Severe allergic reaction to drugs is known as?

Appeared in: NHM UP Staff Nurse - 2017

Explanation

Anaphylaxis is the correct term for a severe, rapid-onset, and potentially fatal systemic allergic reaction.
It is classified as a Type I hypersensitivity reaction, mediated by IgE antibodies, which trigger the release of histamine and other inflammatory mediators.
Key signs include respiratory distress (bronchospasm), cardiovascular collapse (hypotension), and skin/mucosal changes (urticaria, angioedema).
This term is highly specific, unlike 'Adverse', and describes an immune response, unlike 'Toxicity' or 'Interaction'.

Option B: Interaction refers to the alteration of a drug's effect by another substance (like another drug or food). It does not describe an allergic response.
Option C: Adverse is a very broad term for any undesirable effect of a medication. While anaphylaxis is a type of adverse reaction, it is not the specific term for a severe allergic reaction.
Option D: Toxicity refers to the harmful effects resulting from an overdose or accumulation of a drug, leading to organ damage. It is dose-dependent and not an immune-mediated reaction.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Adverse Drug Reactions and Hypersensitivity as background academic context rather than a clinical decision trigger.
Recognizing anaphylaxis is a critical nursing skill as it is a life-threatening emergency requiring immediate intervention.
The priority nursing action is to stop the offending agent and administer epinephrine immediately, as it is the only life-saving medication.
Nurses must always assess for allergies before administering any new medication and monitor patients closely after administration.

How to Approach the Question

First, analyze the keywords in the question stem: 'Severe allergic reaction'. This points to a specific type of hypersensitivity.
Evaluate each option based on its precise medical definition.
Option A, 'Anaphylaxis', specifically means a severe, systemic allergic reaction.
Option B, 'Interaction', relates to how drugs affect each other.
Option C, 'Adverse', is a general term for any negative drug effect and is too broad.
Option D, 'Toxicity', relates to overdose, not an allergic mechanism.

Concept Tested & Keywords

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E6 Nursing Fundamentals Taylor p. 842-844

E6 Pharmacology Nurses Shanbhag 3e p. 33-35

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

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