{"schemaVersion":"wpf-profile-export-v1","exportedAt":"2026-09-18T15:18:27.514Z","profile":{"slug":"vasopressin","name":"Vasopressin","aliases":[],"category":"Endogenous neurohypophyseal nonapeptide / vasopressor medicine"},"synthesis":{"mechanism":"Arginine vasopressin, also called argipressin or antidiuretic hormone, is an endogenous cyclic nonapeptide synthesized in hypothalamic neurons and released from the posterior pituitary. V1a-receptor activation constricts vascular smooth muscle, V2-receptor activation promotes renal water reabsorption through aquaporin-2 trafficking, and additional receptor signaling contributes to pituitary, hemostatic, and central effects. Pharmaceutical vasopressin is used in tightly defined clinical contexts, notably as an intravenous vasopressor for vasodilatory shock in the United States; endogenous physiology, diagnostic biomarkers, receptor antagonists, analogs, and investigational intranasal research must remain distinct.","evidence":"The governed 25-source corpus emphasizes randomized trials and systematic reviews of vasopressin in septic and vasoplegic shock, including renal, mortality, hemodynamic, dose, pediatric, cancer, and cardiac-surgery contexts. Separate evidence lanes cover cardiac arrest, portal-variceal bleeding, gynecologic local injection, human vascular pharmacology, and safety. PubMed identities, titles, authorship, publication metadata, DOI/PMID, direct vasopressin relevance, source status, and duplication were verified. Studies of desmopressin, terlipressin, receptor antagonists, or copeptin were excluded from the core therapeutic corpus unless directly necessary for clearly labeled context.","safety":"Vasopressin can cause excessive vasoconstriction and ischemia involving cardiac, mesenteric, digital, or cutaneous circulations; reduced cardiac output, arrhythmias, hyponatremia or water-balance disturbances, and extravasation-related injury are additional concerns depending on route and context. Risk varies with shock phenotype, dose, duration, concomitant catecholamines, vascular disease, and monitoring. Local intramyometrial injection and historical gastrointestinal-bleeding or cardiac-arrest protocols are not interchangeable with labeled intravenous vasodilatory-shock use. Canadian and U.S. products cited here differ in routes, indications, formulation, and safety instructions.","observationalBoundary":"The strongest therapeutic evidence concerns adjunctive or comparative vasopressin in vasodilatory shock, but trials and meta-analyses do not support treating all shock populations as equivalent. Timing, dose, catecholamine exposure, septic phenotype, cardiac function, pediatric status, and outcome definition materially affect interpretation. Historical and procedural uses are retained to document the breadth and evolution of clinical investigation, not to imply current authorization or preferred practice. Behavioral intranasal research and physiological biomarker studies remain separate from the clinical vasopressor evidence lane.","openQuestions":"Which shock phenotypes, timing strategies, and dose ranges provide the best net clinical benefit? Can biomarkers or hemodynamic features identify responders while minimizing ischemic injury? What are the comparative effects on kidney-replacement therapy, arrhythmia, digital or mesenteric ischemia, and long-term patient-centered outcomes? How should evidence differ in septic, post-cardiotomy, pediatric, cancer-associated, and other vasoplegic states? Which historical or local procedural uses remain supported under contemporary safety standards? 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