Antibiotic burden is not evenly distributed
Outpatient antibiotic use is common across childhood, but a new national analysis suggests one group stands out sharply from the rest: children with medical complexity. Researchers from Boston Children’s Hospital found that annual antibiotic prescription rates increased nonlinearly as children’s underlying level of medical complexity rose, with the highest burden falling on those with three or more complex chronic conditions.
The findings were presented at the Pediatric Academic Societies 2026 Meeting in Boston and point to a population that may deserve much closer attention in antibiotic stewardship efforts. According to the study, children with multiple complex chronic conditions were not only more likely to fill antibiotic prescriptions, but were also more likely to receive broad-spectrum antibiotics with less favorable safety profiles.
That matters because frequent antibiotic exposure carries well-known risks. These include antibiotic-related complications such as
C. difficile infection, along with the broader public health danger of antibiotic resistance. Overuse and misuse have long been recognized as drivers of resistant infections. What this study adds is a clearer picture of just how concentrated that exposure may be among medically complex children.
A national look at Medicaid prescription claims
The research team conducted a retrospective cohort study using the multistate MarketScan Medicaid Database. They examined outpatient antibiotic prescription claims among children ages 0 to 18 who were continuously enrolled in Medicaid during 2023. The children were grouped into five mutually exclusive categories of underlying medical complexity.
Across the entire study population, antibiotic use was widespread. More than a third of children filled at least one antibiotic prescription in 2023, according to lead author Kathleen D. Snow of Boston Children’s Hospital. But the averages concealed a striking gradient. As complexity increased, so did prescription fill rates, total annual antibiotic exposure, and use of broader-spectrum drug classes.
The most medically complex children had the highest annual prescription rates of any population group, adult or pediatric, cited by the study. That is an extraordinary benchmark. It suggests that medically complex children are not simply another subgroup within the broader stewardship conversation. They may be one of the most antibiotic-exposed populations in the health system.
Why medical complexity changes the picture
Children with complex chronic conditions often face recurrent infections, frequent healthcare encounters, and a high degree of clinical vulnerability. Those realities can make antibiotic prescribing more common and, at times, more urgent. But higher need does not automatically mean every prescription is optimal, nor does it reduce the cumulative risks of repeated exposure.
The study’s concern is not that these children should never receive antibiotics. Rather, it suggests they may be an especially high-impact population for refining how antibiotics are used. Broad-spectrum drugs can be appropriate in some situations, but they also tend to carry tradeoffs, including safety concerns and greater selective pressure for resistance. If children with multiple chronic conditions receive these agents more often than their healthier peers, the case for closer review becomes stronger.
Stewardship programs have typically focused on hospitals, common pediatric infections, and broad prescribing patterns across clinics. This study pushes the conversation toward a more targeted question: which children experience the greatest cumulative exposure, and where could safer or narrower prescribing make the biggest difference?
The clinical and policy implications
Because the study focused on Medicaid-enrolled children, it also intersects with questions of healthcare equity and system design. Medicaid covers many children with significant medical needs, and the outpatient setting is where much of their routine treatment occurs. That means any stewardship intervention aimed at this group would need to work across clinics, specialty care, and community prescribing environments rather than relying solely on hospital-based oversight.
The authors frame children with medical complexity as an important target population for future stewardship efforts. That is a practical conclusion. When prescribing levels are this high, even modest improvements in antibiotic selection, duration, or necessity could have outsized effects on both safety and resistance pressure.
It also implies a need for more tailored tools. Standard prescribing guidance may not map neatly onto children with multiple chronic conditions, medical devices, or unusual infection histories. Clinicians may need decision support that reflects the realities of this group rather than treating them as exceptions to guidelines built for otherwise healthy children.
At the same time, the study does not argue that frequent prescribing is inherently inappropriate. Claims data can show what was filled, not the bedside reasoning behind each prescription. The value of the analysis lies in identifying where the burden is concentrated and where further review is likely to matter most.
A stewardship priority hiding in plain sight
Antibiotic resistance is often discussed as a diffuse global threat, but the path to improvement frequently runs through very specific patient groups. This study suggests that one of those groups is children with the highest levels of medical complexity. They are vulnerable to infection, vulnerable to complications from treatment, and exposed to antibiotics at unusually high rates.
That combination creates a difficult clinical balance. Providers must protect children at high risk while also avoiding unnecessary harms from repeated antibiotic use. The new analysis does not remove that tension, but it makes the stakes easier to see.
More than a third of Medicaid-enrolled children in the study filled at least one antibiotic prescription in a single year. Among children with multiple complex chronic conditions, the burden was markedly greater still. For stewardship programs looking for where attention could yield the largest benefit, that is a clear signal.
The broader challenge now is to convert that signal into practice: better prescribing review, more nuanced pediatric guidance, and research that distinguishes necessary treatment from avoidable exposure. For medically complex children, antibiotic stewardship is not a peripheral concern. It may be one of the most consequential ways to improve care quality and reduce downstream risk.
This article is based on reporting by Medical Xpress. Read the original article.
Originally published on medicalxpress.com
