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Adverse drug reactions (ADRs) are unwarranted and unintended responses to medications that can range from mild to severe and occasionally pose life-threatening risks. Designed for healthcare professionals actively engaged in patient care, this activity focuses on equipping participants with the skills to identify, diagnose, and treat ADRs promptly. Through a comprehensive review, participants will gain insights into the diverse manifestations of ADRs and their etiopathogenesis. Additionally, participants will hone their ability to navigate the complexities of ADR diagnosis, treatment, and prevention. This activity underscores the collaborative nature of addressing ADRs by emphasizing the pivotal role of the interprofessional team. Participants gain a nuanced understanding of how healthcare professionals from various disciplines can synergize their efforts to prevent, diagnose, and manage ADRs effectively. By the conclusion of this activity, attendees will be well-versed in fostering a collaborative and patient-centric approach to optimize outcomes in healthcare settings. Objectives: Differentiate between various types of ADRs based on their clinical presentations and underlying mechanisms. Assess and monitor patients for ADRs by employing validated evaluation tools and strategies. Improve medication histories, allergy documentation, and the clinical accuracy of medication regimens to prevent ADRs. Collaborate with experts in medicine, pharmacy, and nursing to ensure that ADRs are diagnosed, managed, and mitigated effectively. Access free multiple choice questions on this topic.

An adverse drug reaction (ADR) refers to an untoward reaction to a medication. ADRs are common and constitute a significant healthcare burden. The most robust database of ADRs available is the U.S. Food and Drug Administration's Adverse Event Reporting System (FAERS). In 2022, there were over 1.25 million serious adverse events reported and nearly 175,000 deaths. [FDA. FDA Adverse Event Reporting System. Accessed January 1st, 2024]. There are 6 emergency department (ED) visits for therapeutic and nontherapeutic medication harms per 1,000 patients, and about 38% of such visits subsequently require hospitalization.[1] Additionally, in 3 out of every 1000 hospital admissions, a patient dies due to an ADR.[2]  Thus, ADRs increase morbidity, mortality, hospitalizations, and healthcare costs. Therefore, healthcare professionals must be ready to identify and treat ADRs and prioritize efforts to prevent their occurrence. ADR Definitions The International Conference on Harmonization of Technical Requirements for Registration of Pharmaceuticals for Human Use, of which the World Health Organization (WHO) and the United States Food and Drug Administration (FDA) are members, defines an ADR as "A response to a drug which is noxious and unintended, and which occurs at doses normally used for prophylaxis, diagnosis, or therapy of disease or the modification of physiologic function." [3][4] An adverse drug event, on the other hand, is defined as: "Any untoward medical occurrence that may present during treatment with a pharmaceutical product, but which does not necessarily have a causal relationship with this treatment." [4] Therefore, an ADR is an adverse event with a causal connection to a drug.[4] Edwards et al suggested that the above definition is not all-inclusive and defines an ADR as "an appreciably harmful or unpleasant reaction, resulting from an intervention related to the use of a medicinal product, which predicts hazard from future administration and warrants prevention or specific treatment, or alteration of the dosage regimen, or withdrawal of the product."[5] Multiple organizations have offered other definitions for ADRs, though the above will be used for the purposes of this evidence-based resource.[6][5][7]

A study assessing ADRs in hospitalized patients revealed that physicians often overlook a significant portion of these reactions.[73] The data recorded by nursing staff may help identify up to 40% of all ADRs that physicians could miss.[74] Overlooking an ADR could result in the provision of inappropriate treatment for such reactions.[75] Thus, maintaining vigilance in identifying and diagnosing ADRs is critical.  Such vigilance is achieved through the collaborative efforts of a multidisciplinary healthcare team. Continuous education and training for healthcare professionals are essential to identifying and diagnosing ADRs. Staying up-to-date on the latest drug information, potential interactions, and ADR profiles can aid in the early recognition of ADRs. Additional benefits may come from regular ADR case reviews. Effective communication within the multidisciplinary healthcare team is also essential to ADR identification and diagnosis. Sharing patient information, including medication history, comorbidities, and previous ADRs, helps in accurate diagnosis and decision-making. Finally, team members should encourage patients to report any unusual symptoms or adverse effects they experience during medication therapy to ensure early recognition.