When Medication Causes More Harm Than Good
Every prescription comes with a list of potential side effects. Most patients glance at it, note the warnings about drowsiness or nausea, and move on. The serious entries — liver damage, kidney failure, severe allergic reaction — feel remote. These are the rare outcomes, the statistical outliers, the things that happen to other people.
Except that they happen with considerable regularity. And when they do, they are often not recognized as medication-related — because the symptoms of a drug side effect can look exactly like a new medical problem, because physicians managing multiple conditions across multiple medications don't always have the time or the complete information to make the connection, and because patients themselves rarely think to report a new symptom to the physician who prescribed the drug that's causing it.
Adverse drug reactions are among the most common causes of preventable harm in medicine. Studies suggest they account for roughly 5% of all hospital admissions in the United States, and they are disproportionately prevalent among older adults managing multiple medications. They are also, when recognized, among the most correctable problems in healthcare. The treatment is frequently as simple as stopping or changing the offending medication.
The challenge is recognizing them in time.
The Case of the Medication That Was Destroying a Kidney
The patient had been managing a health condition with a medication that, in his specific situation and at his specific dose, was producing a serious and progressive consequence: acute renal failure. His kidney function was declining — measurably, in his laboratory results, over time. But the connection between the medication and the decline had not been identified.
From the outside, this might seem like an obvious thing to catch. If a patient starts a medication and their kidney function begins to deteriorate, the temporal relationship should raise a flag. In practice, it often doesn't — for reasons that illuminate how medication-related harm goes unrecognized.
Kidney function tends to decline gradually rather than dramatically, at least in the early stages. The changes show up in blood work — rising creatinine levels, declining estimated glomerular filtration rate — but borderline abnormalities in a busy clinical environment don't always receive the same attention as acute, symptomatic events. A result that falls just outside the normal range may be noted as "slightly elevated" and flagged for monitoring, without the next question being asked: what has changed recently that could explain this?
When Pilot Rock Medical Navigators reviewed this patient's case, the answer to that question was visible in the record. The medication, the timeline, the laboratory trend — together, they told a coherent story that had not been assembled when the results were reviewed individually and in isolation. The identification of the connection meant the medication could be changed before the kidney damage became permanent.
The patient avoided what could have been a lasting and significant consequence — not through heroic intervention, but through the kind of careful, comprehensive record review that connected dots that had been sitting in plain view.
The Osteoporosis Case: A Less Harmful Path
The second case is a different kind of story — not a crisis averted, but an unnecessary risk avoided before it became one.
A patient with osteoporosis had been prescribed a medication for the condition — an appropriate treatment for a real diagnosis. But when Pilot Rock reviewed the case, the team identified a concern: the specific medication prescribed carried a risk profile that, given this patient's circumstances, made it a less optimal choice than alternatives available for the same condition.
Dr. Sadock brought this to the attention of the prescribing clinician — not as a confrontation, but as a clinical observation grounded in the evidence. The clinician reviewed the reasoning, agreed with the assessment, and changed the prescription to a medication that achieved the same therapeutic goal with a meaningfully lower risk of adverse effects.
This case illustrates something important about how medication-related harm often works: it doesn't always show up as an acute crisis. Sometimes it shows up as a risk that hasn't yet materialized — a prescription that is appropriate in general but less optimal for a specific patient, given their age, their other medications, their kidney or liver function, or other individual factors that shape how a drug behaves in their body.
Changing a medication before harm occurs is not the same as catching a crisis, but it is equally important. The harm that never happens because a better choice was made is invisible — which is why it is so rarely credited and so easily overlooked as a category of medical value.
How Medication Side Effects Go Unrecognized
The underrecognition of adverse drug reactions is not a failure of individual physicians. It is a predictable outcome of several structural features of how medication management happens in modern healthcare.
Polypharmacy — the use of multiple medications simultaneously — is the most significant contributing factor. A patient taking five, eight, or ten medications is taking a complex pharmacological cocktail in which the interactions between drugs, and between drugs and individual physiology, are difficult to fully predict or monitor. Each medication was likely prescribed by a physician who had clear reasons for doing so, but no single physician may be tracking the full list and its cumulative effects. The cardiologist adjusts the heart medication without full visibility into what the rheumatologist prescribed last month. The primary care physician renews prescriptions that were initiated by specialists years ago without reassessing whether they are still appropriate.
The temporal gap between starting a medication and experiencing its effects is another factor. Some side effects are immediate and obvious. Others develop gradually over weeks or months, by which time the connection to the medication that triggered them is less salient to both the patient and the physician. A patient who developed fatigue three months after starting a new drug may not think to connect the two, and the physician who sees them for a different complaint may not ask.
Symptom attribution is a related phenomenon. When a patient on multiple medications develops a new symptom, the temptation — for both patient and physician — is to attribute it to a disease process rather than to a treatment. A patient with rheumatoid arthritis who develops gastrointestinal symptoms may have those symptoms attributed to the disease, when they may actually be caused by a medication used to treat it. A patient with chronic kidney disease whose function is worsening may have the decline attributed to disease progression, when a medication is actually responsible.
