Desmopressin

Desmopressin is described as a V2-selective vasopressin receptor agonist. In renal collecting ducts, V2 activation raises intracellular signaling that moves aquaporin water channels into place, allowing more water to be reabsorbed and producing smaller volumes of more concentrated urine. The source also notes that desmopressin has much less V1-mediated blood-vessel constriction than vasopressin. In endothelial tissue, V2 activity can increase release of stored von Willebrand factor and factor VIII, linking the same receptor system to hemostatic effects in selected bleeding disorders.

The source characterizes desmopressin as a long-used approved medicine rather than an experimental peptide. It reports clinical relevance in central diabetes insipidus, nocturnal enuresis, and nocturia through reduced urine production. It also describes hemostatic use because desmopressin can raise von Willebrand factor and factor VIII, with relevance to von Willebrand disease, mild hemophilia A, and some procedure-related contexts. The main safety issue emphasized is dilutional hyponatremia from retained water, with higher concern in young children and older adults according to the supplied source.