One Wrong Number, One Wrong Dose: Why Overdose and Underdose Are Hiding in Plain Sight Across Modern Medicine

LifestyleBy MedBary Team7/8/20269 min read

A few extra milligrams. A spoon instead of a syringe. A weight typed from memory instead of read off a scale. This is how misdosing actually happens — not through carelessness, but through gaps hiding in plain sight.

Dose Accuracy Dossier · 01

Field Report / Medication Safety

Misdosing, Overdose & Underdose: More Common Than You Think

Overdose zone — too much drug for the body to clear safely

Correct-dose band — narrower than most people assume

Underdose zone — too little to treat the condition

Getting a dose wrong rarely announces itself. It looks like a few extra milligrams calculated from a kidney function that shifted overnight, a child's cough syrup measured with a kitchen spoon instead of the syringe it came with, or a weight typed in from memory instead of read off a scale. Across hospital wards, pharmacy counters, and family kitchens, misdosing — giving too much or too little of a medication — turns out to be far more common than most people assume. This piece traces where these gaps open up, who carries the greatest risk, and what genuinely closes them.

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Key Highlights

Five Findings

Kidney function governs how safely most drugs clear the body, yet close to one in seven people worldwide live with chronic kidney disease, and major clinical dosing references frequently disagree on how doses should shift around it.

Self-reported height and weight are often inaccurate enough to distort weight-based dosing; one clinical study found a common blood thinner would have been overdosed in roughly three-quarters of patients relying on self-reported weight instead of a calibrated scale.

At-home pediatric medication errors appear in anywhere from three in ten to four in five households studied, and the risk climbs sharply once a prescription involves more than two medications.

Men are two to three times more likely than women to die of an unintentional drug overdose, a gap researchers partly trace to combining alcohol with opioids, which compounds respiratory depression.

Prescription drug misuse among college students tends to happen alone, at home, on weekdays — the opposite of the weekend, social pattern most campus prevention messaging is built around.

Why It Matters

A Systems Problem, Not a Carelessness Problem

Dosing errors sit near the top of the list of preventable threats to patient safety, trailing only complications from surgery. That ranking makes sense once the math is laid out: give too much of a drug and a patient can face toxicity, bleeding, organ strain, or worse; give too little and the underlying condition goes untreated, sometimes with equally serious consequences. Anticoagulants make the tension especially visible — a dose too high raises the risk of dangerous bleeding, while a dose too low leaves a patient exposed to clotting or stroke. There is rarely a single “safe” number; the right dose depends on a person's kidneys, liver, age, body composition, and whatever else they happen to be taking at the same time.

What makes misdosing a public health issue rather than an isolated clinical hiccup is how many separate systems have to work correctly, all at once, for a dose to land right. A prescriber has to estimate organ function from imperfect formulas. A pharmacist has to catch conflicting guidance across reference sources. A caregiver has to translate a label into an actual measured amount, often at home, often without the tools designed for the job. Layer in an opioid overdose crisis, an aging population managing ten or more medications at once, and young adults quietly misusing prescriptions on ordinary weekday afternoons, and the picture becomes less about individual carelessness and more about where the guardrails are missing. Fixing that means building better defaults into the systems people already rely on, not simply asking everyone to be more careful.

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Five Places the Dose Gets Lost in Translation

Detailed Viewpoint

Finding 01

The Kidney Variable

Kidney function is one of the most common variables clinicians must account for, yet also one of the hardest to pin down. Roughly one in seven people worldwide live with chronic kidney disease, and close to a quarter of hospitalized patients develop acute kidney injury during their stay — a share that climbs past half in intensive care. Because many drugs are cleared through the kidneys, function that shifts day to day makes dosing a moving target rather than a fixed calculation. Complicating things further, the clinical guides meant to standardize renal dose adjustments often disagree with one another; a comparison of several widely used references found inconsistent, sometimes vague recommendations across dozens of commonly adjusted medications. Structured regulatory guidance on this exact problem in the United States didn't exist before the late 1990s, and even now, only a minority of newly approved drugs are studied specifically in patients receiving dialysis or similar therapies.

Finding 02

When the Numbers on the Chart Are Wrong

Even when a dosing formula is sound, it is only as good as the numbers fed into it. A 2025 study of more than 700 patients found that self-reported height and weight were often meaningfully off — height overestimated by close to two centimeters on average, weight underestimated by close to a kilogram and a half, with larger gaps among older and heavier patients. Researchers then modeled what that inaccuracy would do to two weight-based drugs: a widely used blood thinner would have been overdosed in the large majority of patients and underdosed in a smaller share, while a chemotherapy drug would have been misdosed — too high or too low — in the majority of cases modeled. None of that requires a system failure. It only requires trusting a number a patient gave from memory instead of a scale.

