As people live longer and accumulate more chronic health conditions, medication lists often grow with them. While modern medicines have transformed the management of diseases such as diabetes, heart failure, and hypertension, there is an important downside: polypharmacy, commonly defined as the use of five or more medications at the same time.
Although frequently viewed as a routine consequence of managing multiple illnesses, polypharmacy has emerged as a significant and often underrecognized patient safety issue. Research consistently shows that taking multiple medications increases the risk of adverse drug events, emergency department (ED) visits, hospitalizations, and even death—particularly among older adults.
The Growing Scope of the Problem
Medication-related harm is a major contributor to healthcare utilization worldwide. In the United States, millions of patients experience adverse drug events each year, with older adults carrying a disproportionate share of the burden.
Adults aged 65 years and older experience medication-related emergency visits at more than twice the rate of younger populations. Among older adults who present to the ED because of medication-related complications, nearly half require hospitalization. Studies further estimate that approximately 8% of emergency admissions and nearly 14% of inpatient admissions are attributable to adverse drug reactions, with many of these events considered potentially preventable.
The connection between polypharmacy and hospitalization is particularly striking. Patients exposed to multiple medications have been shown to have more than double the risk of hospitalization due to adverse drug reactions compared with those taking fewer medications.
Which Medications Cause the Most Harm?
Not all medications contribute equally to risk. A relatively small number of drug classes account for the majority of serious medication-related emergencies in older adults.
Anticoagulants
Blood thinners such as warfarin, rivaroxaban, and dabigatran are among the leading causes of medication-related hospital admissions. While these drugs are highly effective for preventing stroke and treating blood clots, they can also cause serious bleeding complications, including gastrointestinal and intracranial hemorrhage.
Diabetes Medications
Insulin and oral diabetes medications remain a common source of emergency visits. Severe hypoglycemia can lead to confusion, falls, seizures, loss of consciousness, and other neurologic complications that often require urgent medical care.
Opioid Analgesics
Prescription opioids continue to contribute significantly to medication-related harm through sedation, respiratory depression, falls, fractures, and overdose.
Other High-Risk Medications
Additional drug classes frequently implicated in serious adverse events include:
- Nonsteroidal anti-inflammatory drugs (NSAIDs)
- Antiplatelet agents and other antithrombotics
- Renin-angiotensin system inhibitors
- Benzodiazepines and sedative-hypnotics
These medications often become particularly dangerous when combined with other therapies or prescribed to patients with multiple chronic illnesses.
The Danger of Drug–Drug Interactions
Beyond the risks posed by individual medications, polypharmacy increases the likelihood of harmful drug–drug interactions.
Certain medication combinations are especially concerning:
- ACE inhibitors or diuretics combined with glucocorticoids, which may increase the risk of hospitalization
- Diabetes medications combined with fluoroquinolone antibiotics, increasing the risk of severe blood sugar abnormalities
- Selective serotonin reuptake inhibitors (SSRIs) combined with NSAIDs in patients with a history of bleeding, significantly elevating hemorrhage risk
Research suggests that exposure to contraindicated medication combinations substantially increases the likelihood of emergency hospitalization, highlighting how careful medication review can prevent avoidable harm.
Why Is Polypharmacy Becoming More Common?
Several factors are driving the steady rise in polypharmacy:
An Aging Population
Older adults are more likely to have multiple chronic conditions requiring long-term treatment. Managing hypertension, diabetes, cardiovascular disease, arthritis, osteoporosis, and other illnesses often results in complex medication regimens.
Disease-Specific Guidelines
Clinical guidelines are typically designed around individual diseases. While these recommendations are evidence-based, following several guidelines simultaneously can lead to the accumulation of numerous medications without sufficient consideration of the overall medication burden.
Fragmented Healthcare
Patients frequently receive care from multiple specialists, each focused on a specific condition. Without effective coordination, medications may be added without reassessing whether existing therapies remain necessary.
Healthcare System Challenges
Automated prescription refills, outdated medication records, and limited opportunities for comprehensive medication review can allow unnecessary medications to persist for years.
As a result, an estimated 30–40% of adults over age 65 take at least five medications, while approximately 12% take ten or more.
How Clinicians Identify Problematic Medications
Recognizing potentially inappropriate medications is an important first step in reducing medication-related harm.
Several validated assessment tools are widely used:
AGS Beers Criteria
The Beers Criteria provides an evidence-based list of medications that may be inappropriate or high risk in older adults.
STOPP/START Criteria
This tool evaluates both inappropriate prescribing and important medication omissions, helping clinicians optimize treatment plans.
Medication Appropriateness Index
Rather than relying on a fixed list of medications, this approach assesses whether each individual prescription remains appropriate for a specific patient.
ARMOR Framework
ARMOR—Assess, Review, Minimize, Optimize, and Reassess—offers a structured process for evaluating medication regimens and reducing unnecessary treatment burden.
While no single tool has demonstrated clear superiority in improving outcomes, each can support safer prescribing practices and more thoughtful medication management.
Deprescribing: A New Approach to Medication Safety
One of the most important developments in modern medication management is the concept of deprescribing.
Deprescribing is not simply stopping medications. It is a deliberate, evidence-based process that seeks to reduce or discontinue drugs when the potential harms outweigh the expected benefits.
A widely adopted five-step deprescribing framework includes:
- Compile a complete and accurate medication list.
- Assess the patient’s overall risk of medication-related harm.
- Evaluate the benefits and risks of each medication.
- Prioritize medications with the least favorable benefit-to-risk ratio for discontinuation.
- Implement a tapering or discontinuation plan with appropriate monitoring.
Importantly, studies suggest that most older adults are receptive to deprescribing conversations. When physicians recommend reducing medication burden, the majority of patients are willing to consider stopping one or more medications.
Professional organizations increasingly recognize deprescribing as a core component of caring for patients with multiple chronic conditions rather than as a last resort.
The Emergency Department’s Role
Emergency departments are often the first point of contact when medication-related harm occurs. This places ED clinicians in a unique position to identify polypharmacy and intervene before further complications develop.
Modern geriatric emergency care guidelines increasingly recommend:
- Screening for polypharmacy and high-risk medications
- Comprehensive medication reconciliation
- Pharmacist involvement in medication review
- Collaboration with geriatric specialists
- Careful assessment of new prescriptions before discharge
These interventions are especially important because many older adults leave the ED with additional medications, potentially compounding existing risks.
Looking Ahead
Polypharmacy represents one of the most significant—and potentially preventable—contributors to medication-related emergencies among older adults. As populations age and chronic disease management becomes increasingly complex, healthcare systems must move beyond simply prescribing medications and place equal emphasis on evaluating whether each medication remains necessary.
Routine medication reviews, the use of validated prescribing assessment tools, and structured deprescribing initiatives offer practical, evidence-based strategies for reducing preventable emergency visits and hospitalizations.
Ultimately, the goal is not fewer medications for the sake of fewer medications. Rather, it is ensuring that every medication a patient takes continues to provide more benefit than harm—a principle that lies at the heart of safe, patient-centered care.
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