A new study from High Rise Financial on prescription drug safety is raising alarms about a growing and often preventable threat within American healthcare: medication harm driven by complex prescriptions, preventable errors, and ongoing quality failures. While prescription drugs remain essential to managing chronic disease, pain, and mental health, the study highlights a harsh reality: the same system that treats millions can also injure them at scale.
According to the Health Policy Institute, more than 131 million Americans, roughly 66% of adults, rely on prescription medications. Yet national data confirms that problems, including polypharmacy, dosing errors, and quality failures, contribute to an estimated 1.5 million emergency department visits every year. Even more concerning, about one-third of hospital visits tied to adverse drug effects result in full admissions, indicating that medication injuries are frequently serious, not minor.
This study breaks down the “how” behind the numbers: how medication errors happen, what types of injuries are most common, why older adults are disproportionately harmed, and how recalled or compromised drugs can remain in use long enough to trigger emergencies. The overarching conclusion is blunt: a large share of medication harm is preventable, but prevention requires stronger safeguards across prescribing, dispensing, monitoring, and patient education.
Medication Misuse and Adverse Drug Events
Medication errors are among the most persistent patient-safety failures in the U.S. healthcare system. The study cites patient-safety research suggesting that an estimated 50% of adverse drug events (ADEs) are preventable, meaning they arise not from unavoidable side effects, but from breakdowns in how medications are prescribed, filled, taken, or supervised.
ADEs can occur when patients receive the wrong dosage, combine medications that interact dangerously, misunderstand dosing schedules, or are not adequately monitored after starting a new drug. The study notes that a significant portion of the 1.5 million annual emergency visits escalate to hospitalization (approximately 500,000 admissions) because of complications like overdosing, severe allergic reactions, internal bleeding, or uncontrolled glucose events.
Polypharmacy: When “More Meds” Means More Risk
One of the biggest drivers of medication harm is polypharmacy, commonly defined as taking multiple medications at the same time. The study highlights that nearly one in three U.S. adults takes five or more medications, a level that increases complexity dramatically. When multiple prescribers are involved, medication lists can become fragmented, duplicative, or outdated, raising the odds of interactions and dosing problems.
The risk jump is not subtle. Study data emphasizes that patients taking five or more medications are about 30% more likely to experience adverse drug events. And because chronic conditions increase with age, older adults are far more likely to fall into high-risk polypharmacy patterns.
Why Older Adults Are Hit Hardest
Adults aged 65 and older carry a disproportionate share of medication-related harm. The study notes that seniors account for roughly 600,000 emergency department visits each year related to ADEs. Age-related changes in metabolism and organ function can amplify side effects, while chronic disease management often requires multiple concurrent prescriptions, creating a perfect storm for injury when dosing, monitoring, or transitions of care go wrong.
Care transitions, such as hospital discharge, moving between facilities, or switching from inpatient to outpatient care, are described as especially vulnerable moments. If medication instructions are unclear, if prescriptions are accidentally duplicated, or if a key drug is omitted, the patient may return home with an unsafe regimen. The study frames this as a systemic issue: medication harm is not just about individual behavior; it’s about gaps in coordination and oversight.
High-Risk Drug Classes and Common Injury Patterns
The study identifies several drug categories repeatedly tied to emergency harm. Anticoagulants are involved in roughly 21% of ADE-related emergency visits, followed by insulin (14%) and antibiotics (13%)—a pattern consistent with the reality that these medications often require precise dosing and careful monitoring.
When medication injuries occur, they frequently involve serious outcomes. The study’s breakdown of ADE injury types shows:
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Bleeding injuries (25%), commonly linked to anticoagulants and dosing errors.
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Glucose-related complications (15%), including hypoglycemia and dangerous blood-sugar swings tied to insulin and diabetes drugs.
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Allergic reactions/anaphylaxis (10%), ranging from severe rashes to respiratory distress.
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Cardiovascular and neurological injuries (each ~8%), such as arrhythmias, blood pressure instability, seizures, confusion, and altered mental status.
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Fall-related trauma (8%), often triggered by dizziness, sedation, or low blood pressure—especially dangerous for seniors.
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Kidney injury (7%), often tied to toxicity or dosing issues.
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Gastrointestinal injuries (6%) and respiratory complications (5%), including severe vomiting, bleeding, suppression of breathing, or hypoxia.
The study stresses that these are not “mild side effects.” Many of these events compromise vital organ systems and can lead to long-term consequences.
Recalls Add Another Layer of Risk
While many ADEs are linked to misuse or monitoring gaps, recalls can be a direct trigger when medications are contaminated, mislabeled, too strong, too weak, or fail dissolution testing. The study points to 2025 recall examples across widely used medications, illustrating how manufacturing problems can affect products used daily by large populations.
The Bottom Line
Prescription drugs are central to modern health, but the study argues that the U.S. is facing a medication safety problem big enough to be considered a public health crisis. With 1.5 million emergency visits, hundreds of thousands of hospital admissions, and a significant share of events considered preventable, the study calls for stronger medication review practices, clearer patient instructions, better coordination during care transitions, and improved recall transparency, so fewer people are harmed by the very treatments meant to help them.
