# A 78-year-old client weighing 72 kg has a culture-supported complicated intra-abdominal infection, creatinine clearance of 39 mL/min, a new meropenem 1 g IV every-8-hours order, and chronic divalproex therapy for a seizure disorder. Review the admission record and highlight the findings that require clarification before the first meropenem dose.

> source: MyMerci (mymerci.kr)  
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> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

A 78-year-old client weighing 72 kg has a culture-supported complicated intra-abdominal infection, creatinine clearance of 39 mL/min, a new meropenem 1 g IV every-8-hours order, and chronic divalproex therapy for a seizure disorder. Review the admission record and highlight the findings that require clarification before the first meropenem dose.

Admission Record
A 78-year-old man weighing 72 kg is admitted with a culture-supported complicated intra-abdominal infection. Serum creatinine is 1.6 mg/dL, and the Cockcroft-Gault calculation is 39 mL/min. The prescription is meropenem 1 g IV every 8 hours. Home medications include divalproex sodium 500 mg twice daily for a seizure disorder. The last valproate level was 72 mcg/mL. He is alert and oriented, with BP 126/70 mm Hg, SpO2 97 percent on room air, and no beta-lactam allergy.

## Explanation

The calculated creatinine clearance of 39 mL/min, the every-8-hour meropenem order, and chronic divalproex therapy require clarification before administration.

## In-depth explanation

Quick answer
Clarify the renal interval and the valproate interaction before giving meropenem.

Why this is correct
For an adult with creatinine clearance 26 to 50 mL/min, the labeled meropenem interval is every 12 hours rather than every 8 hours. Concomitant valproic acid or divalproex is generally not recommended because meropenem can rapidly lower valproate concentrations and increase breakthrough seizure risk.

Easy analogy or mental picture
Two independent warning lights are on: the kidney cannot clear the traffic at the usual interval, and the antibiotic can remove the seizure-control guardrail.

Memory hook
CrCl 50 or lower: adjust; valproate plus meropenem: stop and review.

NCLEX decision rule
Before a renally cleared high-risk drug, calculate clearance and reconcile interacting therapy. Do not administer first and investigate later.

Why the other choices are wrong
A stable blood pressure, normal oxygenation, and a susceptible culture support treatment but do not make an unsafe interval or interaction acceptable.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

Meropenem pre-dose safety screen
Weight the renal-clearance calculation and carbapenem-valproate interaction against otherwise reassuring infection and assessment data.

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