This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Kidney, Subject name: Pharmacology
Drug not used in SIADH is: 
Select and explain. 
A. Demeclocycline, B. Desmopressin, C. Restriction of free water intake, D. 3% NaCl
B: Desmopressin
Answer: B: Desmopressin 
Explanation: Desmopressin is ADH and will exacerbates the symptoms of SIADH. Hypeonic saline (3%NaCl) is used for severely symptomatic patients with hyponatremia. Demeclocycline decreases the release of ADH.