What is a severe allergic reaction to a drug called?

Appeared in: UP CHO - 2018

Explanation

Anaphylaxis is the specific medical term for a severe, rapid-onset, and potentially fatal systemic allergic reaction.
It is classified as a Type I hypersensitivity reaction, which is mediated by IgE antibodies.
Upon exposure to an allergen (like a drug), mast cells and basophils release large amounts of inflammatory mediators (e.g., histamine), leading to life-threatening symptoms.
Key features include respiratory distress (bronchospasm, laryngeal edema), cardiovascular collapse (hypotension, shock), and skin/mucosal involvement (urticaria, angioedema).

Option B: Interaction refers to the alteration of a drug's effects by another substance, not an immune-mediated allergic response.
Option C: Adverse reaction is a very broad term for any unintended and harmful effect of a drug. It is not specific enough for a 'severe allergic reaction'.
Option D: Toxicity is a dose-dependent phenomenon where a drug's concentration exceeds the therapeutic range, causing predictable harm. It is not an allergic (immune) reaction.

Clinical Relevance

Nursing practice connection: Knowing Adverse Drug Reactions and Hypersensitivity helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Recognizing anaphylaxis is a critical nursing skill. Early signs like sudden-onset hives, difficulty breathing, or swelling of the lips/tongue after administering a new drug require immediate action.
The nurse's primary role is to stop the causative agent, call for help (e.g., a rapid response team), and administer epinephrine as prescribed or per protocol. Time is critical to prevent fatal outcomes.
Patient education is vital. Nurses must teach patients with known severe allergies to carry and use an epinephrine auto-injector and to inform all healthcare providers of their allergy.

How to Approach the Question

First, identify the key terms in the question: 'severe' and 'allergic reaction'. This indicates you are looking for a specific, serious condition.
Evaluate each option based on these keywords.
Analyze 'Anaphylaxis'. Recall or deduce that this is the specific term for a severe, life-threatening allergic reaction.
Analyze 'Interaction'. This relates to how drugs affect each other, not an allergic response to a single drug.
Analyze 'Adverse'. This is a general term. While anaphylaxis is an adverse reaction, 'adverse' is not specific enough for a 'severe allergic' one.
Analyze 'Toxicity'. This relates to overdose or poisoning, which is a different mechanism from an allergic reaction. Conclude that 'Anaphylaxis' is the most precise and correct answer.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor p. 842-844

E6 Pharmacology Nursing Lilley 11e Part 1 p. 49-51

E6 Pharmacology Nurses Shanbhag 3e p. 33-35

Practise the full UP CHO - 2018

Attempt every question from this paper in a timed mock, then review the full solution for each one.