Minurin (Desmopressin Acetate)

• Desmopressin acetate is used to manage conditions related to antidiuretic hormone deficiency or bleeding disorders.
• Central diabetes insipidus: reduces excessive urine output by increasing renal water reabsorption.
• Nocturnal enuresis: decreases nighttime bedwetting by concentrating urine.
• Hemophilia A (adjunct therapy): raises plasma factor VIII and von Willebrand factor levels to aid haemostatic control.

• Desmopressin acetate is a synthetic analogue of vasopressin that selectively activates V2 receptors on renal collecting‑duct cells. V2 stimulation promotes insertion of aquaporin‑2 water channels, enhancing water reabsorption, and also increases hepatic release of factor VIII and von Willebrand factor, improving haemostatic capacity.

Desmopressin nasal spray may cause a range of adverse reactions.

Common Side Effects

• Nasal irritation or congestion.
• Headache.
• Mild hyponatraemia.
• Thirst or dry mouth.
• Nausea.
• Transient facial flushing.

Serious or Rare Side Effects

• Severe hyponatraemia leading to seizures or coma.
• Water intoxication with cerebral oedema.
• Allergic reactions such as rash, angioedema, or anaphylaxis.
• Hypertensive crisis (rare).
• Cardiac arrhythmias in susceptible patients.
• Persistent nasal bleeding.

Before prescribing Minurin, clinicians should consider several safety measures.

• Renal function: assess and monitor in patients with impaired renal clearance.
• Fluid intake: advise restriction of excessive fluids to minimise hyponatraemia risk.
• Electrolytes: check serum sodium before initiation and periodically during therapy.
• Pregnancy: use only when the potential benefit justifies the potential risk to the fetus.
• Concomitant antidiuretic agents: avoid combined use to prevent severe water retention.
• Store below 25°C: keep in the original container, protect from moisture and light.

Desmopressin may interact with other medicines, altering its efficacy or safety.

Major Interactions (Avoid)

• Other vasopressin analogues (e.g., vasopressin): additive antidiuretic effect can cause profound hyponatraemia.
• Strong CYP2C9 inhibitors (e.g., fluconazole): may increase desmopressin plasma levels.

Moderate Interactions (Monitor Closely)

• NSAIDs: can potentiate renal water reabsorption and raise hyponatraemia risk.
• Diuretics (especially thiazides): may exacerbate electrolyte disturbances.
• Anticoagulants (e.g., warfarin): desmopressin can enhance haemostatic activity, requiring clotting monitoring.
• Antihistamines: may increase nasal mucosal dryness, affecting spray tolerance.