Underreporting by patients plays a role as well. Patients often don't report new symptoms to their physician, either because they assume the symptoms are unrelated to their medication, because they don't want to seem like they're complaining, or because they simply don't connect the two. The physician who prescribed the medication may never learn about the symptom that could have led them to reconsider it.
The Particular Risk for Older Adults
Adverse drug reactions are more common in older adults than in any other population, for reasons that are both pharmacological and systemic.
As the body ages, the mechanisms by which drugs are processed change. Kidney and liver function typically decline with age, meaning that medications are cleared from the body more slowly and can accumulate to higher levels than in younger patients. Body composition changes affect how drugs are distributed in tissues. The sensitivity of certain receptors and systems to drug effects increases. These physiological changes mean that a dose that was appropriate for a 55-year-old may produce significantly different — and potentially harmful — effects in the same person at 75.
Older adults are also more likely to be taking multiple medications, often prescribed by multiple physicians across multiple specialties, without comprehensive coordination. The Beers Criteria — a list of medications considered potentially inappropriate for older adults, developed by the American Geriatrics Society — identifies dozens of commonly prescribed drugs that carry elevated risk in this population. Many of these medications are still widely prescribed to older adults, often because no one has stepped back to evaluate whether the benefits still outweigh the risks given the patient's current age and health status.
The consequences of unrecognized adverse drug reactions are more serious in older adults as well. A fall caused by a medication producing dizziness or orthostatic hypotension — a drop in blood pressure on standing — can result in a fracture with significant consequences for mobility and independence. Cognitive changes caused by anticholinergic medications can be mistaken for dementia. Kidney damage from a nephrotoxic drug in an older adult with already-reduced renal reserve can progress quickly and permanently.
For families managing the care of aging parents, a comprehensive medication review — assessing not just what medications are being taken, but whether each is still appropriate, whether the combination is safe, and whether any current symptoms could be medication-related — is one of the highest-value interventions available.
Recognizing the Signs That a Medication May Be Causing Harm
Patients and families who know what to look for are better positioned to identify a potential adverse drug reaction before it becomes severe. Some specific guidance:
Pay close attention to timing. New symptoms that develop within days, weeks, or even months of starting a new medication — or of changing a dose — deserve consideration as potentially medication-related. The connection isn't always obvious, particularly when the symptom develops gradually, but the temporal relationship is the starting point.
Track symptoms systematically. A log or journal that records when new symptoms appear, how they have changed over time, and what other changes (in medications, diet, or activity) happened around the same time gives both the patient and their physician more to work with. Memory of when a symptom started and how it has evolved is often unreliable; a written record is not.
Tell all of your prescribing physicians about all of your medications. This sounds obvious, and yet incomplete medication disclosure is one of the most common contributing factors in unrecognized drug interactions and adverse events. Every physician involved in a patient's care should have an accurate, complete, current medication list — including over-the-counter medications, supplements, and herbal products, which can interact with prescription drugs in clinically significant ways.
Ask specifically about medication side effects when a new prescription is given. Rather than relying on the package insert, asking the prescribing physician directly — what should I watch for with this medication, and how quickly should I expect to see it? — provides more targeted guidance. Asking also whether any of your existing medications interact with the new one gives the physician an opportunity to flag concerns that might not otherwise come up.
Don't assume a new symptom is a new disease. When something changes after a medication change, the medication is a hypothesis worth considering. Bringing new symptoms explicitly to the attention of the prescribing physician — "I started experiencing this around the time I began that medication" — opens the door to a conversation that might not happen otherwise.
The Value of a Medication Review
For patients managing multiple medications, particularly older adults or those with complex conditions, a dedicated comprehensive medication review — conducted by a physician with the time and the complete information to evaluate the full list in context — is one of the most protective things that can be done.
Such a review asks questions that routine appointments often don't: Is each medication still indicated? Has the patient's health status changed in ways that affect the risk-benefit calculation for any of these drugs? Are there interactions between medications on the list? Are there symptoms the patient is experiencing that could be medication-related? Are there medications on the Beers Criteria or other high-risk lists that should be reconsidered given the patient's age and profile?
When Pilot Rock Medical Navigators conducts a record review for patients with complex medication histories, this kind of assessment is built into the process. The kidney failure case — where the connection between a medication and progressive organ damage was identified through careful review of laboratory trends alongside the medication timeline — and the osteoporosis case — where a safer alternative was identified before harm occurred — represent the two ways this kind of review produces value: catching harm that is already developing, and preventing harm that hasn't happened yet.
Both are worth preventing. The harm that is caught before it becomes permanent, and the harm that never occurs because a better choice was made, are the quiet successes of careful, comprehensive medical oversight — the kind that the standard system, for all its capabilities, rarely has time to provide.
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If you or a loved one is managing multiple medications or has developed new symptoms that may be related to a prescription, Pilot Rock Medical Navigators can help review the full picture. Book a free 15-minute introductory call to discuss your situation. Learn how Pilot Rock can help →