# A 78-year-old client with creatinine clearance of 39 mL/min and chronic divalproex therapy had a meropenem 1 g every-8-hours order held before the first dose. After prescriber, pharmacist, and neurology review, meropenem 1 g every 12 hours and a seizure-protection plan were documented because no equally appropriate alternative was available. Review the treatment trend and select the best outcome interpretation and ongoing plan.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=514118&lang=en  
> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

A 78-year-old client with creatinine clearance of 39 mL/min and chronic divalproex therapy had a meropenem 1 g every-8-hours order held before the first dose. After prescriber, pharmacist, and neurology review, meropenem 1 g every 12 hours and a seizure-protection plan were documented because no equally appropriate alternative was available. Review the treatment trend and select the best outcome interpretation and ongoing plan.

| Time | Data |
| --- | --- |
| Before first dose | CrCl 39 mL/min; meropenem 1 g every 8 hours held; chronic divalproex documented |
| After review | Culture and allergy profile reviewed; meropenem 1 g every 12 hours authorized; neurology plan documented because no equally appropriate alternative is available |
| 24 hours | CrCl 41 mL/min; alert and oriented; no tremor, myoclonus, or seizure; temperature decreased from 38.5 C to 37.8 C |
| 48 hours | CrCl 44 mL/min; WBC decreased from 15,200 to 11,300/mm3; abdominal pain improved; no neurologic change |

Q1. How should the outcome be interpreted?

Renal and neurologic toxicity is progressing
The infection is improving while renal and neurologic status remain stable
The regimen failed because creatinine clearance is below 50 mL/min

Q2. Which ongoing plan is appropriate?

Return to every-8-hour dosing because the temperature decreased
Stop all antimicrobial therapy immediately
Continue the verified every-12-hour regimen and serial renal, neurologic, and seizure-control monitoring
Stop neurologic assessment because no seizure occurred in 48 hours

## Explanation

The revised every-12-hour regimen matches the 26-to-50 mL/min renal band, renal function and neurologic status remain stable, and seizure control is preserved under the documented monitoring plan.

## In-depth explanation

Quick answer
The plan is currently effective and safer: continue the verified renal interval and ongoing renal, neurologic, and seizure-control surveillance.

Why this is correct
A creatinine clearance of 39 to 44 mL/min remains in the labeled every-12-hour band. Stable orientation, absence of myoclonus or seizures, improving infection findings, and a stable alternative antiseizure plan support the outcome without eliminating the need for monitoring.

Easy analogy or mental picture
A corrected route with steady dashboard readings is progress, but the dashboard stays on for the full trip.

Memory hook
Right interval plus stable kidney, brain, and infection trend means continue and watch.

NCLEX decision rule
Evaluate both therapeutic response and toxicity prevention. A single normal value does not replace serial organ-function and neurologic assessment.

Why the other choices are wrong
Returning to every 8 hours ignores the current clearance; stopping all therapy ignores the improving but still active infection.References
1DailyMed: Meropenem for InjectionCockcroft-Gault renal schedule, seizure potential, and valproate interaction
2Valproate Interaction With Carbapenems: Review and RecommendationsPeer-reviewed synthesis of subtherapeutic valproate and breakthrough seizure risk

## Clinical scenario

Post-clarification renal and neurologic trend
Evaluate infection response without mistaking early stability for permission to stop renal, neurologic, and seizure-control monitoring.

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