A 72-year-old woman with chronic hyponatremia (serum sodium 128 mEq/L) due to SIADH from idiopathic pulmonary fibrosis is asymptomatic. She has been on fluid restriction (800 mL/day) for 6 months but remains hyponatremic. What is the drug of choice for chronic symptomatic SIADH refractory to fluid restriction?

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