# Clinical context A 70-year-old client taking extended-release theophylline stopped smoking 6 days ago and started ciprofloxacin 3 days ago; repeated vomiting, tremor, agitation, an irregular heart rate of 132/min, potassium 2.9 mEq/L, and a theophylline concentration of 31 mcg/mL now suggest serious toxicity. Place the emergency actions in the safest sequence.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=522576&lang=en  
> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

Clinical context
A 70-year-old client taking extended-release theophylline stopped smoking 6 days ago and started ciprofloxacin 3 days ago; repeated vomiting, tremor, agitation, an irregular heart rate of 132/min, potassium 2.9 mEq/L, and a theophylline concentration of 31 mcg/mL now suggest serious toxicity.

Place the emergency actions in the safest sequence.

Implement poison-management recommendations and authorized treatment for dysrhythmia, seizure risk, and ongoing absorption.

Assess and support airway, breathing, circulation, cardiac rhythm, and neurologic status.

Withhold theophylline, stop the interacting medication pending review, and activate urgent assistance.

Repeat clinical assessments, rhythm review, laboratory studies, and drug concentrations until toxicity is durably resolving.

Obtain the ordered theophylline concentration, electrolytes, glucose, and acid-base studies without delaying stabilization.

## Explanation

The sequence interrupts the exposure, stabilizes vital functions, defines severity, implements toxicology-directed therapy, and checks for sustained-release rebound.

## In-depth explanation

Quick answer
Sequence interrupt, stabilize, measure, treat, and trend.

Why this is correct
Monitoring and treatment proceed together when the client is unstable; laboratory confirmation never delays airway or circulation support.

Easy analogy or mental picture
Use a closed medication-safety loop: identify the exposure, connect the new findings, interrupt further harm, support physiology, and verify the response over time.

Memory hook
Exposure, interaction, toxicity pattern, immediate action, serial reassessment.

NCLEX decision rule
Choose the action that reduces the most immediate medication-related risk while preserving monitoring and escalation.

Why the other choices are wrong
Options that continue the exposure, treat only one symptom, or delay reassessment leave the toxic process active.References
1DailyMed: Theophylline Extended-Release TabletsNarrow therapeutic range, smoking cessation, interacting medicines, toxicity manifestations, and serial concentrations
2DailyMed: Ciprofloxacin Extended-Release TabletsCYP1A2 interaction that can increase theophylline exposure and adverse effects

## Clinical scenario

Clinical context
A 70-year-old client taking extended-release theophylline stopped smoking 6 days ago and started ciprofloxacin 3 days ago; repeated vomiting, tremor, agitation, an irregular heart rate of 132/min, potassium 2.9 mEq/L, and a theophylline concentration of 31 mcg/mL now suggest serious toxicity.

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