Desmopressin acetate injection can cause hyponatremia. Severe hyponatremia can be life-threatening if it is not promptly diagnosed and treated, leading to seizures, coma, respiratory arrest, or death [see Boxed Warning].
Desmopressin acetate injection is contraindicated in patients with hyponatremia (or a history of hyponatremia), with excessive fluid intake (e.g., polydipsia), using loop diuretics or systemic or inhaled glucocorticoids, with known or suspected SIADH, and/or illnesses that can cause fluid or electrolyte imbalances [see Contraindications (4), Drug Interactions (7)]. Avoid concomitant treatments that also cause hyponatremia.
Prior to starting or resuming desmopressin acetate injection, ensure that the serum sodium concentration is normal. Limit fluid intake to a minimum from 1 hour before administration until 8 hours after administration. Use of desmopressin acetate injection without concomitant reduction of fluid intake may lead to fluid retention and hyponatremia.
Monitor the serum sodium concentration within 1 week and approximately 1 month of initiating desmopressin acetate injection, and periodically thereafter [see Dosage and Administration (2.1)]. Base the frequency of serum sodium monitoring on the patient’s risk of hyponatremia.
Patients with conditions associated with fluid and electrolyte imbalance (i.e., cystic fibrosis, heart failure, and renal disorders), geriatric and pediatric patients, patients receiving concomitant treatments that also cause hyponatremia (i.e., tricyclic antidepressants, selective serotonin reuptake inhibitors, nonsteroidal anti-inflammatory drugs, chlorpromazine, opiate analgesics, carbamazepine, lamotrigine, thiazide diuretics and chlorpropamide), and patients with habitual or psychogenic polydipsia who may drink excessive amounts of water, may be at increased risk of hyponatremia [see Contraindications (4)].
If hyponatremia occurs, desmopressin acetate injection may need to be temporarily or permanently discontinued and treatment for the hyponatremia instituted, depending on the clinical circumstances, including the duration and severity of the hyponatremia.