# A 75-year-old client with chronic kidney disease and osteoarthritis is experiencing age-related physiological changes that affect medication metabolism. Which nursing intervention is the PRIORITY to prevent adverse drug reactions in this older adult?

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## 문제

A 75-year-old client with chronic kidney disease and osteoarthritis is experiencing age-related physiological changes that affect medication metabolism. Which nursing intervention is the PRIORITY to prevent adverse drug reactions in this older adult?

## 보기

1. Monitor for signs of drug toxicity and adjust dosing schedules based on renal function **✔ 정답**
2. Encourage the client to take all medications with food to improve absorption
3. Provide written instructions for all medications in large print format
4. Schedule all medications to be taken at the same time for convenience

**정답: 1**

## 해설

Monitoring for drug toxicity and adjusting doses based on renal function is the priority to prevent adverse reactions due to age-related changes in metabolism. Other options are less critical (e.g., written instructions aid adherence but don't prevent toxicity) or potentially harmful (e.g., taking all medications together may increase side effects).

## 심화 해설

Understanding the Physiological Context

The priority concern for this 75-year-old client stems from the intersection of age-related physiological decline and the presence of chronic kidney disease (CKD). Aging inherently alters both pharmacokinetics (what the body does to a drug) and pharmacodynamics (what the drug does to the body). A critical pharmacokinetic change is the progressive decline in renal function, which directly reduces the clearance of many medications and their active metabolites [1]. When CKD is superimposed on this age-related decline, the capacity for drug excretion is severely compromised, creating a high-risk state for drug accumulation and toxicity if standard adult doses are administered [2].

Analyzing the Priority Intervention

Monitoring for signs of drug toxicity and adjusting dosing schedules based on renal function is the priority because it directly addresses the most dangerous physiological vulnerability in this client. Age-related biologic changes and alterations to pharmacokinetic variables are primary drivers of adverse drug reactions (ADRs) [1]. In the context of multimorbidity—here, CKD and osteoarthritis—the risk of ADRs is significantly amplified, particularly when polypharmacy is involved [2]. A "one-size-fits-all" medication approach is ineffective and unsafe in older adults precisely because of these altered pharmacokinetic parameters [3]. Therefore, the nursing action that mitigates the highest risk of harm is vigilant clinical assessment for signs of toxicity combined with advocating for dose adjustments based on the client's estimated glomerular filtration rate (eGFR). This proactive surveillance is a cornerstone of safe pharmacotherapy in geriatric patients with renal impairment.

Why Other Options Are Not the Priority

While the other interventions have value in geriatric care, they do not address the most immediate, life-threatening risk of drug toxicity from impaired elimination.

-   Encouraging the client to take all medications with food to improve absorption is not a universal principle and can be dangerous. Food can alter the absorption of specific drugs, but the primary issue here is reduced drug *elimination*, not absorption. Furthermore, this action does not prevent toxicity from drugs that are already in the system.

-   Providing written instructions in large print is an excellent strategy to address sensory limitations and improve medication adherence, which is a known drug therapy problem in geriatric patients [1][3]. However, non-adherence is a secondary concern compared to the immediate physiological danger of toxicity from a correctly taken but renally-cleared medication.

-   Scheduling all medications at the same time for convenience is a strategy to simplify complex regimens and potentially improve adherence [1]. However, this approach can be outright dangerous if it leads to drug-drug interactions or peaks in drug concentration that an already compromised renal system cannot handle. The safety concern of toxicity outweighs the convenience factor.

The foundational principle is that in older adults with CKD, the body's ability to eliminate drugs is the most significantly altered and clinically impactful pharmacokinetic variable, making toxicity monitoring and dose adjustment the non-negotiable priority [1][2].References (research sources)

- [1]Identifying and Resolving Drug-Related Problems in Geriatric Patients.Research articlePeterson ME, Stollings JL, Ely EW. (2026) · DOI: 10.1177/00185787251414339

- [2]Adverse Drug Reactions and Drug Interactions in Multimorbid Patients: A Review of Current Evidence.Research articleS H, Tripathi S, Venuturumilli R, K SP, Reddy GHV, Mukherjee B, Lakhani HA. (2025) · DOI: 10.7759/cureus.97640

- [3]Advanced Drug Delivery Strategies in Geriatric Patients with Polypharmacy: Integrating Pharmacokinetics, Personalized Medicine, and Emerging Technologies.Research articleBartusik-Aebisher D, Bania K, George BP, Dynarowicz K, Aebisher D. (2026) · DOI: 10.3390/jcm15114359

## 임상 시나리오

Renal Dosing in Geriatric CKDPreventing Drug Toxicity
The priority for older adults with chronic kidney disease is to monitor for drug toxicity and adjust doses based on renal function. Age-related decline in glomerular filtration rate combined with CKD drastically reduces drug clearance, leading to accumulation.

Nursing actions include reviewing recent BUN and creatinine levels before administering medications, and watching for subtle signs of toxicity such as new-onset confusion, sedation, or gastrointestinal upset. Dosing intervals often need to be extended, not just reduced in amount.

CautionDo not rely on standard adult dosing. A "start low, go slow" approach is critical, but in CKD, the focus must also be on adjusting frequency to prevent drug accumulation from prolonged half-life.

## 핵심 개념

- **Pharmacokinetics** — The study of how the body absorbs, distributes, metabolizes, and excretes drugs; aging and CKD significantly alter drug clearance.
- **Adverse Drug Reaction (ADR)** — An unintended, harmful reaction to a medication; older adults with multimorbidity and polypharmacy are at highest risk.
- **Drug Toxicity** — Harmful effects of a drug due to excessive dosage or accumulation, often from impaired renal excretion in older adults.
- **Renal Clearance** — The volume of plasma cleared of a drug per unit time by the kidneys; declines with age and is further reduced in CKD.
- **Polypharmacy** — The use of multiple medications concurrently, common in older adults, which increases the risk of drug interactions and ADRs.

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