Finding 03

Dosing at the Kitchen Counter

Much of pediatric medicine happens outside a clinical setting entirely. A systematic review of studies on parent- and caregiver-administered medication found error rates at home ranging from roughly three in ten households to four in five, depending on the population and how “error” was defined. Risk climbed when a caregiver was a non-native speaker, was younger, or was managing a prescription containing more than two drugs at once — a combination that made instructions genuinely harder to follow correctly. The fixes identified were unglamorous but effective: dosing tools matched to the exact volume prescribed rather than generic markings, oral syringes instead of household spoons, and short caregiver education sessions. None of these require new drugs or new technology, just closing the gap between what a label says and what actually gets measured out at ten at night.

Finding 04

Alcohol, Opioids, and the Overdose Gap Between Men and Women

Overdose risk is not evenly distributed. Men die of unintentional drug overdoses at two to three times the rate of women, even though substance use itself is roughly comparable between the sexes. Research out of West Virginia — the state with the highest per-capita overdose death rate in the country — points to a specific mechanism: men are more likely to combine alcohol with opioids such as fentanyl, and because both substances independently suppress breathing, combining them compounds the danger rather than simply adding to it. Between 2005 and early 2023, researchers identified just over two thousand unintentional overdose deaths in the state involving alcohol alongside another substance; roughly three in four of those who died were men. The same research flagged a separate trend worth watching: alcohol involvement in overdose deaths among women rose during the pandemic, suggesting the gap may not hold steady going forward.

Finding 05

After the Overdose, and Beyond the Weekend

The crisis does not end at the moment of overdose. In Ontario, an average of four people a day die from suspected opioid toxicity, and of more than thirteen thousand people hospitalized after a nonfatal opioid overdose in one study period, only about one in ten went on to start evidence-based follow-up treatment, and just a third saw a primary care provider within the following month. Researchers point to consistent access to primary care, including through community pharmacists, as one of the clearest levers for closing that gap. Meanwhile, on college campuses, misuse of prescription pain relievers, stimulants, sedatives, and tranquilizers follows a pattern that runs counter to prevention messaging built around weekend parties: students were more likely to misuse these medications alone, at home, and on weekdays. Add in an aging population where patients in their late seventies and eighties take an average of ten medications regularly, and it becomes clear why adverse drug events remain one of the leading causes of death in wealthier countries — not as a rare complication, but as an ordinary hazard of ordinary care.

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Where These Figures Come From

Citation & Credibility

This article draws on peer-reviewed research and university reporting. Every figure above is attributed to its original study, and none are extrapolated beyond what the underlying research reports. Broader clinical context on the complexity of renal dose adjustment was informed by pharmacy trade literature on kidney-function-based dosing.

West Virginia University Health Affairs Institute

Research on sex differences in unintentional overdose deaths involving alcohol and opioids, published in the Journal of Studies on Alcohol and Drugs (2025).

University of Toronto, Leslie Dan Faculty of Pharmacy

Reporting on drug toxicity crisis accountability and post-overdose access to primary care, published for International Overdose Awareness Day 2025.

Southern Methodist University

Research on situational and timing patterns of prescription drug misuse among college students, published in Drug and Alcohol Dependence.

University of Oulu, Research Unit of Biomedicine and Internal Medicine

Research group description on polypharmacy, adverse drug events, and prediction of medication-related harm.

Therre M, et al., BMJ Open (2025)

“Determinants of reliability of self-reported height and weight and their impact on medication dosing,” a cross-sectional study of over 700 patients.

Peer-reviewed publication

Lopez-Pineda A, et al., Expert Opinion on Drug Safety (2021)

A systematic review on pediatric medication errors made by parents or caregivers at home.

Peer-reviewed publication

Article Tags

MisdosingMedication SafetyDrug DosingOverdose PreventionPatient SafetyPolypharmacyOpioid CrisisPharmacy ResearchKidney FunctionMedication Errors

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Editorial Note

This article is provided for general educational purposes and does not constitute medical advice. Dosing decisions are individual and should always be made in consultation with a qualified pharmacist, physician, or other licensed healthcare provider who can account for a person's specific health history. If you or someone you know may have taken too much or too little of a medication, contact a poison control center, pharmacist, or emergency services promptly.

Figures cited here reflect the studies referenced in the Citation and Credibility section and were current as of their original publication dates. This piece was compiled from peer-reviewed research and academic institutional reporting; it was not sponsored by any pharmaceutical company or manufacturer.

Written by

MedBary Team

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