behavior (aOR, 1.62; 95% CI, 1.33-1.98) or use of an online pharmacy (aOR, 2.30; 95% CI, 1.83-2.90) was associated with a greater likelihood of medication purchases outside the US. Individuals who skipped medications (aOR, 3.86; 95% CI, 3.05-4.88) or delayed filling a prescription (aOR, 4.04, 95% CI, 3.23-5.06) also had higher odds of purchasing medication outside the US.

    Conclusions and Relevance  The findings suggest that patients are not using prescription purchases outside the US to meet their medication needs. However, monitoring to promote safe administration of medications imported into the US should be continued.

    Introduction

    Health care spending in the US is substantially higher than in other high-income nations and has outpaced overall national economic growth for several decades.1 US health care spending now reaches $3.65 trillion, accounting for 17.7% of the gross domestic product in 2018.2 According to the US Government Accountability Office, US spending on drugs increased by approximately 25% from 2013 and 2017.3 Recent estimates suggest that overall out-of-pocket costs have increased from $56 billion in 2014 to $61 billion in 2018.4 Furthermore, forecasts suggest that the net spending in medications will increase from $344 billion in 2018 to $420 billion by 2023.4

    As patients are faced with decisions on how to purchase these medications, a multitude of proposals at the state and federal level have been forwarded as strategies to counteract the increasing drug pricing issues.5-7 Because drug prices in some other countries, especially Canada, are lower than those in the US, the Trump administration plans to allow drug importation—also known as the Safe Importation Action Plan—from Canada and possibly other countries to stimulate price competition.8 The US Food and Drug Administration is also taking steps to establish this pathway and others for safe drug importation in compliance with §801 of the Federal Food, Drug, and Cosmetic Act.9

    When devising policies to address drug importation successfully, policy makers should understand the factors associated with recent individual purchase of medications outside the US. Previous work10 has suggested that financial difficulties associated with being uninsured or underinsured are the main factors associated with this pattern; however, little is known about the characteristics and behavioral patterns (eg, internet use and medication-taking behaviors) of individuals who purchased their medications outside the US. Cost-related medication nonadherence (ie, skipping doses or delaying prescription refill because of cost) is a significant problem in chronic disease management.11,12 It is not clear whether medication purchases outside the US to save money are associated with medication adherence. Moreover, internet access makes it easier for many US adults to buy cheaper drugs or refill their prescriptions online. Currently, there is a gap in the literature on the characteristics of patients who buy prescription medicine outside the US. To address these research gaps, this study aimed to use nationally representative survey data (1) to evaluate the proportion of the US adult population who recently purchased prescription medications outside the US to save money, (2) to identify the key socioeconomic and patient factors associated with purchasing medications outside the US, and (3) to assess the associations between internet use and medication-taking behaviors and medication purchases outside the US.

    Methods
    Data Source and Study Sample

    This retrospective, cross-sectional study used aggregated data from the 2015-2017 National Health Interview Survey (NHIS). The NHIS is a nationally representative survey of the civilian, noninstitutionalized US population with a mean response rate of 80% that is conducted annually by the National Center for Health Statistics to track health status and health services use in the US.13 The NHIS is the country’s largest in-person household health survey that has been used extensively in health services research to address medication-related issues of cost and nonadherence. To include both household and individual-level information, we merged 3 NHIS components (adult sample, person, and family files) using a unique person identifier. This study was deemed exempt from review by the University of Florida Institutional Review Board because we used publicly available, deidentified data; therefore, no informed consent was required. The study followed the Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) reporting guideline.14

    We analyzed data for survey respondents 18 years or older who reported taking medication prescribed by a physician or other health care professional in the past 12 months. We excluded respondents who had missing information on socioeconomic variables, health insurance status, and health information use (<0.5% missingness). eTable 1 in the Supplement presents the steps of the analytic sample selection process.

    Measures
    Medication Purchases Outside the US

    Our primary outcome variable was the purchase of prescription drugs from countries outside the US. Survey respondents were asked whether they bought prescription drugs from a country other than the US to save money during the past 12 months. We defined respondents as purchasers of medications outside the US if they answered yes to the question.

    Internet Use Behaviors

    Internet use behaviors for health care were measured with 3 items: (1) searching for health information on the internet, (2) using online chat groups to learn about health topics, and (3) filling a prescription online during the past 12 months. We constructed binary variables of each item (yes vs no).

    Medication-Taking Behaviors

    Survey participants were also asked whether they (1) skipped medication doses, (2) delayed filling a prescription, or (3) used alternative therapies to save money in the past 12 months. Each item was dichotomized according to whether a participant reported the experiences.

