Melt (Desmopressin)

Desmopressin acts on the antidiuretic hormone pathway to manage water balance and coagulation disorders.

• Central diabetes insipidus: reduces excessive urine output by increasing renal water reabsorption.
• Nocturnal enuresis: decreases nighttime bedwetting episodes through improved water retention.
• Hemophilia A: raises plasma factor VIII levels to aid clot formation.
• von Willebrand disease: enhances release of von Willebrand factor, improving platelet adhesion.

• Desmopressin is a synthetic analogue of vasopressin that selectively binds to V2 receptors on renal collecting‑duct cells. Activation of V2 receptors triggers cyclic AMP formation, promoting insertion of aquaporin‑2 water channels into the apical membrane, which increases water reabsorption. The same V2 stimulation in endothelial cells induces release of von Willebrand factor and factor VIII, supporting hemostasis and contributes to plasma concentration elevation.

Desmopressin may cause a range of adverse reactions, varying from mild to serious.

Common Side Effects

• Headache: mild to moderate pain in the head, often transient.
• Nausea: upset stomach with urge to vomit, may be accompanied by loss of appetite.
• Hyponatremia: low blood sodium levels, usually mild but may cause fatigue.

Serious or Rare Side Effects

• Severe hyponatremia: can lead to seizures, confusion, or coma and requires immediate medical attention.
• Water intoxication: excessive fluid retention causing edema, weight gain, and potentially dangerous electrolyte imbalance.
• Allergic reaction: rash, itching, swelling of face or throat, which may indicate hypersensitivity.

When prescribing Desmopressin, several precautions should be observed to minimize risk.

• Assess fluid balance: evaluate patient hydration status before initiating therapy.
• Monitor electrolytes: regularly check serum sodium levels during treatment.
• Limit fluid intake: advise patients to restrict excessive water consumption while on medication.
• Use caution in renal impairment: adjust therapy and monitor closely in patients with reduced kidney function.
• Avoid in uncontrolled hypertension: consider cardiovascular status before prescribing.
• Store at ambient temperature: keep tablets below 25 °C in the original container, protected from moisture.

Desmopressin may interact with other medicines, requiring attention to avoid adverse effects.

Major Interactions (Avoid)

• Concomitant use with carbamazepine: may reduce Desmopressin effectiveness.
• Co‑administration with thiazide diuretics: increases risk of hyponatremia.

Moderate Interactions (Monitor Closely)

• NSAIDs (e.g., ibuprofen): can potentiate water retention and hyponatremia.
• Antidepressants (SSRIs): may enhance antidiuretic effect, requiring sodium monitoring.
• Alcohol: can exacerbate fluid balance disturbances.