The WHO defines an "Adverse Drug Reaction as any response to a drug which is noxious and unintended and which occurs or doses normally used in a man of prophylaxis diagnosis or therapy of disease or for the modification of physiologic function."
Adverse Drug Reactions (ADRs) are types of Adverse Drug Events (ADEs). Adverse Drug Events include ADRs, prescription errors, medication errors and other drug-related problems. ADEs are the negative consequences’ of drug misadventures. Henri Manasse defined drug misadventure as the iatrogenic hazard that is an inherent risk when drug therapy is indicated.
The American Society of Health-System Pharmacists (ASHP) defines significant ADRs as an unexpected, unintended, undesired, or excessive response to a drug that includes the following.
Table of Contents
1. Definition
2. Incidence
3. Classification of Adverse Drug Reactions
4. Drug Hypersensitivity
5. Immunologic and Non-Immunologic Drug Reactions
6. Immune Reaction, Its Mechanism, Clinical Manifestations
7. Hypersensitivity Syndromes of Specific Drug
8. Mechanisms
9. Examples of Adverse Effects Associated with Specific Drugs
10. Predisposing Factors
11. ADR Monitoring
12. Spontaneous Reporting
13. Preventing ADRs
14. Communicating
15. Educating
16. Documenting
Objectives and Scope
This monograph aims to provide a comprehensive overview of Adverse Drug Reactions (ADRs), focusing on their classification, mechanisms, and the critical importance of pharmacovigilance in clinical settings to improve patient safety and minimize morbidity.
- Definitions and clinical classifications of various ADR types (Type A to U).
- Mechanisms underlying drug hypersensitivity and immune-mediated reactions.
- Identification of patient-specific predisposing factors for adverse events.
- Evaluation of ADR monitoring, reporting systems, and screening methodologies.
- Strategic recommendations for preventing, documenting, and communicating drug-related problems in hospitals.
Excerpt from the Book
CLASSIFICATION OF ADVERSE DRUG REACTIONS
According to the Wills & Brown classification, these ADRs are classified
Type A: Augmented Reactions
Type A reactions are dose-related actions of a medicine upon the human body, which could have been predicted based upon a knowledge of the mode of action and pharmacology of a drug or excipient. These reactions can only occur while the subject is still receiving the preparation and improve partially or completely when the causative agent is withdrawn or the dose reduced.
Type B: Bugs Reactions
These are adverse reactions that rely upon promoting the growth of certain microorganisms. These type B reactions are pharmacologically predictable events, but they do not type A according to the definition used in the preceding section since the direct and principal pharmacological action is on the bodies of microorganism rather than on the human body. Examples include sugar-containing medicines promoting dental caries, antibiotics causing overgrowth of resistant bacterial species in the intestine, broad-spectrum antibiotics causing oral thrush and over the use of one agent stimulating the development of resistance among a specific species of microorganism rendering further use of the agent ineffective.
Summary of Chapters
Definition: Defines Adverse Drug Reactions (ADRs) as noxious and unintended responses, distinguishing them from broader Adverse Drug Events (ADEs).
Incidence: Reviews meta-analyses regarding the prevalence of serious and fatal ADRs, highlighting their impact on hospitalizations and healthcare costs.
Classification of Adverse Drug Reactions: Details the Wills & Brown system, categorizing ADRs from Type A (augmented) to Type U (unclassified).
Drug Hypersensitivity: Explains immune-mediated drug responses, differentiating between drug allergy and non-immunologic reactions.
Immunologic and Non-Immunologic Drug Reactions: Provides a comparative overview of immune-mediated versus predictable non-immune reactions with clinical examples.
Immune Reaction, Its Mechanism, Clinical Manifestations: Charts the four types of hypersensitivity reactions, their underlying mechanisms, and clinical symptoms.
Hypersensitivity Syndromes of Specific Drug: Lists specific drugs and their associated hypersensitivity syndromes caused by non-IgE mechanisms.
Mechanisms: Discusses the underlying causes of ADRs, including abnormal pharmacokinetics and synergistic effects.
Examples of Adverse Effects Associated with Specific Drugs: Provides a reference table linking common medications to potential adverse health conditions.
Predisposing Factors: Identifies risk factors such as polypharmacy, age, and genetics that increase a patient's vulnerability to ADRs.
ADR Monitoring: Explores methodologies like case registries and cohort studies for the active surveillance of drug safety.
Spontaneous Reporting: Highlights the FDA's reliance on voluntary reporting systems to detect previously unidentified drug reactions.
Preventing ADRs: Outlines institutional recommendations to minimize medication errors and improve clinical safety processes.
Communicating: Emphasizes the role of effective communication between practitioners and patients in managing ADRs.
Educating: Discusses the necessity of patient education and alert systems to avoid future adverse events.
Documenting: Stresses the importance of accurate causality and severity reporting for comprehensive medical record-keeping.
Keywords
Adverse Drug Reactions, Pharmacovigilance, Drug Hypersensitivity, Medication Errors, Patient Safety, Drug Toxicity, Clinical Pharmacy, Type A Reactions, Spontaneous Reporting, Risk Factors, Drug Interaction, Immunologic Reactions, Healthcare Monitoring, Causality Assessment, Medical Documentation.
Frequently Asked Questions
What is the primary focus of this work?
This work focuses on the definition, classification, and management of Adverse Drug Reactions (ADRs) and the vital importance of implementing effective pharmacovigilance programs.
What are the central thematic areas covered?
The core themes include ADR classification systems, immune-mediated versus non-immune drug reactions, monitoring techniques, and strategies for prevention and documentation.
What is the primary objective of the monograph?
The objective is to provide a structured understanding of ADRs to assist healthcare professionals in identifying, reporting, and preventing drug-related harm.
What methodology is used to analyze ADRs?
The monograph utilizes literature reviews, meta-analysis summaries, and standard classification systems like the Wills & Brown model to analyze ADR patterns.
What is addressed in the main body of the text?
The main body examines the physiological mechanisms of reactions, specific risk factors for patients, and the practical application of surveillance methods in hospital environments.
Which keywords best characterize this work?
Key terms include Adverse Drug Reactions, Pharmacovigilance, Hypersensitivity, Clinical Pharmacy, and Drug Safety.
How do Type A and Type B reactions differ according to the text?
Type A reactions are dose-dependent and predictable based on pharmacology, whereas Type B reactions relate to the promotion of microorganisms or other specific adverse influences not strictly tied to the drug's primary pharmacological action on the human body.
What is the role of spontaneous reporting in ADR detection?
Spontaneous reporting acts as the "backbone" for drug safety, allowing for the detection of rare or previously unidentified ADRs during the early market history of new medications.
Why is documenting ADRs considered vital?
Documentation is critical to avoid inaccuracies in causality assignment and to ensure that appropriate therapeutic decisions can be made for the patient's future care.
- Citation du texte
- Dr. Sagar Pamu (Auteur), 2018, Adverse Drug Reactions (ADRs), Munich, GRIN Verlag, https://www.grin.com/document/425372