    Sociodemographic and Health-Related Covariates

    Other covariates that we included were respondents’ age (18-44, 45-64, or ≥65 years of age), sex (male or female), race/ethnicity (non-Hispanic white, non-Hispanic black, Hispanic, or other), immigration status (born in the US or not), marital status (married or unmarried), employment status (employed or unemployed), educational level (less than high school, high school or General Educational Development, some college, bachelor’s degree, or graduate degree or higher), family income (low income [federal poverty level <200%], middle income [federal poverty level of 200%–400%], and high income [federal poverty level >400%]), census region (Northeast, Midwest, South, or West), health insurance (private, public, or uninsured), self-reported general health status (excellent or good vs poor or fair), and the number of comorbidities (0, 1, 2, or ≥3). Comorbidities included reports of physician-diagnosed hypertension, diabetes, cardiovascular disease (including coronary heart diseases, angina, myocardial infarction, and other heart diseases), stroke, emphysema, asthma, chronic obstructive pulmonary disease, ulcer, chronic pain (neck, back, or joint), problems with vision or hearing, or any type of cancer.

    Statistical Analysis

    We calculated the weighted prevalence of purchasing medication outside the US to obtain a nationally representative estimate from the combined survey data from January 1, 2015, to December 31, 2017. We followed the analytic guidelines on NHIS data and variance estimation.15 Adjusted Wald F tests were used to compare characteristics between those who purchased medications outside the US and those who did not. We fitted multivariable logistic regression models to examine the likelihood of medication purchases across individual characteristics, internet use, and medication-taking behavior factors. Sociodemographic and health-related covariates included age, race/ethnicity, immigration status, employment status, educational level, family income, census region, type of insurance, general health status, and the number of comorbidities. We also analyzed the primary outcome in subgroups: racial/ethnic groups by immigration status (eg, US-born white individuals, white immigrants, US-born black individuals, and black immigrants) and insurance types by Medicare eligibility (age ≥65 years) and prescription drug benefit (Medicare Part D). Race/ethnicity and immigration status were self-reported, and we conducted these subgroup analyses to further understand whether certain races/ethnicities with immigration status or more specific insurance types were disproportionately associated with medication purchases outside the US. Lastly, we estimated the prevalence of medication purchases outside the US separately for 5 major chronic conditions (hypertension, diabetes, cardiovascular disease, chronic obstructive pulmonary disease, and cancer). Data analysis was performed in November 2019. All analyses were conducted using the PROC SURVEY procedure in SAS, version 9.4 (SAS Institute Inc) to account for selection probability, oversampling, and nonresponse in the survey.15 Statistical significance was tested at a 2-sided P < .05.

    Results
    Prevalence of Prescription Medication Purchases Outside the US to Save Money

    A total of 61 238 respondents 18 years or older in the NHIS 2015-2017 (mean [SE] age, 50.5 [18.5] years; 56.5% female; 70.8% non-Hispanic white), representing 152.2 million US adults taking prescription medications, were included in this study. The weighted prevalence of purchasing of medications outside the US was 1.5% (95% CI, 1.4%-1.7%; 2.3 million US individuals). Before adjustment, the prevalence of purchasing of medication outside the US was significantly different by age, race/ethnicity, immigration status, marital status, educational level, family income, type of health insurance, and self-reported health status (Table 1). Specifically, individuals who purchased medication outside the US were more likely to be middle-aged (1.3% of those aged 18-44 years vs 1.8% of those aged 45-64 years, P = .004), Hispanic (4.2% vs 0.6% non-Hispanic black, P < .001), or immigrants (4.4% vs 1.0% of those who were born in the US, P < .001) and to have a higher educational level (1.1% of those with some high school or General Educational Development vs 2.1 of those with graduate school or higher, P < .001), lower family income (2.0% of those with low income vs 1.3% of those with high income, P < .001), lack of insurance (5.0% vs 1.3% of those with private insurance, P < .001), or poor or fair reported health status (2.2% vs 1.4% of those with excellent or good reported health status, P = .001). The prevalence of purchasing of medication outside the US did not increase with an increasing number of comorbidities.

    Socioeconomic and Health Characteristics Associated With Medication Purchases Outside the US

    In the multivariable logistic regression model, age, race/ethnicity, immigration status, educational level, family income, region, type of insurance, and self-reported health status were significantly associated with medication purchase outside the US (Table 1). After controlling for socioeconomic and health characteristics, those 65 years or older were 1.68 times (adjusted odds ratio [aOR], 1.68; 95% CI, 1.24-2.29) more likely to have purchased medication outside the US compared with those aged 18-44 years. Hispanic individuals (aOR, 1.70; 95% CI, 1.23-2.35) and immigrants (aOR, 3.20; 95% CI, 2.44-4.20) had higher odds of purchasing medication outside the US than non-Hispanic white individuals and those born in the US. Other significant socioeconomic factors for purchasing medication outside the US included having a graduate or higher degree (aOR, 2.61; 95% CI, 1.80-3.77), having low family income (aOR, 1.41; 95% CI, 1.06-1.87), and being uninsured (aOR, 3.14; 95% CI, 2.33-4.21). Those who reported poor or fair health status were 1.32 times (aOR 1.32; 95% CI, 1.06-1.66) more likely to purchase medication outside the US compared with those who reported excellent or good health status.

