Syndrome of inappropriate antidiuretic hormone secretion (SIADH)?,”The syndrome of SIADH is a common complication of lung cancer, particularly small cell lung cancer. The initial treatment of choice is fluid restriction to allow for serum sodium concentration to gradually rise. Severe symptomatic or resistant hyponatremia from SIADH requires administration of hypertonic saline. Demeclocycline
which acts to oppose ADH in the kidney is rarely necessary.”