A comprehensive new study from Siegfried & Jensen on U.S. medication-error trends has revealed that some of the country’s most vulnerable patients—including seniors, children, and individuals with mental illness- are being harmed at alarming rates by avoidable prescription mistakes. With 1.5 million people affected annually and up to 9,000 deaths each year, the report exposes a growing public health crisis tied directly to lapses in prescribing, dispensing, and medication management.
“Medication errors are not isolated incidents—they are systemic, deeply embedded, and too often fatal,” said a spokesperson from the firm. “This new data shows the need for urgent action across every level of healthcare delivery.”
Millions Receive the Wrong Drug, Wrong Dose, or Wrong Instructions
According to the study, medication errors occur in:
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Hospitals
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Pharmacies
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Nursing homes
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Outpatient clinics
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Private homes
These mistakes include incorrect medications, timing errors, look-alike/sound-alike drug mix-ups, misprescribed high-risk drugs, and mislabeled or improperly dispensed prescriptions.
The consequences range from allergic reactions and hallucinations to heart failure, seizures, and fatal overdose.
Older Americans: The Most Vulnerable Group
Patients aged 65 and older are the most heavily affected:
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90% take at least one prescription
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40% take five or more (polypharmacy)
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Polypharmacy increases the chance of medication errors by 30–38%
For elderly patients—especially those who are frail or cognitively impaired—the wrong dosage or drug can trigger catastrophic complications such as:
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Blood pressure crashes
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Organ toxicity
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Delirium
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Falls
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Dangerous drug interactions
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Respiratory depression
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Stroke
Mental Health Patients at Elevated Risk
The study also finds that:
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19% of all medication errors involve antipsychotic medications
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Up to 49% of individuals with severe mental illness misuse their medication
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Incorrect administration can worsen hallucinations, trigger psychosis, or cause severe neurological side effects
These patients often rely on precise dosing schedules, yet are disproportionately harmed by prescribing and monitoring failures.
Children Face a Separate Set of Risks
Medication errors in pediatric care—especially at home—range from 2% to 33%, largely due to:
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Caregiver dosing confusion
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Misinterpreted labels
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Liquid medication measuring errors
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Lack of pharmacist or provider guidance
Because children metabolize drugs differently, even small errors can cause extreme adverse reactions.
Where Errors Happen Most: Pharmacy Oversight Problems
In 2024, disciplinary data showed clusters of pharmacist errors in several states:
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Texas, Michigan, and Ohio top the list
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California, Nevada, New York, and Florida also report high numbers
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Staffing shortages and overwhelming prescription volume are key contributors
80% of pharmacists say they’ve witnessed or experienced an error tied to inadequate staffing.
Why These Errors Happen: Systemic Failures
According to the report, the root causes include:
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Illegible prescriptions
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Missing patient histories
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Lack of drug-interaction checks
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Staff burnout
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Look-alike/sound-alike drug name confusion
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Inadequate safety protocols
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Miscommunication between providers and pharmacies
Many errors occur before the prescription even leaves the doctor’s office.
The Economic Consequences Are Massive
Medication-error consequences cost:
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$20 billion in direct healthcare expenses
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Up to $77 billion per year in total national impact
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Billions in litigation and long-term care costs
The study notes that these costs are rising annually.
A Preventable Crisis
The report concludes with a clear message: medication errors are one of the most preventable causes of serious harm in American healthcare.
“When a doctor prescribes the wrong drug or a pharmacist dispenses the wrong strength, patients pay the price,” said a spokesperson from the firm. “Accountability matters—because lives are at stake.”
Siegfried & Jensen urges federal and state regulators to expand pharmacy safety inspections, mandate clearer prescription protocols, increase staffing requirements, and build more robust patient-education programs.