Desmopressin and Vasopressin in a clinical pharmacist–oriented table:
| Feature | Desmopressin (DDAVP) | Vasopressin (ADH, Arginine Vasopressin) |
|---|---|---|
| Type | Synthetic analogue of vasopressin | Endogenous antidiuretic hormone (synthetic forms also used) |
| Receptor Selectivity | Mainly V2 receptor agonist (renal collecting ducts → ↑ water reabsorption; endothelial cells → ↑ vWF & factor VIII release) | Acts on V1 receptors (vascular smooth muscle → vasoconstriction) and V2 receptors (renal collecting ducts → antidiuretic effect) |
| Main Clinical Uses | – Central diabetes insipidus (DI) – Nocturnal enuresis – Hemophilia A & von Willebrand disease (type 1) – Diagnostic test for DI |
– Vasodilatory shock (esp. septic shock, refractory shock) – Esophageal variceal bleeding – Central DI (less preferred due to short half-life & more side effects) |
| Hemodynamic Effect | Minimal vasoconstriction (little/no V1 activity) → safe for most CV patients | Potent vasoconstrictor (↑ SVR, ↑ BP) |
| Effect on Coagulation | ↑ von Willebrand factor & Factor VIII → useful in mild bleeding disorders | No significant effect on coagulation factors |
| Half-Life | Longer: ~1.5–2.5 hours (up to 8–20 hrs depending on route) | Short: 10–20 minutes |
| Routes of Administration | Oral, intranasal, subcutaneous, IV | IV, IM, subcutaneous |
| Adverse Effects | – Water intoxication, hyponatremia – Headache, flushing, nasal congestion (intranasal) – Rare: thrombotic events |
– Vasoconstriction complications (ischemia, angina, MI) – Hyponatremia – GI cramps, abdominal pain – Arrhythmias |
| Contraindications | – Hyponatremia – Moderate to severe renal impairment (CrCl <50 mL/min) – History of SIADH |
– Coronary artery disease, ischemic heart disease – Chronic renal failure with volume overload – Asthma (risk of bronchoconstriction) |
| Monitoring | – Serum sodium (risk of hyponatremia) – Fluid balance |
– BP, HR, ECG – Signs of ischemia – Serum sodium |
| Brand Names | DDAVP, Minirin, Stimate | Pitressin (older brand) |
Key Takeaway for Pharmacists:
- Desmopressin = antidiuretic + hemostatic effects, safe for chronic use.
- Vasopressin = potent vasoconstrictor, short-acting, reserved for acute/emergency use (shock, bleeding).