# Clinical context A client with chronic kidney disease is receiving flucytosine for a serious fungal infection; the nurse compares renal dosing, serum concentration, blood counts, and liver findings before the next dose. A client with chronic kidney disease is receiving flucytosine. Highlight the findings that require prompt toxicity follow-up.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=522877&lang=en  
> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

Clinical context
A client with chronic kidney disease is receiving flucytosine for a serious fungal infection; the nurse compares renal dosing, serum concentration, blood counts, and liver findings before the next dose.

A client with chronic kidney disease is receiving flucytosine. Highlight the findings that require prompt toxicity follow-up.

| Domain | Finding |
| --- | --- |
| Renal dosing | Creatinine clearance fell to 22 mL/min without an interval adjustment |
| Drug level | Serum flucytosine concentration is 55 mcg/mL within the prescribed monitoring range. |
| Blood count | White blood cells 1,200/mm3 and platelets 42,000/mm3 |
| Renal dosing | A renal-adjusted dosing interval is documented and creatinine is stable. |
| Drug level | Serum flucytosine concentration is above the prescribed monitoring range |
| Hepatic | New jaundice with rapidly rising aminotransferases |
| Assessment | Mild nausea after the dose improves when the capsule is taken with food. |
| Blood count | White blood cells are 6,200/mm3 and platelets are 210,000/mm3. |

## Explanation

Renal accumulation, an excessive serum concentration, new cytopenias, and liver injury require prompt flucytosine dose and toxicity evaluation.

## In-depth explanation

Quick answer
Link kidney clearance to serum level, marrow, and liver toxicity.

Why this is correct
Flucytosine is primarily eliminated by the kidneys. Accumulation can produce severe leukopenia, thrombocytopenia, hepatic injury, and gastrointestinal toxicity, so renal dosing and concentration monitoring are essential.

Easy analogy or mental picture
Build a medication-safety chain: identify the new cue, connect it to the drug mechanism or labeled limitation, stop preventable exposure, stabilize the client, and verify a measurable response.

Memory hook
Drug, urgent cue, protective action, and reassessment endpoint.

NCLEX decision rule
Choose the action that prevents the most immediate medication-related harm while preserving indicated treatment and required monitoring.

Why the other choices are wrong
Options that continue a suspect exposure, normalize a labeled danger cue, substitute an unauthorized dose, or delay escalation leave the client at risk.References
1DailyMed: Flucytosine CapsulesRenal dose adjustment, serum concentration monitoring, bone-marrow suppression, and hepatic toxicity

## Clinical scenario

Clinical context
A client with chronic kidney disease is receiving flucytosine for a serious fungal infection; the nurse compares renal dosing, serum concentration, blood counts, and liver findings before the next dose.

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