{"id":"aspirin-asa","safety":{"commonSideEffects":[{"rate":"1-3","effect":"Gastrointestinal bleeding or ulceration"},{"rate":"5-10","effect":"Dyspepsia"},{"rate":"2-5","effect":"Nausea"},{"rate":"1-2","effect":"Hemorrhage (minor)"},{"rate":"0.5-1","effect":"Allergic reactions (including bronchospasm in aspirin-sensitive patients)"},{"rate":null,"effect":"Renal impairment (with chronic use)"}]},"_chembl":null,"_dailymed":null,"mechanism":{"_ai_source":"claude-haiku-4.5","explanation":"Aspirin acetylates serine residues on COX-1 and COX-2 enzymes, permanently blocking their catalytic activity. This prevents the synthesis of prostaglandins (which mediate inflammation and pain) and thromboxane A2 (which promotes platelet clumping). The antiplatelet effect is particularly durable because aspirin irreversibly modifies platelet COX-1, and platelets cannot synthesize new enzyme.","oneSentence":"Aspirin irreversibly inhibits cyclooxygenase (COX) enzymes, reducing the production of prostaglandins and thromboxane to decrease inflammation, pain, and platelet aggregation.","_ai_confidence":"high"},"_scrapedAt":"2026-03-27T23:42:43.707Z","_scrapedBy":"cloudflare-swarm","_wikipedia":null,"indications":{"approved":[{"name":"Acute myocardial infarction"},{"name":"Secondary prevention of myocardial infarction and stroke"},{"name":"Unstable angina"},{"name":"Transient ischemic attack (TIA) prevention"},{"name":"Mild to moderate pain and fever"},{"name":"Rheumatoid arthritis and other inflammatory conditions"}]},"trialDetails":[{"nctId":"NCT03654105","phase":"PHASE2","title":"Screening and Multiple Intervention on Lung Epidemics","status":"ACTIVE_NOT_RECRUITING","sponsor":"Fondazione IRCCS Istituto Nazionale dei Tumori, Milano","startDate":"2019-07-23","conditions":"Inflammation, Smoking Cessation, Diet Modification","enrollment":2000},{"nctId":"NCT07494877","phase":"","title":"Effect of Anticoagulant Therapy on Endometrial Receptivity and Pregnancy Outcomes in Infertility","status":"RECRUITING","sponsor":"Tang-Du Hospital","startDate":"2025-09-01","conditions":"Infertility","enrollment":300},{"nctId":"NCT03574909","phase":"PHASE3","title":"IRELAnD: Investigating the Role of Early Low-dose Aspirin in Diabetes","status":"COMPLETED","sponsor":"Royal College of Surgeons, Ireland","startDate":"2018-09-01","conditions":"Pre-Gestational Diabetes","enrollment":137},{"nctId":"NCT02965703","phase":"PHASE2","title":"Aspirin in Preventing Colorectal Cancer in Patients With Colorectal Adenoma","status":"ACTIVE_NOT_RECRUITING","sponsor":"National Cancer Institute (NCI)","startDate":"2018-01-16","conditions":"Colorectal Adenoma, Colorectal Carcinoma","enrollment":81},{"nctId":"NCT05009862","phase":"PHASE4","title":"The Impact of Factor Xa Inhibition on Thrombosis, Platelet Activation, and Endothelial Function in Peripheral Artery Disease","status":"COMPLETED","sponsor":"Vanderbilt University Medical Center","startDate":"2022-04-19","conditions":"Peripheral Arterial Disease","enrollment":60},{"nctId":"NCT06757764","phase":"PHASE4","title":"The Effect and Safety of Combined Anti-platelet Treatment in Acute Ischemic Stroke Due to Large Artery Atherosclerosis","status":"RECRUITING","sponsor":"Asan Medical Center","startDate":"2025-07-10","conditions":"Cerebral Infarction, Stenosis Artery","enrollment":2340},{"nctId":"NCT05521776","phase":"NA","title":"Impact of First-trimester Preeclampsia Screening on Perinatal and Maternal Morbidity (RANSPRE)","status":"RECRUITING","sponsor":"Assistance Publique - 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