{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,26]],"date-time":"2026-09-26T21:04:53Z","timestamp":1790456693089,"version":"4.1.0"},"reference-count":66,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T00:00:00Z","timestamp":1776816000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Cross-reactivity among nonsteroidal anti-inflammatory drugs (NSAIDs) creates a significant clinical difficulty, especially in patients with NSAID hypersensitivity. These reactions are based on cyclooxygenase-1 (COX-1) inhibition and non-immunoglobulin E (IgE)-mediated reactions. COX-1 inhibition leads to dysregulation of arachidonic acid metabolism, with decreased prostaglandin synthesis and increased leukotriene production. Clinically, cross-intolerant reactions manifest in different phenotypes, including NSAID-exacerbated respiratory disease (NERD), NSAID-induced urticaria\/angioedema (NIUA), and NSAID-exacerbated cutaneous disease (NECD). In contrast, true allergic reactions\u2014such as single-NSAID-induced urticaria\/angioedema and anaphylaxis (SNIUAA) and single-NSAID-induced delayed hypersensitivity reactions (SNIDHR)\u2014are immunologically mediated and drug-specific. These phenotypes differ in underlying conditions, clinical manifestations, and patterns of NSAID tolerance. Paracetamol is generally considered a safer alternative due to its weak COX-1 inhibition; however, reactions may still occur, particularly at higher doses. Selective COX-2 inhibitors are usually better tolerated, however their safety should be confirmed, preferably through controlled drug provocation testing due to sporadic reactions in cross-intolerant patients. Understanding the distinction between pharmacologically mediated cross-intolerance and true allergic reactions is essential for accurate diagnosis, risk stratification, and therapeutic decision-making. This review summarizes current evidence on the mechanisms underlying NSAID hypersensitivity, analyzes the tolerability of paracetamol and alternative analgesics, and discusses practical management strategies to reduce the risk of adverse reactions.<\/jats:p>","DOI":"10.3390\/ijms27093727","type":"journal-article","created":{"date-parts":[[2026,4,22]],"date-time":"2026-04-22T12:54:08Z","timestamp":1776862448000},"page":"3727","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Cross-Reactivity and Cross-Intolerance Among Nonsteroidal Anti-Inflammatory Drugs (NSAIDs): Clinical Patterns, COX-1-Mediated Mechanisms, and Implications for COX-2 Inhibitors and Paracetamol"],"prefix":"10.3390","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-1827-6387","authenticated-orcid":false,"given":"Wiktoria","family":"Andryszkiewicz","sequence":"first","affiliation":[{"name":"Research Group of Allergology and Internal Medicine, Wroclaw Medical University, 50-556 Wroclaw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Martyna","family":"Lippik","sequence":"additional","affiliation":[{"name":"Research Group of Allergology and Internal Medicine, Wroclaw Medical University, 50-556 Wroclaw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0005-4023-9694","authenticated-orcid":false,"given":"Ma\u0142gorzata","family":"Makie\u0142a","sequence":"additional","affiliation":[{"name":"Research Group of Allergology and Internal Medicine, Wroclaw Medical University, 50-556 Wroclaw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bartosz","family":"Modrzyk","sequence":"additional","affiliation":[{"name":"Research Group of Allergology and Internal Medicine, Wroclaw Medical University, 50-556 Wroclaw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7218-2961","authenticated-orcid":false,"given":"Krzysztof","family":"Gomu\u0142ka","sequence":"additional","affiliation":[{"name":"Clinical Department of Allergology and Internal Medicine, Wroclaw Medical University, 50-556 Wroclaw, Poland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,4,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"19","DOI":"10.3121\/cmr.2007.698","article-title":"An Evidence-Based Update on Nonsteroidal Anti-Inflammatory Drugs","volume":"5","author":"Ong","year":"2007","journal-title":"Clin. 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