Opioid Epidemic’s Epicenter Shifted Eastward, New UC Analysis Shows
University of Cincinnati analysis shows the US opioid epidemic shifted from the Northwest to the East (2005-2020), driven by fentanyl, heroin and policy changes.
A geographical analysis by researchers at the University of Cincinnati finds the center of the US opioid epidemic moved from the Northwest toward the Eastern United States between 2005 and 2020, a period that saw 665,341 overdose deaths. The study, published in The Lancet Regional Health—Americas, traces how changes in prescribing practice, law enforcement and the drug supply altered where and how fatal overdoses occurred. Investigators link the shift to transitions from prescription opioids to heroin and then to potent synthetic opioids such as fentanyl. The research also documents changing demographic patterns among victims as the crisis evolved.
Study Maps Opioid Epicenter Shift
The researchers used county-level mortality data from the Centers for Disease Control and Prevention to map fatal overdoses over time and space. Their analysis identifies a clear movement of the epidemic’s geographic center between roughly 2013 and 2016, coinciding with policy interventions and criminal prosecutions targeting prescription practices. The team says the pattern is not uniform but reflects a sequence of local surges—what they describe as a series of hotspots—that collectively shifted the national epicenter eastward. Authors emphasize that the epidemic’s geography reflects underlying changes in supply, demand and access to substances.
Policy Changes Coincide with Geographic Movement
Investigators link the timing of the geographic shift to tighter regulations on opioid prescribing and high-profile prosecutions of clinicians accused of overprescribing. Those interventions, while reducing availability of prescription opioids, created a gap for people with opioid use disorder who still required a supply. According to the study team, the constrained legal market pushed many users toward illicit alternatives, including heroin and, later, fentanyl, which reshaped overdose risk and spatial patterns. Researchers caution that well-intentioned policy can have unintended consequences if not paired with expanded treatment and harm-reduction services.
From Prescription Pills to Fentanyl
The substance mix driving overdose deaths evolved markedly over the study period, the authors report. Early in the timeframe, prescription opioids dominated overdose mortality; by the mid-2010s, heroin’s prevalence rose and was soon overtaken by synthetic opioids such as fentanyl. Fentanyl’s high potency and frequent presence as an adulterant increased the lethality of the illicit supply and accelerated mortality rates in newly affected regions. Study co-author Diego Cuadros of UC noted that changes in the drug market have been a primary force shifting who is at greatest risk and where fatalities concentrate.
Demographic Patterns Evolved
The analysis shows that populations affected by the crisis broadened geographically and demographically over time. Initial mortality clusters were concentrated in predominantly White communities, but later waves included larger numbers of Black victims as synthetic opioids entered additional markets. Lead author Santiago Escobar said the changing supply channels and means of access were central to why different populations began experiencing higher mortality. The researchers argue that recognizing these demographic shifts is crucial for designing prevention, treatment and outreach interventions tailored to affected communities.
Hotspots and Mini-Epidemics Identified
Rather than a single, static outbreak, the team describes the national crisis as composed of many localized surges. Their earlier work identified concentrated clusters in states such as Ohio and elsewhere, and the current study extends that hotspot framework nationwide. By tracking county-level trends across years, researchers were able to flag migrating centers of mortality and distinguish short-term spikes from persistent high-risk areas. Co-author Neil McKinnon, president of Central Michigan University, said framing the epidemic as a network of mini-epidemics can help public health officials target resources more efficiently.
Implications for Public Health Strategy
The study underscores that supply-side interventions alone are unlikely to end the crisis without concurrent expansion of treatment, harm-reduction and social supports. Authors recommend policies that anticipate shifts in the illicit market and prioritize access to medication-assisted treatment, naloxone distribution, and safe consumption services where legally possible. They also call for continued monitoring at fine geographic scales so public health responses can adapt quickly to new hotspots. The researchers assert that timely, localized data are essential to reduce fatalities as the epidemic continues to change.
The University of Cincinnati team stresses that the opioid epidemic remains dynamic, shaped by interactions among regulation, market forces and community vulnerability, and that ongoing surveillance and a balanced policy mix are necessary to prevent further waves of deaths.
