Medicine Endocrinology c90d9882 Which drug is not used in SIADH - A Fludrocoisone B Demeclocycline C Desmopressin D Hypeonic saline High-Yield Explanation demeclocycline inhibit vasopression action in renal distal tubule.severe hyponatremia require treatment with hypeonic saline and fludrocoisone ( Harrison 17 pg 620)