Increased renal Na & lithium clearance. Decreased lithium levels. May increase the risk of Na & fluid retention w/ corticosteroids. Increased vasopressin effect, leading to reduced renal electrolyte free water excretion & may increase the risk of hyponatremia w/ drugs stimulating vasopressin release eg, chlorpropamide, clofibrate, carbamazepine, vincristine, SSRIs, 3,4-methylenedioxy-N-methamphetamine, ifosfamide, antipsychotics, opioids; drugs potentiating vasopressin action eg, chlorpropamide, NSAIDs, cyclophosphamide; vasopressin analogues eg, desmopressin, oxytocin, vasopressin, terlipressin. May increase the risk of hyponatremia w/ diuretics & antiepileptics (eg, oxcarbazepine).