# A client receives a subcutaneous omalizumab injection in the clinic for severe allergic asthma. Which post-administration practice most reflects the FDA boxed warning?

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> url: https://mymerci.kr/pages/nclex_q.php?qn_id=391797&lang=en  
> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

A client receives a subcutaneous omalizumab injection in the clinic for severe allergic asthma. Which post-administration practice most reflects the FDA boxed warning?

## Option

1. Discharge the client within 5 minutes after injection, instructing them to self-monitor for signs of anaphylaxis at home and to call 911 if symptoms develop; no in-clinic observation or emergency supplies required.
2. Arrange for a home health nurse to administer omalizumab at the client's home, instruct the client to remain for 30 minutes after injection and to call 911 if any signs of anaphylaxis develop; no emergency supplies needed.
3. Pre-medicate with oral diphenhydramine 50 mg 30 minutes before injection, then observe for 15 minutes and discharge with instructions to monitor for delayed symptoms; no emergency supplies or extended observation necessary.
4. Observe in the clinic for at least 2 hours after the first several doses (and at least 30 minutes thereafter), with anaphylaxis emergency supplies immediately available; counsel about delayed reactions up to 24 hours **✔ Correct answer**

**Correct answer: 4**

## Explanation

Correct (2): Omalizumab carries an FDA boxed warning for anaphylaxis — life-threatening, can occur with first or any subsequent dose, sometimes delayed up to 24 hours. Observation in a healthcare setting (2 hours initially, 30 minutes for stable later doses) with anaphylaxis kit ready. Self-injectable epinephrine (Auto-Injector) is provided to patient. (1,3) Unsafe. (4) Pre-medication does not eliminate anaphylaxis risk.

## In-depth explanation

Memory Tip Omalizumab (anti-IgE) = "Anti-IgE = Anaphylaxis warning." All biologic asthma agents (omalizumab, mepolizumab, benralizumab, dupilumab) carry hypersensitivity warnings.

## Clinical scenario

Scenario 28-year-old female with severe allergic asthma receiving omalizumab 300 mg SC every 4 weeks. Clinic-administered.

## Key concepts

- **Omalizumab** — Monoclonal anti-IgE antibody for severe allergic asthma and chronic urticaria.
- **Anaphylaxis monitoring** — Post-injection observation for biologics due to anaphylaxis risk; immediate epinephrine availability.
- **Biologic asthma therapy** — Add-on for severe asthma — omalizumab, mepolizumab, benralizumab, reslizumab, dupilumab.

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