# 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. Which actions belong in the immediate safety plan? Select exactly 4 responses.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=602995&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.

Which actions belong in the immediate safety plan? Select exactly 4 responses.

Select exactly 4 responses.

1

Obtain serial theophylline concentrations, electrolytes, glucose, and acid-base assessment as ordered.

2

Correct the potassium, then continue theophylline at half the dose without toxicology review.

3

Withhold additional theophylline and urgently notify the prescribing and toxicology teams.

4

Treat the vomiting with an antiemetic and defer repeat theophylline concentrations until symptoms improve.

5

Place the client on continuous cardiac monitoring and institute seizure precautions.

6

Support airway and circulation and correct authorized electrolyte abnormalities while preparing toxicity-directed treatment.

## Explanation

The immediate plan stops further exposure, supports airway and circulation, detects dysrhythmia or seizure, trends theophylline and metabolic abnormalities, and follows toxicology guidance.

## In-depth explanation

Quick answer
Use hold, monitor, support, trend, and escalate.

Why this is correct
Sustained-release exposure and altered clearance can produce prolonged or recurrent toxicity, so one improving symptom does not close the emergency.

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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