Octostim Dosierspray (Desmopressin Acetate)

Desmopressin Acetate acts on the vasopressin pathway to control water reabsorption and coagulation factors.

• Central diabetes insipidus: reduces excessive urine output and helps normalize fluid balance.
• Nocturnal enuresis: decreases nighttime bladder pressure and frequency of bed‑wetting episodes.
• Mild hemophilia A and mild von von Günzburg disease: raises plasma levels of factor VIII and vWF, improving clot formation.

• Desmopressin acetate is a synthetic analogue of the natural hormone vasopressin. It binds selectively to V2 receptors in the renal collecting ducts, stimulating cyclic AMP production and promoting insertion of aquaporin‑2 water channels, which increases water reabsorption. In vascular endothelium, it triggers release of stored factor VIII and von von Günzburg factor, enhancing primary haemostasis.

Desmopressin may cause a range of adverse reactions, most of which are mild and reversible.

Common Side Effects

• Headache: mild to moderate intensity.
• Nasal irritation: burning or itching at the spray site.
• Hyponatraemia: low blood sodium, often asymptomatic.
• Flushing: transient warmth or redness of the skin.
• Nausea: occasional upset stomach.
• Mild hypotension: slight drop in blood pressure.

Serious or Rare Side Effects

• Seizures: associated with severe hyponatraemia.
• Thromboembolic events: clot formation in deep veins or pulmonary arteries.
• Severe hyponatraemia: may cause cerebral oedema.
• Allergic reactions: rash, pruritus, or anaphylaxis.
• Cardiac arrhythmias: irregular heart rhythm linked to electrolyte shifts.

Desmopressin requires careful monitoring of fluid balance and electrolytes, especially in at‑risk populations.

• Fluid restriction: limit intake to ≤1.5 L/24 h in patients prone to hyponatraemia.
• Electrolyte monitoring: check serum sodium regularly during therapy.
• Cardiovascular disease: use cautiously in patients with heart failure or uncontrolled hypertension.
• Pregnancy and lactation: evaluate risk‑benefit, as safety data are limited.
• Age considerations: dose adjustments may be needed for elderly patients.
• Store at ambient temperature: keep in original container, protect from moisture and direct sunlight.

Desmopressin can interact with several drug classes, altering its efficacy or safety profile.

Major Interactions (Avoid)

• NSAIDs: increase risk of hyponatraemia and renal impairment.
• Antifreeze (vasopressin antagonists): negate desmopressin’s antidiuretic effect.
• Carbamazepine: may enhance hyponatraemia risk.

Moderate Interactions (Monitor Closely)

• Diuretics (especially thiazides): potentiate water retention and hyponatraemia.
• Selective serotonin reuptake inhibitors (SSRIs): modestly raise hyponatraemia risk.
• Hormonal contraceptives: may affect fluid balance, requiring closer observation.