# Thirty minutes after IV vancomycin is started, a client develops flushing of the face and upper torso, pruritus, a maculopapular rash, and mild hypotension. The airway is patent and oxygen saturation is 98%. Which actions are appropriate? Select all that apply.

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> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

Thirty minutes after IV vancomycin is started, a client develops flushing of the face and upper torso, pruritus, a maculopapular rash, and mild hypotension. The airway is patent and oxygen saturation is 98%. Which actions are appropriate? Select all that apply.

1

Label the event as anaphylaxis and give IM epinephrine before assessing the airway, breathing, circulation, and full reaction pattern

2

Give the prescribed antihistamine and, after symptoms resolve, restart as ordered at a slower rate; infuse future doses no faster than the medication and facility protocol allow

3

Stop the infusion immediately and assess the airway, breathing, circulation, vital signs, skin findings, and evidence of anaphylaxis

4

Give a corticosteroid before every future dose while continuing the same rapid infusion rate because the rate does not influence recurrence

5

Restart the medication at the original rate as soon as flushing improves because slower administration reduces antibacterial activity

6

Record vancomycin as a permanent IgE-mediated allergy and require replacement with another antibiotic without discussing the reaction with the prescriber

## Explanation

The presentation is consistent with a vancomycin infusion reaction, a rate-related, non-IgE-mediated reaction, but the nurse must first stop the infusion and assess airway, breathing, circulation, vital signs, skin findings, and features that would suggest anaphylaxis (Choice 3). For an uncomplicated infusion reaction, an ordered antihistamine may be given and vancomycin may be restarted after symptoms resolve at a slower prescribed rate; FDA labeling notes fewer reactions at rates of 10 mg/min or less, although reactions can occur at any rate (Choice 2). Epinephrine is used for anaphylaxis, not automatically before assessment of this stable presentation (Choice 1). Continuing the same rapid rate, restarting at the original rate, or relying on routine corticosteroid premedication does not correct the cause (Choices 4 and 5). Document the exact reaction and notify the prescriber; do not automatically misclassify a non-IgE infusion reaction as a permanent IgE-mediated allergy (Choice 6).

## In-depth explanation

Clinical Judgment
Red Man Syndrome looks like an allergic reaction but is rate-dependent histamine release, not anaphylaxis. The differentiator is the airway: RMS preserves the airway and oxygenation; anaphylaxis does not. The intervention path differs accordingly.

Memory Tip
RMS rule = Stop, Look, Soothe, Slow: Stop the infusion · Look at the airway and vitals · Soothe with diphenhydramine · Slow the rate to ≥ 60 minutes per gram (often 90–120 minutes after a reaction).

KR vs US
Korean wards sometimes infuse a 1 g vancomycin dose in 30 to 45 minutes for scheduling reasons. NCLEX-RN expects the nurse to know that 1 g over at least 60 minutes is the minimum, and longer for higher doses. Slowing the rate is the single most effective preventive action.

## Clinical scenario

Clinical Practice Guide
IDSA and CDC vancomycin dosing guidance: infuse 1 g over at least 60 minutes; doses above 1 g (or 15 mg/kg) require proportionally longer infusion (90–120 minutes for a 1.5 g dose, 2 hours or more for 2 g). Trough goal 15–20 mcg/mL for severe MRSA infections. Prevention of Red Man Syndrome focuses on rate; diphenhydramine pre-treatment is selectively added.

Caution
Common NCLEX traps: labeling Red Man Syndrome as anaphylaxis, giving epinephrine, stopping vancomycin permanently, and adding routine corticosteroid premedication. Remember: RMS is rate, not immune — slow the drip and most patients tolerate it.

## Key concepts

- **Red Man Syndrome (Vancomycin Flushing Reaction)** — Non-IgE-mediated, infusion-rate-dependent reaction caused by direct degranulation of mast cells with histamine release. Presents with flushing, pruritus, maculopapular rash on the face, neck, and upper trunk, sometimes mild hypotension and chest or back pain. Airway and oxygenation remain intact. NCLEX exam tip: it is not anaphylaxis — do not give epinephrine and do not permanently discontinue the drug.
- **Vancomycin Infusion Rate** — Standard infusion: 1 g IV over at least 60 minutes; doses above 1 g require proportionally longer infusion (typically 60 minutes per gram or 10 mg/min, whichever is slower). After a Red Man Syndrome reaction, slow the next dose to at least 90 to 120 minutes. NCLEX exam tip: any option that infuses 1 g vancomycin in 30 to 45 minutes is wrong.
- **Diphenhydramine for RMS** — First-line pharmacologic treatment for Red Man Syndrome. The H1-antihistamine blocks histamine effects after mast cell degranulation. Dosing: 25 to 50 mg IV or PO. Some protocols also add an H2-blocker. Routine corticosteroid premedication is not standard. NCLEX exam tip: the priority is to stop the infusion first, then administer diphenhydramine after assessment.

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