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Adverse drug reactions - allergy? side-effect? intolerance?
1Department of Clinical Immunology and Allergy, Royal Adelaide Hospital, South Australia. william.smith@health.sa.gov.au.
Australian Family Physician
|March 27, 2013
Summary
Understanding adverse drug reactions (ADRs) is crucial for patient safety. This overview helps differentiate drug allergies, side-effects, and intolerances to guide future medication choices.
Area of Science:
- Pharmacology
- Clinical Toxicology
- Immunology
Background:
- Adverse drug reactions (ADRs) encompass a wide spectrum, from severe anaphylaxis to mild side effects.
- Accurate assessment of ADRs is essential for patient management and drug safety.
Purpose of the Study:
- To provide an overview on the assessment of adverse drug reactions (ADRs).
- To differentiate between drug allergy, side-effect, and intolerance.
- To discuss implications for future drug use or avoidance.
Main Methods:
- Review of clinical features suggestive of different types of ADRs.
- Analysis of the implications of ADR classification for clinical decision-making.
- Consideration of the role of ADR mechanisms in risk assessment.
Main Results:
- Drug allergy involves immunological mechanisms, can be severe, reproducible, and may exhibit cross-reactivity.
- Drug side-effects are common, predictable, and related to the drug's pharmacology.
- Drug intolerance is typically less severe and influenced by individual susceptibility.
Conclusions:
- Assessment of ADRs informs decisions on drug cessation or re-challenge.
- Understanding the mechanism (allergy, side-effect, intolerance) aids in risk stratification.
- Careful risk-benefit assessment is necessary when re-prescribing drugs with a history of ADRs.
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