    Internet Use and Medication Behavior Factors Associated With Medication Purchases Outside the US

    Internet use for health care and medication-taking behavior factors were associated with medication purchase outside the US (Table 2). Our analyses indicated that online health information–seeking behaviors were associated with greater likelihood of medication purchases outside the US. Individuals who searched for health information (aOR, 1.62; 95% CI, 1.33-1.98) or used online chat groups to learn about health care (aOR, 2.07; 95% CI, 1.45-2.94) were approximately twice as likely to purchase medication outside the US than those who did not. Those who filled a prescription online also had a greater likelihood of purchasing medication outside the US (aOR, 2.30; 95% CI, 1.83-2.90). Regarding medication-taking factors, those who skipped medications (aOR, 3.86; 95% CI, 3.05-4.88) or delayed filling a prescription (aOR, 4.04, 95% CI, 3.23-5.06) had higher odds of purchasing medication outside the US. Use of alternative therapies rather than medications prescribed was associated with significantly increased odds of purchasing medication outside the US (aOR 9.23; 95% CI, 7.34-11.61).

    Subgroup Analyses

    We used the same multivariable logistic regression models to calculate the prevalence of purchasing medication outside the US with more granular estimates by immigration status and race/ethnicity (Figure, A), age and type of insurance (Figure, B), and selected health conditions (Figure, C). The racial/ethnic distribution of individuals who purchased medication outside the US was similar between those who were born in the US and immigrants, with the highest estimates for Hispanic individuals (2.9% of US born and 6.4% of immigrants) (eTable 2 in the Supplement). Being an immigrant was associated with a 1.3% to 3.5% increase in estimates across racial/ethnic groups. Among individuals aged 18 to 64 years, those without insurance had the highest estimates (4.5%) of purchasing medication outside the US, followed by those with marketplace insurance (3.4%), employer-based insurance (1.5%), and Medicaid or other public insurance (1.1%). The probability for purchasing medication outside the US varied little by type of health insurance among those ≥65 years or older, with the highest estimate for those with Medicare (3.7%). There was no significant difference in estimates overall for individuals with Medicare Part D. The estimates also did not significantly differ across selected chronic conditions.

    Discussion

    In this nationally representative sample of US adults regarding recent purchase of prescription medication outside the US to save money, the estimated prevalence of medication purchases outside the US was 1.5%, representing 2.3 million US adults. Although the overall prevalence is relatively low for this behavior, this amount represents several million people. Patients did not seem to be using prescription purchases outside the US to meet their medication needs. These nationally representative data on recent behavior are consistent with other US government estimates but inconsistent with estimates from the Kaiser Family Foundation.16,17 The current estimate is lower than the estimate of drug importation reported by the Kaiser Family Foundation (approximately 19 million US adults), which was calculated with the simple extrapolation to the US population in 2016.16,17 Our population estimate of prescription medication purchases from other countries may be more accurate given a larger sample size (61 238 vs 1202) and the established representativeness of the NHIS data.13

    Among sociodemographic factors, we found that older age, being Hispanic or an immigrant, having higher educational attainment, having lower family income, and being uninsured were independently associated with purchasing of medications outside the US. Consistent with previous studies,12,18 disadvantaged sociodemographic characteristics (eg, racial/ethnic minority group and lower income) associated with cost-related medication adherence were also found to be factors associated with medication purchase outside the US to reduce the cost burden. However, having more comorbidities was not associated with the medication purchase outside the US as a means of saving costs. Patients with multiple conditions are likely to be older and receiving more medications, which is associated with health care spending increases and low medication adherence.19,20 A total of 37% or more of US adults aged 62 to 85 years were estimated to be taking 5 or more medications.21 Comprehensive drug plans and benefits for the elderly people (including Medicare Part D and Advantage) may help alleviate the cost burden. In our subgroup analysis, elderly US people with Medicare coverage were only 50% to 80% more likely to buy their prescription drugs from other countries compared with those with additional private coverage or Medicare Part D benefits. Our study also found an association between internet use behaviors (seeking health information and online prescriptions) and medication purchases outside the US. Higher educational attainment is highly correlated with health information technology use (eg, patient portal).22 We observed a similar pattern between advanced academic degrees and medication purchases outside the US in this study. Thus, it is plausible that frequent use of internet and online resources among those with advanced degrees may be a factor associated with an increased odds of medication purchases outside the US. However, more studies are needed to elucidate the reasons why those with higher educational attainment chose to purchase medications outside the US.

