Desmopressin – Uses, Mechanism and Dosage
Desmopressin is a synthetic hormone analogue used to treat diabetes insipidus, bedwetting, and certain bleeding disorders.
Things worth knowing about "Desmopressin"
Desmopressin is a synthetic hormone analogue used to treat diabetes insipidus, bedwetting, and certain bleeding disorders.
What is Desmopressin?
Desmopressin is a synthetic analogue of the naturally occurring hormone vasopressin, also known as antidiuretic hormone (ADH). It was developed to mimic and prolong the effects of the natural hormone without its blood pressure-raising properties. Desmopressin is available in several formulations, including tablets, sublingual melting tablets, nasal spray, and injectable solutions.
Indications
Desmopressin is used for a range of medical conditions:
- Central diabetes insipidus: A condition in which the kidneys produce excessive amounts of urine due to insufficient production or action of ADH. Desmopressin replaces the missing hormone.
- Primary nocturnal enuresis (bedwetting): In children and adults who involuntarily urinate during sleep, desmopressin helps reduce nighttime urine production.
- Nocturia: Frequent nighttime urination in adults that disrupts sleep.
- Von Willebrand disease type 1 and mild haemophilia A: Desmopressin stimulates the release of clotting factors and is used for the prevention or treatment of bleeding episodes.
Mechanism of Action
Desmopressin selectively binds to V2 receptors located in the collecting ducts of the kidneys. This binding triggers an intracellular signalling cascade that leads to the insertion of water channel proteins called aquaporin-2 into the membrane of renal tubule cells. As a result, water reabsorption from the primary urine back into the bloodstream is significantly increased, reducing urine volume and producing more concentrated urine. Unlike natural vasopressin, desmopressin has minimal affinity for V1 receptors, meaning it does not substantially raise blood pressure. For bleeding disorders, desmopressin acts via V2 receptors on vascular endothelial cells to stimulate the release of stored von Willebrand factor and factor VIII.
Dosage and Administration
The dosage of desmopressin depends on the indication, the age of the patient, and the formulation used:
- Tablets / sublingual tablets: Commonly used for bedwetting and nocturia. They are typically taken shortly before bedtime.
- Nasal spray: Used in central diabetes insipidus. The dose is individually determined by the treating physician.
- Injection / infusion: Used primarily in bleeding disorders or in perioperative settings.
Important: Fluid intake should be restricted during treatment to minimise the risk of hyponatraemia (low blood sodium levels), which is a potentially serious complication.
Side Effects
Desmopressin is generally well tolerated. Possible side effects include:
- Headache
- Nausea and abdominal pain
- Fluid retention (oedema)
- Hyponatraemia (low sodium levels): especially with excessive fluid intake; can cause confusion, seizures, and in severe cases, coma
- Nasal mucosa irritation when using the nasal spray
- Rarely: allergic reactions
Contraindications and Precautions
Desmopressin should not be used in:
- Habitual or psychogenic polydipsia (compulsive excessive drinking)
- Known heart failure or conditions requiring diuretic therapy
- Severe renal insufficiency
- Hyponatraemia
Extra caution is required in elderly patients and in children under 5 years of age, as these groups are at higher risk of developing hyponatraemia.
References
- European Medicines Agency (EMA): Assessment report on desmopressin-containing medicinal products, 2017. Available at: www.ema.europa.eu
- Fjellestad-Paulsen A. et al. - Pharmacokinetics of 1-deamino-8-D-arginine vasopressin after various routes of administration in healthy volunteers. Clinical Endocrinology, 1993.
- Neveus T. et al. - Evaluation of and treatment for monosymptomatic enuresis: a standardization document from the International Children's Continence Society. Journal of Urology, 2010.
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