Minrin Melt (Desmopressin)

• Desmopressin acts on the antidiuretic hormone pathway to control water balance and haemostatic function.
• Central diabetes insipidus: reduces excessive urine output by enhancing renal water reabsorption.
• Nocturnal enuresis: decreases nighttime bedwetting episodes in children by concentrating urine.
• Mild hemophilia A and von Willebrand disease: raises plasma levels of factor VIII and von Willebrand factor to improve clotting.
• Bleeding due to mild coagulation disorders: provides a temporary increase in clotting factors to support haemostasis.

• Desmopressin is a synthetic analogue of vasopressin that selectively binds to V2 receptors on the basolateral membrane of renal collecting‑duct cells. Activation of these receptors stimulates adenylate cyclase, increasing cyclic AMP, which promotes insertion of aquaporin‑2 water channels into the apical membrane, thereby enhancing water reabsorption. In the vascular endothelium, it stimulates release of stored factor VIII and von Willebrand factor, improving haemostatic function.

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

Common Side Effects

• Hyponatremia: low blood sodium levels, often mild.
• Headache: transient and usually mild.
• Nausea: occasional gastrointestinal upset.
• Abdominal cramps: mild discomfort.
• Flushing: brief redness of the skin.

Serious or Rare Side Effects

• Water intoxication: severe hyponatremia leading to cerebral edema.
• Seizures: secondary to profound electrolyte disturbance.
• Severe hyponatremia: may require urgent medical intervention.
• Allergic reactions: rash, itching, or anaphylaxis.
• Thromboembolic events: rare clot formation in susceptible patients.

• Before initiating therapy, clinicians should consider several safety measures.
• Renal function: assess baseline kidney status and monitor periodically.
• Electrolytes: check serum sodium before and during treatment.
• Fluid intake: limit excessive water consumption to reduce hyponatremia risk.
• Concomitant drugs: avoid simultaneous use with other antidiuretics.
• Pregnancy and lactation: use only if potential benefits outweigh risks.
• Store at ambient temperature: keep in the original container, protect from moisture and heat.

Desmopressin can interact with other medicines, requiring attention to avoid adverse outcomes.

Major Interactions (Avoid)

• MAO inhibitors: increased risk of severe hyponatremia.
• NSAIDs: may potentiate antidiuretic effect and fluid retention.
• CYP2C9 substrates: potential alteration of drug clearance.

Moderate Interactions (Monitor Closely)

• Antihypertensives: possible additive hypotensive effect.
• Diuretics: may counteract desmopressin's antidiuretic action.
• Anticoagulants: monitor clotting parameters when used together.