Mapping pharmacy deserts in North Carolina: A geospatial analysis and its implications for University of North Carolina Health's catchment population.

BACKGROUND

Pharmacy deserts represent areas where residents face notable challenges to accessing pharmacies. North Carolina (NC) presents an intriguing case study due to its diverse geographic landscape yet lacks extensive research regarding its pharmacy deserts.

OBJECTIVES

This study aims to map pharmacy deserts in NC using pharmacy location and social determinants of health (SDOH) data measured using the social vulnerability index (SVI) and descriptively characterize health care utilization statistics for University of North Carolina (UNC) Health's catchment population.

METHODS

Pharmacy location data was compiled from the NC Board of Pharmacy. Pharmacy deserts were defined based on SVI > 0.75 and distance thresholds aligned to United States Department of Agriculture standards. Residential characteristics were retrieved from PolicyMap and Social Explorer databases. UNC Health patient utilization data were collected by UNC Pharmacy Data Analytics group for 3 NC counties.

RESULTS

Two thousand and two NC pharmacies met inclusion criteria. 17.2% urban tracts (1.3M residents) and 4.25% rural tracts (0.14M residents) were identified as pharmacy deserts (adj. P < 0.001). Those residing in deserts had significantly less internet access, annual medical cost per capita, and access to homeless relief services as well as significantly higher food insecurity rates and Medicare cost per capita (adj. P < 0.001). UNC-specific health care utilization statistics for the 3 assessed counties were all poorer in deserts compared to nondeserts within the same counties (P > 0.05).

CONCLUSION

A geospatial map with the location of pharmacy deserts in NC was created to highlight differences in patient health care utilization, affecting rural and urban areas. By incorporating SDOH predictors, this study provides a more nuanced map of NC pharmacy deserts compared to reviewing distance to pharmacies alone. Higher rates of emergency department and inpatient visits in counties with more residents in pharmacy deserts suggests potential health outcomes associated with limited pharmacy access.