desmopressin
DDAVP (desmopressin) is a synthetic version of the body's water-retaining hormone vasopressin. It concentrates urine in diabetes insipidus, curbs excess urination after pituitary injury, and can temporarily raise clotting factor levels in mild haemophilia A.
This page is based on FDA prescribing information and Health Canada product information for desmopressin, cross-checked with MedlinePlus and the National Cancer Institute dictionary; the mechanism is explained in plain language, and analogies are used only where they stay accurate.
How it works
Explains what the medicine does in the body, not dosing, side effects, or safety.
An analogy
The body's water balance is run by a thermostat hormone, vasopressin, that tells the kidneys how much water to keep. In diabetes insipidus the thermostat signal is missing, so the kidneys dump water non-stop. Desmopressin is a spare key that fits the same lock and turns the water-saving program back on.
In simple terms
Desmopressin copies the action of vasopressin, the hormone that tells the kidneys to hold on to water. In diabetes insipidus the body lacks this signal and produces large volumes of dilute urine; desmopressin restores water reabsorption so output falls. It also prompts blood vessel walls to release factor VIII and von Willebrand factor, which is why it helps control bleeding in mild haemophilia A.
In depth
Desmopressin acetate is a synthetic analogue of arginine vasopressin with deamination at position 1 and D-arginine at position 8, conferring selective V2 receptor agonism with minimal V1-mediated vasoconstriction. Renal V2 stimulation increases aquaporin-2 insertion in collecting duct cells, raising water permeability and concentrating urine. V2 stimulation on endothelial cells also releases von Willebrand factor and factor VIII, producing a transient haemostatic effect useful in mild haemophilia A and selected platelet disorders.
See it in motion
A schematic animation of the mechanism — simplified for clarity, not drawn to scale.
Desmopressin is a spare key that fits the same lock
- The body's water balance is run by a thermostat hormone, vasopressin, that tells the kidneys how much water to keep.
- In diabetes insipidus the body lacks this signal and produces large volumes of dilute urine; desmopressin restores water reabsorption so output falls.
- Renal V2 stimulation increases aquaporin-2 insertion in collecting duct cells, raising water permeability and concentrating urine.
- V2 stimulation on endothelial cells also releases von Willebrand factor and factor VIII, producing a transient haemostatic effect useful in mild haemophilia A and selected platelet disorders.
Target: Vasopressin V2 receptor
A receptor in the kidney's collecting ducts that, when stimulated by vasopressin, makes the ducts reclaim water; it also triggers release of clotting factors from blood vessel linings.
Approved uses
Approved uses differ by country and change over time. Always follow your local prescribing information.
Approved uses in United States
FDA- Antidiuretic replacement therapy in central (cranial) diabetes insipidus
- Management of temporary polyuria and polydipsia following head trauma or surgery in the pituitary region
- In haemophilia A, to raise factor VIII coagulant activity around bleeding episodes or minor procedures
Official sources
The statements on this page trace back to these records.
- U.S. Food and Drug Administration: desmopressin prescribing information
U.S. Food and Drug Administration
- MedlinePlus: desmopressin
MedlinePlus, U.S. National Library of Medicine
- National Cancer Institute: desmopressin acetate
National Cancer Institute
This page explains how the medicine works — it isn’t the patient leaflet. For anything that applies to you, read the leaflet that came with your medicine or ask your pharmacist.
MedUnfold provides educational content and is not medical advice. Always follow your local prescribing information and healthcare professional.