Desmopressin
A synthetic analog of arginine vasopressin (DDAVP) with potent antidiuretic activity and minimal vasopressor effect, used for enuresis, diabetes insipidus, and bleeding disorders.
Overview
Native arginine vasopressin has both antidiuretic (V2) and vasoconstrictive (V1) actions and a very short half-life. Desmopressin removes the amino terminus and substitutes D-arginine, which selectively enhances V2 antidiuretic activity, prolongs the half-life, and minimizes V1-mediated blood-pressure and smooth-muscle effects.
By acting on renal V2 receptors, desmopressin concentrates the urine, making it the mainstay treatment for central diabetes insipidus and a widely used therapy for primary nocturnal enuresis and nocturnal polyuria. Reviews of randomized trials show it reliably reduces the frequency of wet nights and is well tolerated with an exceptional safety margin, though many children relapse when it is stopped. Through V2 receptors on vascular endothelium it also releases von Willebrand factor and factor VIII, giving it a distinct role in managing certain bleeding disorders and pre-procedure hemostasis.
The principal safety concern is dilutional hyponatremia from water retention, so fluid intake is restricted around dosing and sodium is monitored, especially in young children and older adults.
Mechanism of Action
The structural modifications (deamination at position 1 and D-arginine at position 8) confer V2 selectivity and metabolic stability. V2 receptor activation raises intracellular cAMP in collecting-duct principal cells, driving aquaporin-2 trafficking to the apical membrane and enhancing free-water reabsorption—reducing urine volume in diabetes insipidus and overnight urine production in enuresis/nocturia. The same receptor on vascular endothelial cells mobilizes stored von Willebrand factor and factor VIII, transiently improving primary and secondary hemostasis.
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References (2)
- [1]Fjellestad-Paulsen A, et al. Efficacy, safety, and dosing of desmopressin for nocturnal enuresis in Europe Clinical Pediatrics (1993)
→ Desmopressin is a potent antidiuretic for nocturnal enuresis with few clinically significant adverse effects and an exceptional safety margin relative to native vasopressin.
- [2]Moffatt ME, Harlos S, Kirshen AJ, Burd L Desmopressin acetate and nocturnal enuresis: how much do we know? Pediatrics (1993)
→ Across randomized controlled trials, desmopressin reduces the frequency of wet nights, though a minority achieve full dryness and relapse after discontinuation is common.
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