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Background: Multiple drug allergy and multiple drug intolerance syndrome (MDAS/MDIS) labels are an impediment to clinical care and knowledge regarding these conditions is limited. This systematic review investigated the characterization, epidemiology, risk factors, clinical impact and pharmaco‐economics of MDAS and MDIS. Methods: Systematic literature search across 11 databases (01 January 2000–06 November 2020) for MDIS, MDAS and related terminology. Studies were reviewed for quality of evidence and risk of bias by employing Critical Appraisal Skills Programme cohort study checklist. A narrative synthesis approach facilitated by systematic textual descriptions, tabulation and thematic analysis was adopted. Results: There was heterogeneity in terminology and methodology. Few studies applied standard drug allergy diagnostic methods. There is some evidence to suggest that multiple drug hypersensitivity syndrome (MDHS; i.e., confirmed allergies in MDAS) is a distinct clinical entity. Prevalence of MDIS and MDAS labels in unselected & selected populations varied between 2.1%–6.4% & 4.9%–90% and 1.2% & 0%–36% respectively. Reported risk factors included female gender, increasing age, body mass index, anxiety, depression, co‐morbidities, concurrent allergies and increased healthcare utilization. Drugs commonly implicated were antibiotics and non‐steroidal anti‐inflammatory drugs. No studies relating to clinical impact and pharmaco‐economics were found. Conclusion: There is considerable burden of MDAS and MDIS labels. Data needs cautious interpretation as majority of studies described involved unverified labels. Despite this limitation and heterogeneity of studies, there is some evidence to suggest that MDHS is a distinct clinical entity. Well‐designed multi‐centre studies applying standardized terminology and diagnostic methodology are needed to gain further insight into these conditions. [ABSTRACT FROM AUTHOR]

Abstract Background Multiple drug allergy and multiple drug intolerance syndrome (MDAS/MDIS) labels are an impediment to clinical care and knowledge regarding these conditions is limited. This systematic review investigated the characterization, epidemiology, risk factors, clinical impact and pharmaco‐economics of MDAS and MDIS. Methods Systematic literature search across 11 databases (01 January 2000–06 November 2020) for MDIS, MDAS and related terminology. Studies were reviewed for quality of evidence and risk of bias by employing Critical Appraisal Skills Programme cohort study checklist. A narrative synthesis approach facilitated by systematic textual descriptions, tabulation and thematic analysis was adopted. Results There was heterogeneity in terminology and methodology. Few studies applied standard drug allergy diagnostic methods. There is some evidence to suggest that multiple drug hypersensitivity syndrome (MDHS; i.e., confirmed allergies in MDAS) is a distinct clinical entity. Prevalence of MDIS and MDAS labels in unselected & selected populations varied between 2.1%–6.4% & 4.9%–90% and 1.2% & 0%–36% respectively. Reported risk factors included female gender, increasing age, body mass index, anxiety, depression, co‐morbidities, concurrent allergies and increased healthcare utilization. Drugs commonly implicated were antibiotics and non‐steroidal anti‐inflammatory drugs. No studies relating to clinical impact and pharmaco‐economics were found. Conclusion There is considerable burden of MDAS and MDIS labels. Data needs cautious interpretation as majority of studies described involved unverified labels. Despite this limitation and heterogeneity of studies, there is some evidence to suggest that MDHS is a distinct clinical entity. Well‐designed multi‐centre studies applying standardized terminology and diagnostic methodology are needed to gain further insight into these conditions.

Background: Multiple drug intolerance syndrome (MDIS) describes patients with multiple nonimmunologically mediated adverse reactions to medications. Patients with more than 10 medication intolerance labels are considered to have severe MDIS. There is overlap in the characteristics of patients with MDIS and fibromyalgia and irritable bowel syndrome (IBS). Severe MDIS can limit treatment options in this already complex patient group., Objective: This study assessed the prevalence of severe MDIS in patients with fibromyalgia and IBS and its associated risk factors., Methods: A retrospective chart review identified patients diagnosed with fibromyalgia or IBS who had been seen at a large academic center from August 2019 to July 2020. Exact birthdate- and sex-matched controls who had been seen within the same time frame were selected at random. Listed drug intolerance data and patient characteristics were then analyzed with logistic regression and χ 2 testing., Results: Patients with fibromyalgia and IBS were 12 and 3 times more likely to have severe MDIS compared with controls, respectively. Severe MDIS was associated with polypharmacy in both groups. Opiates were the most frequently reported drug intolerance across all participants. Although patients with IBS more often reported gastrointestinal symptoms as adverse reactions, individuals with fibromyalgia did not more frequently report pain or behavioral changes as adverse reactions., Conclusions: There was an increased rate of severe MDIS in patients diagnosed with fibromyalgia and IBS. Additional studies are needed to better understand the morbidity of MDIS and how it can best be managed in patients with fibromyalgia and IBS., (Copyright © 2024 American Academy of Allergy, Asthma & Immunology. Published by Elsevier Inc. All rights reserved.)

Background: Drug allergy is frequently reported, but uncommonly confirmed with diagnostic testing. Although drug allergy assessments can improve clinical care, patient concerns may impact the optimal diagnostic approach and/or the clinical effectiveness of diagnostic testing., Objective: To assess drug allergy patient concerns., Methods: Using data from a multisite, prospective longitudinal cohort study, the United States Drug Allergy Registry (January 16, 2019, to January 24, 2020), we determined patient self-reported characteristics and qualitatively coded free-text patient concerns about their drug allergy/allergies. We assessed associations between patient characteristics and drug allergy concerns using multinomial logistic regression models., Results: Of 592 patients (mean age, 49 [standard deviation, 17] years, 74% female, 88% white), the most commonly reported drug allergies were penicillins (78%), cephalosporins (12%), and sulfonamides (12%) with common reactions of rash (62%), hives (54%), itching (48%), flushing or facial redness (28%), and swelling or angioedema (24%). Patient concerns, coded from free text, were optimal medication use (41%), no concern (17%), allergic reaction (14%), diagnosis (12%), and severe allergic reaction (12%). Using multinomial regression, the presence of drug allergy concerns increased with greater age, higher number of reported drug reactions, more antibiotic use, and certain reaction symptoms, most notably mouth or palate itching. Female sex was associated with increased severe allergic reaction concern. Poorer general and mental health was associated with increased allergic reaction concern., Conclusion: Patients with drug allergy were concerned about their options for medical treatment, having an allergic reaction, and receiving clarity about their diagnosis. Capturing and addressing patient concerns may improve the approach to patients with drug allergy and/or the effectiveness of drug allergy testing., (Copyright © 2020 American Academy of Allergy, Asthma & Immunology. Published by Elsevier Inc. All rights reserved.)