    Our findings have several implications for patients and their caregivers who have purchased drugs outside the US or who have been considering importing prescription medications to reduce their out-of-pocket cost burden. There are several risks and safety issues associated with purchasing of medications outside the US regarding counterfeit products and regulatory compliance with good manufacturing practices. Counterfeit medications, also known by the new term substandard and falsified medications adopted by the World Health Association, are associated with significant risks to patients in other countries and US citizens purchasing these products.23 The evidence suggests that more than 10% of all medications sold in the world are counterfeit, and the estimate is a high as 70% for some areas in Africa and Asia.24,25 These substandard medications have therapeutic concentrations that, in the case of antibiotics, could lead to development of antibiotic resistance in addition to the presence of other ingredients and contaminants besides the active ingredient.23,26 Manufacturing of medications in some countries might not be as strictly regulated as in higher-income countries, which raises safety concerns in particular for the production of generic products that might not meet good manufacturing practices or bioequivalence standards.26,27 Although the public is free to purchase medications outside the US, patients should be informed of potential risks they can encounter when using rogue internet pharmacies. These online pharmacies have a strong presence through social media posts, online chats and forums, and internet searches.28,29 Policies that seek to pursue drug importation from countries other than the US should consider the potential for drug manufacturing quality issues.

    Limitations

    This study has limitations. First, we were able to estimate recent purchases, but we were not able to estimate purchasing by medication class (eg, antibiotics, cancer treatments, and erectile dysfunction medications). This information would be beneficial to provide context for which conditions patients believe they need to purchase medications outside the US. Previous evidence suggests that given the high costs of certain classes of drugs, cost-saving practices might be more prevalent for those patients.30 Second, the NHIS question on purchasing medications outside the US is primed to indicate that the main purpose for this activity is to save money. We were not able to capture other reasons for prescription purchase outside the US with the current data. Third, we only included information for patients who had complete information for variables of interest in this study. The percentage of survey respondents with missing information was low (<1.1%), and we do not expect that results would be significantly different for these patients. Fourth, this study did not address the source country of the medication. Previous literature has suggested that purchasing prescription medications without a prescription in a country outside the US or over the internet (eg, antibiotics) is also associated with risk23,31; however, this was not captured in the questions provided in the NHIS. Individuals living in states that neighbor Canada and Mexico are likely to go across the respective borders to purchase medications in the other country.10,31,32 The NHIS data only contain information on the US geographic region. However, individuals can purchase medications from Canada over the internet regardless of how close their residence is to Canada.

    Conclusions

    The current study provides, to our knowledge, the first national benchmark estimates on the prevalence of purchasing of prescription medications by US adults in another country to save money. Among US adults taking prescription medications, 1.5% (representing 2.3 million US individuals) reported that they purchased their medications from countries outside the US to save money. Financial constraints on refilling prescription, along with inadequate coverage and internet use for health care, were significantly associated with medication purchase outside the US. Given the expected changes in prescription drug importation rules, continued monitoring appears to be needed to examine the patterns of medication purchase behaviors and factors that facilitate or impede the use of imported drugs. Future research regarding the economic evaluation of changing drug importation rules in the US health care system is also warranted.

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    Article Information

    Accepted for Publication: April 19, 2020.

    Published: June 24, 2020. doi:10.1001/jamanetworkopen.2020.8968

    Open Access: This is an open access article distributed under the terms of the CC-BY License. © 2020 Hong Y-R et al. JAMA Network Open.

    Corresponding Author: Young-Rock Hong, PhD, MPH, Department of Health Services Research, Management and Policy, College of Public Health and Health Professions, University of Florida, PO Box 100195, Gainesville, FL 32610 (youngrock.h@phhp.ufl.edu).

    Author Contributions: Dr Hong had full access to all the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.

    Concept and design: Hong, Hincapie-Castillo, Mainous.

    Acquisition, analysis, or interpretation of data: Hong, Xie, Segal.

    Drafting of the manuscript: Hong, Hincapie-Castillo.

    Critical revision of the manuscript for important intellectual content: All authors.

    Statistical analysis: Hong, Xie.

    Obtained funding: Hong.

    Administrative, technical, or material support: Hong, Hincapie-Castillo, Xie, Segal.

    Supervision: Hong, Mainous.

    Conflict of Interest Disclosures: None reported.

    Additional Contributions: Ikiah Young, ME, Department of Health Services Research, Management, and Policy, College of Public Health and Health Professions, University of Florida, Gainesville, assisted with manuscript preparation and editing. Ms Young was not compensated for her work.

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